Toyota Sequoia 18 MOST COMMON OBD DTC Issues

The Toyota Sequoia is a well-known full-size SUV that is known for being reliable and flexible. But like any other car, it can have some common OBD-II DTC problems, such as C1630, P1343, P0430, C1340, C1234, P2442, P2135, P1201, P1251, B1140, B1141, P0171, P0174, P0552, P0553, C1223, C1295, and P1604. To make sure your Toyota Sequoia works well, you need to know about these problems and what causes them.

Toyota Sequoia DTC C1630

Description: DTC C1630 is related to the ABS/TRAC/VSC systems, specifically the Skid Control Motor Relay Circuit Malfunction. This code indicates that there is an issue with the relay that controls the anti-lock braking system (ABS), traction control (TRAC), and vehicle stability control (VSC) in the Toyota Sequoia.

Symptoms:

ABS, TