Toyota RAV4 The 61 Most Common DTC Codes

Toyota RAV4 The 61 Most Common DTC Codes

Discover the most common DTC codes for your Toyota RAV4 and get quick information on their symptoms, causes, and fixes. Stay ahead of any potential problems and ensure your vehicle runs smoothly.

DTC P0420

Description: Catalyst System Efficiency Below Threshold (Bank 1)
Symptoms: Poor vehicle performance, reduced fuel efficiency, a strong smell of fuel
Cause: Damaged catalytic converter, oxygen sensor malfunction, exhaust leak, fuel mixture issues
Possible Location: Catalytic converter (Bank 1), oxygen sensors (pre and post-cat)
How to Fix the Problem: Replace the catalytic converter or oxygen sensor, fix exhaust leaks, or address fuel mixture issues
How Difficult to Fix: Moderate
Can You Drive With This Code: Yes, but it may cause damage over time and increase emissions
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, voltmeter (for oxygen sensor testing)

DTC P0441

Description: Evaporative Emission Control System Incorrect Purge Flow
Symptoms: Check engine light, difficulty starting, poor fuel efficiency
Cause: Damaged purge valve, clogged or damaged vapor canister, leaking vacuum hoses
Possible Location: Purge valve, vapor canister, vacuum hoses
How to Fix the Problem: Replace or clean the purge valve, vapor canister, or vacuum hoses
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Yes, but fuel efficiency may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, vacuum gauge (for vacuum hose testing)

DTC P0138

Description: Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2)
Symptoms: Poor vehicle performance, reduced fuel efficiency, check engine light
Cause: Faulty oxygen sensor, damaged wiring or connectors, faulty engine control module (ECM)
Possible Location: Oxygen sensor (Bank 1, Sensor 2), wiring, connectors, ECM
How to Fix the Problem: Replace the oxygen sensor, repair wiring or connectors, or replace the ECM
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Yes, but fuel efficiency may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, voltmeter (for oxygen sensor testing)

DTC P0171

Description: System Too Lean (Bank 1)
Symptoms: Rough idle, stalling, hesitation, check engine light
Cause: Vacuum leaks, dirty mass air flow (MAF) sensor, faulty oxygen sensor, low fuel pressure
Possible Location: Vacuum hoses, intake manifold gasket, MAF sensor, oxygen sensor, fuel injectors
How to Fix the Problem: Repair vacuum leaks, clean or replace the MAF sensor, replace the oxygen sensor, address fuel pressure issues
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Yes, but performance and efficiency may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, vacuum gauge, voltmeter (for oxygen sensor testing)

DTC P0455

Description: Evaporative Emission Control System Leak Detected (Gross Leak)
Symptoms: Check engine light, fuel odor, difficulty starting
Cause: Loose or damaged fuel cap, damaged vapor canister, leaking hoses, faulty purge valve
Possible Location: Fuel cap, vapor canister, hoses, purge valve
How to Fix the Problem: Tighten or replace the fuel cap, replace the vapor canister, repair or replace hoses, replace the purge valve
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Yes, butfuel efficiency may be affected, and the vehicle may not pass emissions testing
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, smoke machine (for leak detection)

DTC P0607

Description: Control Module Performance
Symptoms: Check engine light, poor vehicle performance, stalling, transmission issues
Cause: Faulty engine control module (ECM), low battery voltage, damaged wiring or connectors
Possible Location: ECM, battery, wiring, connectors
How to Fix the Problem: Replace the ECM, charge or replace the battery, repair wiring or connectors
How Difficult to Fix: Moderate to Difficult
Can You Drive With This Code: It is not recommended, as it may cause poor vehicle performance and potential damage to other components
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, voltmeter (for battery testing)

DTC P0456

Description: Evaporative Emission Control System Leak Detected (Very Small Leak)
Symptoms: Check engine light, fuel odor
Cause: Loose or damaged fuel cap, damaged vapor canister, small leaks in hoses or connections, faulty purge valve
Possible Location: Fuel cap, vapor canister, hoses, connections, purge valve
How to Fix the Problem: Tighten or replace the fuel cap, replace the vapor canister, repair or replace hoses and connections, replace the purge valve
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Yes, but fuel efficiency may be affected, and the vehicle may not pass emissions testing
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, smoke machine (for leak detection)

DTC P043E

Description: Evaporative Emission System Reference Orifice Clog Up
Symptoms: Check engine light, fuel odor, difficulty starting
Cause: Blocked or damaged vapor canister, damaged hoses, faulty purge valve
Possible Location: Vapor canister, hoses, purge valve
How to Fix the Problem: Replace the vapor canister, repair or replace hoses, replace the purge valve
How Difficult to Fix: Moderate
Can You Drive With This Code: Yes, but fuel efficiency may be affected, and the vehicle may not pass emissions testing
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench

DTC P1604

Description: Startability Malfunction
Symptoms: Check engine light, difficulty starting, stalling, poor engine performance
Cause: Faulty starter, low battery voltage, damaged wiring or connectors, issues with the immobilizer system
Possible Location: Starter, battery, wiring, connectors, immobilizer system
How to Fix the Problem: Replace or repair the starter, charge or replace the battery, repair wiring or connectors, address immobilizer system issues
How Difficult to Fix: Moderate
Can You Drive With This Code: It may be difficult to start and drive the vehicle
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, voltmeter (for battery testing)

DTC P1135

Description: Air-Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
Symptoms: Check engine light, poor vehicle performance, reduced fuel efficiency
Cause: Faulty air-fuel ratio sensor, damaged wiring or connectors, faulty engine control module (ECM)
PossibleLocation: Air-fuel ratio sensor (Bank 1 Sensor 1), wiring, connectors, ECM
How to Fix the Problem: Replace the air-fuel ratio sensor, repair wiring or connectors, or replace the ECM
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Yes, but fuel efficiency may be affected and emissions may be increased
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, voltmeter (for sensor testing)

DTC P1155

Description: Air-Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
Symptoms: Check engine light, poor vehicle performance, reduced fuel efficiency
Cause: Faulty air-fuel ratio sensor, damaged wiring or connectors, faulty engine control module (ECM)
Possible Location: Air-fuel ratio sensor (Bank 1 Sensor 2), wiring, connectors, ECM
How to Fix the Problem: Replace the air-fuel ratio sensor, repair wiring or connectors, or replace the ECM
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Yes, but fuel efficiency may be affected and emissions may be increased
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, voltmeter (for sensor testing)

DTC P1578

Description: Brake System Malfunction
Symptoms: Check engine light, reduced braking performance, ABS warning light
Cause: Faulty brake booster, brake master cylinder issues, damaged wiring or connectors
Possible Location: Brake booster, brake master cylinder, wiring, connectors
How to Fix the Problem: Replace or repair the brake booster, address brake master cylinder issues, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: It is not recommended, as it may affect braking performance and safety
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, brake fluid tester (for master cylinder testing)

DTC P1271

Description: Accelerator Pedal Position Sensor Range/Performance Problem
Symptoms: Check engine light, poor vehicle performance, hesitation, stalling
Cause: Faulty accelerator pedal position (APP) sensor, damaged wiring or connectors, faulty engine control module (ECM)
Possible Location: APP sensor, wiring, connectors, ECM
How to Fix the Problem: Replace the APP sensor, repair wiring or connectors, or replace the ECM
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: It may be difficult to drive the vehicle, as acceleration and performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, voltmeter (for sensor testing)

DTC P1251

Description: Turbocharger Wastegate Solenoid Valve Malfunction (Diesel)
Symptoms: Check engine light, poor engine performance, turbo lag, reduced power, black smoke from the exhaust
Cause: Faulty wastegate solenoid valve, damaged wiring or connectors, vacuum leaks, faulty turbocharger
Possible Location: Turbocharger wastegate solenoid valve, wiring, connectors, vacuum lines, turbocharger
How to Fix the Problem: Replace the wastegate solenoid valve, repair wiring or connectors, fix vacuum leaks, or repair or replace the turbocharger
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but performance may be significantly reduced
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, vacuum gauge (for vacuum leak testing)

DTC P1589

Description: Throttle Body Calibration
Symptoms: Check engine light, poor throttle response, engine stalling, rough idle
Cause: Dirty or damaged throttle body, faulty throttle position sensor, damaged wiring or connectors
Possible Location: Throttle body, throttle position sensor, wiring, connectors
How to Fix the Problem: Clean or replace the throttle body, replace the throttle position sensor, repair wiring or connectors
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Driving is possible, but performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, throttle body cleaner

DTC P1305

Description: Igniter Circuit Malfunction No. 2 (Cylinder 2)
Symptoms: Check engine light, engine misfire, poor performance, rough idle
Cause: Faulty ignition coil, damaged wiring or connectors, faulty spark plug
Possible Location: Ignition coil (cylinder 2), wiring, connectors, spark plug
How to Fix the Problem: Replace the ignition coil, repair wiring or connectors, or replace the spark plug
How Difficult to Fix: Easy
Can You Drive With This Code: Driving is possible, but engine performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, spark plug socket

DTC P1310

Description: Igniter Circuit Malfunction No. 3 (Cylinder 3)
Symptoms: Check engine light, engine misfire, poor performance, rough idle
Cause: Faulty ignition coil, damaged wiring or connectors, faulty spark plug
Possible Location: Ignition coil (cylinder 3), wiring, connectors, spark plug
How to Fix the Problem: Replace the ignition coil, repair wiring or connectors, or replace the spark plug
How Difficult to Fix: Easy
Can You Drive With This Code: Driving is possible, but engine performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, spark plug socket

DTC P1315

Description: Igniter Circuit Malfunction No. 4 (Cylinder 4)
Symptoms: Check engine light, engine misfire, poor performance, rough idle
Cause: Faulty ignition coil, damaged wiring or connectors, faulty spark plug
Possible Location: Ignition coil (cylinder 4), wiring, connectors, spark plug
How to Fix the Problem: Replace the ignition coil, repair wiring or connectors, or replace the spark plug
How Difficult to Fix: Easy
Can You Drive With This Code: Driving is possible, but engine performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, spark plug socket

DTC P1300

Description: Igniter Circuit Malfunction No. 1 (Cylinder 1)
Symptoms: Check engine light, engine misfire, poor performance, rough idle
Cause: Faulty ignition coil, damaged wiring or connectors, faulty spark plug
Possible Location: Ignition coil (cylinder 1), wiring, connectors, spark plug
How to Fix the Problem: Replace the ignition coil, repair wiring or connectors, or replace the spark plug
How Difficult to Fix: Easy
Can You Drive With This Code: Driving is possible, but engine performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, spark plug socket

DTC P1603

Description: Engine Stall History
Symptoms: Check engine light, engine stalling, rough idle, poor performance
Cause: Various issues, such as faulty sensors, ignition system issues, or fuel system problems
Possible Location: Multiple potential locations, depending on the root cause
How to Fix the Problem: Diagnose the specific issue(s) causing the engine to stall and address them accordingly
How Difficult to Fix: Varies depending on the root cause
Can You Drive With This Code: Driving is possible, but engine performance may be affected, and stalling can be dangerous
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, diagnostic tools depending on the root cause (e.g., fuel pressure gauge, voltmeter)

DTC P2238:

Description: P2238 is a diagnostic trouble code (DTC) that indicates a problem with the upstream oxygen sensor signal in bank 1, sensor 2.
Symptoms: Depending on the severity of the issue, there may be no noticeable symptoms, or the vehicle may experience a decrease in fuel efficiency, rough idling, or stalling.
Cause: The cause of the P2238 code can be a result of a failing oxygen sensor, a damaged wiring harness, a malfunctioning fuel injector, or an issue with the engine management system.
Possible Location: The upstream oxygen sensor in bank 1, sensor 2 is located in the exhaust system before the catalytic converter.
How to Fix the Problem: To repair the issue, the root cause of the problem must be identified and fixed. This may involve replacing the oxygen sensor, repairing or replacing the wiring harness, fixing a fuel injector, or updating the engine management system software.
How Difficult to Fix: The difficulty of fixing the problem can vary depending on the cause of the issue, but in general, replacing an oxygen sensor is a relatively straightforward repair that can be done with basic tools.
Can You Drive With This Code: It is not recommended to drive with a P2238 code, as it can cause damage to the catalytic converter and increase emissions.
How to Clear the Code: The code can be cleared with an OBD-II scanner.
Tools Needed to Use: An OBD-II scanner is needed to clear the code and diagnose the problem.

DTC P2118

Description: Throttle Actuator Control Motor Current Range/Performance
Symptoms: Check engine light, reduced engine power, poor acceleration, limp mode
Cause: Faulty throttle actuator control motor, damaged wiring or connectors, faulty throttle body
Possible Location: Throttle actuator control motor, wiring, connectors, throttle body
How to Fix the Problem: Replace the throttle actuator control motor, repair wiring or connectors, or replace the throttle body
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but performance will be significantly reduced
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench

DTC P2401

Description: Evaporative Emission System Leak Detection Pump Control Circuit Low
Symptoms: Check engine light, possible fuel odor
Cause: Faulty leak detection pump, damaged wiring or connectors, damaged or leaking evaporative emission system components
Possible Location: Leak detection pump, wiring, connectors, evaporative emission system components
How to Fix the Problem: Replace the leak detection pump, repair wiring or connectors, or replace damaged evaporative emission system components
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but emissions will be increased
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench

DTC P2195

Description: Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1, Sensor 1)
Symptoms: Check engine light, poor fuel economy, rough idle, poor engine performance
Cause: Faulty oxygen sensor, vacuum leaks, damaged wiring or connectors, faulty fuel injector, faulty ECU
Possible Location: Oxygen sensor (bank 1, sensor 1), wiring, connectors, vacuum lines, fuel injector, ECU
How to Fix the Problem: Replace the oxygen sensor, repair vacuum leaks, repair wiring or connectors, replace fuel injector, or replace ECU
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Driving is possible, but performance and fuel economy may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, vacuum gauge (for vacuum leak testing)

DTC P2002

Description: Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
Symptoms: Check engine light, poor fuel economy, reduced engine power, black smoke from exhaust
Cause: Clogged diesel particulate filter, faulty pressure sensor, damaged wiring or connectors
Possible Location: Diesel particulate filter, pressure sensor, wiring, connectors
How to Fix the Problem: Clean or replace the diesel particulate filter, replace the pressure sensor, repair wiring or connectors
How Difficult to Fix: Moderate to Difficult
Can You Drive With This Code: Driving is possible, but performance and fuel economy will be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, pressure sensor replacement tool (if applicable)

DTC P2770

Description: Torque Converter Clutch Solenoid Circuit High
Symptoms: Check engine light, decreased fuel economy, torque converter clutch not engaging, shuddering or slipping transmission
Cause: Faulty torque converter clutch solenoid, damaged wiring or connectors, low or dirty transmission fluid, faulty transmission control module (TCM)
Possible Location: Torque converter clutch solenoid, wiring, connectors, transmission fluid, TCM
How to Fix the Problem: Replace the torque converter clutch solenoid, repair wiring or connectors, change or top up transmission fluid, replace the TCM
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but fuel economy and transmission performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, transmission fluid (if applicable)

DTC P2647

Description: VTEC Oil Pressure Switch Circuit High Voltage (Honda-specific code)
Symptoms: Check engine light, poor engine performance, loss of power, engine stalling
Cause: Low engine oil level, dirty engine oil, faulty VTEC oil pressure switch, damaged wiring or connectors
Possible Location: Engine oil level, VTEC oil pressure switch, wiring, connectors
How to Fix the Problem: Check and adjust engine oil level, change dirty engine oil, replace the VTEC oil pressure switch, repair wiring or connectors
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Driving is possible, but engine performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, engine oil (if applicable)

DTC P219A

Description: Air-Fuel Ratio Imbalance (Bank 1)
Symptoms: Check engine light, poor fuel economy, rough idle, poor engine performance
Cause: Faulty oxygen sensor, fuel injector problems, vacuum leaks, ignition system issues
Possible Location: Oxygen sensor, fuel injectors, vacuum lines, ignition system components
How to Fix the Problem: Replace the oxygen sensor, clean or replace fuel injectors, repair vacuum leaks, address ignition system issues
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Driving is possible, but performance and fuel economy may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, vacuum gauge (for vacuum leak testing), fuel injector cleaner (if applicable)

P2681
Description: Engine Coolant Bypass Valve Control Circuit/Open
Symptoms: Check engine light, potential engine overheating, poor fuel economy
Cause: Faulty engine coolant bypass valve, damaged wiring or connectors
Possible Location: Engine coolant bypass valve, wiring, connectors
How to Fix the Problem: Replace the engine coolant bypass valve, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but engine temperature should be monitored closely
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench

DTC P2009

Description: Intake Manifold Runner Control Circuit Low (Bank 1)
Symptoms: Check engine light, poor engine performance, rough idle
Cause: Faulty intake manifold runner control solenoid, damaged wiring or connectors, vacuum leaks
Possible Location: Intake manifold runner control solenoid, wiring, connectors, vacuum lines
How to Fix the Problem: Replace the intake manifold runner control solenoid, repair wiring or connectors, repair vacuum leaks
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Driving is possible, but engine performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, vacuum gauge (for vacuum leak testing)

DTC B0101

Description: Airbag Deployment Control Circuit (Driver Frontal Deployment Loop)
Symptoms: Airbag warning light, possible airbag deployment failure
Cause: Faulty airbag module, damaged wiring or connectors, faulty clock spring
Possible Location: Airbag module, wiring, connectors, clock spring
How to Fix the Problem: Replace the airbag module, repair wiring or connectors, replace the clock spring
How Difficult to Fix: Moderate to Difficult
Can You Drive With This Code: Driving is possible, but there is a risk of airbag deployment failure in an accident
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, airbag module replacement tool (if applicable)

DTC B1650

Description: Occupant Classification System Malfunction
Symptoms: Airbag warning light, possible airbag deployment failure for the passenger seat
Cause: Faulty occupant classification sensor, damaged wiring or connectors, malfunction in the occupant classification system
Possible Location: Occupant classification sensor, wiring, connectors
How to Fix the Problem: Replace the occupant classification sensor, repair wiring or connectors, diagnose and repair the occupant classification system
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but there is a risk of airbag deployment failure for the passenger seat in an accident
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, occupant classification sensor replacement tool (if applicable)

DTC B1794

Description: Open in Occupant Classification ECU Battery Positive Line
Symptoms: Airbag warning light, possible airbag deployment failure for the passenger seat
Cause: Damaged wiring or connectors, faulty occupant classification ECU
Possible Location: Wiring, connectors, occupant classification ECU
How to Fix the Problem: Repair wiring or connectors, replace the occupant classification ECU
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but there is a risk of airbag deployment failure for the passenger seat in an accident
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, occupant classification ECU replacement tool (if applicable)

DTC B1801

Description: Open in D Squib Circuit (Driver-Side Airbag)
Symptoms: Airbag warning light, possible driver-side airbag deployment failure
Cause: Faulty driver-side airbag module, damaged wiring or connectors, faulty clock spring
Possible Location: Driver-side airbag module, wiring, connectors, clock spring
How to Fix the Problem: Replace the driver-side airbag module, repair wiring or connectors, replace the clock spring
How Difficult to Fix: Moderate to Difficult
Can You Drive With This Code: Driving is possible, but there is a risk of driver-side airbag deployment failure in an accident
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, airbag module replacement tool (if applicable)

DTC B1421

Description: Solar Sensor Circuit (Passenger Side)
Symptoms: Reduced efficiency of climate control system, possible uneven cabin temperature
Cause: Faulty solar sensor, damaged wiring or connectors
Possible Location: Passenger-side solar sensor, wiring, connectors
How to Fix the Problem: Replace the passenger-side solar sensor, repair wiring or connectors
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Driving is possible, but climate control system efficiency may be reduced
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, solar sensor replacement tool (if applicable)

DTC B1479

Description: Solar Sensor Circuit (Driver Side)
Symptoms: Reduced efficiency of climate control system, possible uneven cabin temperature
Cause: Faulty solar sensor, damaged wiring or connectors
Possible Location: Driver-side solar sensor, wiring, connectors
How to Fix the Problem: Replace the driver-side solar sensor, repair wiring or connectors
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Driving is possible, but climate control system efficiency may be reduced
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, solar sensor replacement tool (if applicable)

DTC B1247

Description: Panel Solar Sensor Circuit
Symptoms: Reduced efficiency of climate control system, possible uneven cabin temperature
Cause: Faulty panel solar sensor, damaged wiring or connectors
Possible Location: Panel solar sensor, wiring, connectors
How to Fix the Problem: Replace the panel solar sensor, repair wiring or connectors
How Difficult to Fix: Easy to Moderate
Can You Drive With This Code: Driving is possible, but climate control system efficiency may be reduced
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, solar sensor replacement tool (if applicable)

DTC B2799

Description: Engine Immobilizer System Malfunction
Symptoms: Engine may not start, security indicator light may flash
Cause: Faulty immobilizer system components, damaged wiring or connectors, unprogrammed or damaged key
Possible Location: Immobilizer system components, wiring, connectors, key
How to Fix the Problem: Diagnose and repair immobilizer system components, repair wiring or connectors, reprogram or replace key
How Difficult to Fix: Moderate to Difficult
Can You Drive With This Code: Not possible if the engine does not start
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, immobilizer system diagnostic tool (if applicable)

DTC B279A

Description: Communication Malfunction No. 1
Symptoms: Possible loss of communication between various control modules
Cause: Faulty control module(s), damaged wiring or connectors
Possible Location: Control module(s), wiring, connectors
How to Fix the Problem: Diagnose and repair faulty control module(s), repair wiring or connectors
How Difficult to Fix: Moderate to Difficult
Can You Drive With This Code: Driving is possible, but vehicle performance may be affected
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, control module diagnostic tool (if applicable)

DTC B2796

Description: No Communication in Immobilizer System
Symptoms: Engine may not start, security indicator light may flash
Cause: Faulty immobilizer system components, damaged wiring or connectors, unprogrammed or damaged key
Possible Location: Immobilizer system components, wiring, connectors, key
How to Fix the Problem: Diagnose and repair immobilizer system components, repair wiring or connectors, reprogram or replace key
How Difficult to Fix: Moderate to Difficult
Can You Drive With This Code: Not possible if the engine does not start
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, immobilizer system diagnostic tool (if applicable)

DTC B2220

Description: Front Airbag Sensor LH Circuit Malfunction
Symptoms: Airbag warning light, possible failure of front airbag deployment on the driver’s side
Cause: Faulty front airbag sensor, damaged wiring or connectors
Possible Location: Front airbag sensor (driver’s side), wiring, connectors
How to Fix the Problem: Replace the front airbag sensor, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but there is a risk of driver-side airbag deployment failure in an accident
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, airbag sensor replacement tool (if applicable)

DTC B2784

Description: Antenna Coil Open/Short
Symptoms: Engine may not start, security indicator light may flash
Cause: Faulty antenna coil, damaged wiring or connectors
Possible Location: Antenna coil, wiring, connectors
How to Fix the Problem: Replace the antenna coil, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Not possible if the engine does not start
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, antenna coil replacement tool (if applicable)

DTC B2226

Description: Occupant Classification System Malfunction
Symptoms: Airbag warning light, possible airbag deployment failure for the passenger seat
Cause: Faulty occupant classification system, damaged wiring or connectors
Possible Location: Occupant classification system components, wiring, connectors
How to Fix the Problem: Diagnose and repair occupant classification system, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but there is a risk of airbag deployment failure for the passenger seat in an accident
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, occupant classification system diagnostic tool (if applicable)

DTC B2312

Description: Short to Ground in Outer Mirror Indicator LH
Symptoms: Driver’s side outer mirror indicator may not function
Cause: Short circuit in wiring, damaged wiring or connectors, faulty mirror indicator
Possible Location: Outer mirror indicator (driver’s side), wiring, connectors
How to Fix the Problem: Repair wiring or connectors, replace the mirror indicator
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the mirror indicator may not function
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, mirror indicator replacement tool (if applicable)

DTC B2780

Description: Steering Lock Position Signal Circuit Malfunction
Symptoms: Steering may not lock or unlock, ignition key may not turn, vehicle may not start
Cause: Faulty steering lock position sensor, damaged wiring or connectors
Possible Location: Steering lock position sensor, wiring, connectors
How to Fix the Problem: Replace the steering lock position sensor, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Not possible if the steering is locked or the vehicle cannot start
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, steering lock position sensor replacement tool (if applicable)

DTC C1280

Description: Lateral Acceleration Sensor Circuit Malfunction
Symptoms: Stability control system may not function properly, traction control warning light may illuminate
Cause: Faulty lateral acceleration sensor, damaged wiring or connectors
Possible Location: Lateral acceleration sensor, wiring, connectors
How to Fix the Problem: Replace the lateral acceleration sensor, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the stability control system may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, lateral acceleration sensor replacement tool (if applicable)

DTC C1201

Description: Engine Control System Malfunction
Symptoms: Poor engine performance, engine stalling, check engine light, and/or traction control light may illuminate
Cause: Various engine control system issues
Possible Location: Engine control system components, wiring, connectors
How to Fix the Problem: Diagnose and repair engine control system components, repair wiring or connectors
How Difficult to Fix: Moderate to Difficult
Can You Drive With This Code: Driving is possible, but performance issues may be present
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, engine control system diagnostic tool (if applicable)

DTC C1241

Description: Low Battery Positive Voltage or Abnormally High Battery Positive Voltage
Symptoms: ABS warning light, possible ABS system malfunction
Cause: Low or high battery voltage, faulty charging system, damaged wiring or connectors
Possible Location: Battery, charging system, wiring, connectors
How to Fix the Problem: Check and repair the charging system, replace the battery if necessary, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the ABS system may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, battery and charging system tester (if applicable)

DTC C1223

Description: ABS Control System Malfunction
Symptoms: ABS warning light, possible ABS system malfunction
Cause: Faulty ABS control module, damaged wiring or connectors
Possible Location: ABS control module, wiring, connectors
How to Fix the Problem: Replace the ABS control module, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the ABS system may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, ABS control module replacement tool (if applicable)

DTC C1203

Description: ECM Communication Circuit Malfunction
Symptoms: Engine performance issues, check engine light, possible communication issues with other control modules
Cause: Faulty ECM, damaged wiring or connectors
Possible Location: ECM, wiring, connectors
How to Fix the Problem: Replace the ECM, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but performance issues may be present
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, ECM replacement tool (if applicable)

DTC C1249

Description: Brake Light Switch Circuit Malfunction
Symptoms: Brake lights not working, ABS or stability control warning light may illuminate
Cause: Faulty brake light switch, damaged wiring or connectors
Possible Location: Brake light switch, wiring, connectors
How to Fix the Problem: Replace the brake light switch, repair wiring or connectors
How Difficult to Fix: Easy
Can You Drive With This Code: Driving is possible, but brake lights may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, brake light switch replacement tool (if applicable)

DTC C1298

Description: Differential Pressure Sensor Circuit Malfunction
Symptoms: ABS or stability control warning light may illuminate, possible ABS or stability control system malfunction
Cause: Faulty differential pressure sensor, damaged wiring or connectors
Possible Location: Differential pressure sensor, wiring, connectors
How to Fix the Problem: Replace the differential pressure sensor, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the ABS or stability control system may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, differential pressure sensor replacement tool (if applicable)

DTC C2126

Description: Steering Angle Sensor Circuit Malfunction
Symptoms: Traction control or stability control warning light may illuminate, possible traction or stability control system malfunction
Cause: Faulty steering angle sensor, damaged wiring or connectors
Possible Location: Steering angle sensor, wiring, connectors
How to Fix the Problem: Replace the steering angle sensor, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the traction or stability control system may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, steering angle sensor replacement tool (if applicable)

DTC C2122

Description: Tire Pressure Monitoring System (TPMS) Transmitter ID not Received
Symptoms: TPMS warning light may illuminate, possible incorrect tire pressure readings
Cause: Faulty TPMS sensor or transmitter, damaged wiring or connectors
Possible Location: TPMS sensor, wiring, connectors
How to Fix the Problem: Replace the TPMS sensor or transmitter, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but tire pressure readings may be inaccurate
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, TPMS sensor or transmitter replacement tool (if applicable)

DTC C2121

Description: Tire Pressure Monitoring System (TPMS) Sensor Signal Circuit Malfunction
Symptoms: TPMS warning light may illuminate, possible incorrect tire pressure readings
Cause: Faulty TPMS sensor, damaged wiring or connectors
Possible Location: TPMS sensor, wiring, connectors
How to Fix the Problem: Replace the TPMS sensor, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but tire pressure readings may be inaccurate
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, TPMS sensor replacement tool (if applicable)

DTC C2124

Description: Tire Pressure Monitoring System (TPMS) Sensor Signal Range/Performance
Symptoms: TPMS warning light may illuminate, possible incorrect tire pressure readings
Cause: Faulty TPMS sensor, damaged wiring or connectors
Possible Location: TPMS sensor, wiring, connectors
How to Fix the Problem: Replace the TPMS sensor, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but tire pressure readings may be inaccurate
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, TPMS sensor replacement tool (if applicable)

DTC U0105

Description: Lost Communication with Fuel Injector Control Module
Symptoms: Engine performance issues, possible engine stalling, check engine light may illuminate
Cause: Faulty fuel injector control module, damaged wiring or connectors
Possible Location: Fuel injector control module, wiring, connectors
How to Fix the Problem: Replace the fuel injector control module, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but engine performance issues may be present
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, fuel injector control module replacement tool (if applicable)

DTC U0126

Description: Lost Communication with Steering Angle Sensor Module
Symptoms: Traction control or stability control warning light may illuminate, possible traction or stability control system malfunction
Cause: Faulty steering angle sensor module, damaged wiring or connectors
Possible Location: Steering angle sensor module, wiring, connectors
How to Fix the Problem: Replace the steering angle sensor module, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the traction or stability control system may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, steering angle sensor module replacement tool (if applicable)

DTC U0129

Description: Lost Communication with Brake System Control Module
Symptoms: ABS or stability control warning light may illuminate, possible ABS or stability control system malfunction
Cause: Faulty brake system control module, damaged wiring or connectors
Possible Location: Brake system control module, wiring, connectors
How to Fix the Problem: Replace the brake system control module, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the ABS or stability control system may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, brake system control module replacement tool (if applicable)

DTC U0073

Description: Control Module Communication Bus “A” Off
Symptoms: Check engine light may illuminate, various vehicle system malfunctions may occur
Cause: Faulty control module, damaged wiring or connectors, possible CAN bus issue
Possible Location: Control module, wiring, connectors, CAN bus
How to Fix the Problem: Diagnose and replace the faulty control module, repair wiring or connectors, check for issues with the CAN bus
How Difficult to Fix: Difficult
Can You Drive With This Code: Driving is possible, but various systems may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, control module replacement tool (if applicable)

DTC U0100

Description: Lost Communication with Engine Control Module (ECM)
Symptoms: Engine may not start, check engine light may illuminate, various vehicle system malfunctions may occur
Cause: Faulty ECM, damaged wiring or connectors, possible CAN bus issue
Possible Location: ECM, wiring, connectors, CAN bus
How to Fix the Problem: Diagnose and replace the faulty ECM, repair wiring or connectors, check for issues with the CAN bus
How Difficult to Fix: Difficult
Can You Drive With This Code: Driving may not be possible if the engine does not start
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, ECM replacement tool (if applicable)

DTC U0235

Description: Lost Communication with Yaw Rate Sensor Module
Symptoms: Traction control or stability control warning light may illuminate, possible traction or stability control system malfunction
Cause: Faulty yaw rate sensor module, damaged wiring or connectors
Possible Location: Yaw rate sensor module, wiring, connectors
How to Fix the Problem: Replace the yaw rate sensor module, repair wiring or connectors
How Difficult to Fix: Moderate
Can You Drive With This Code: Driving is possible, but the traction or stability control system may not function properly
How to Clear the Code: Use an OBD-II scanner or disconnect the battery for a few minutes
Tools Needed: OBD-II scanner, wrench, yaw rate sensor module replacement tool (if applicable)

WORDS FROM ERWIN SALARDA

Stay informed and ahead of potential problems with your Toyota RAV4 by understanding the most common DTC codes. This comprehensive guide covers symptoms, causes, and fixes, so you can stay on top of maintaining your vehicle. Don’t wait until it’s too late, use this guide to take control of your Toyota RAV4’s health.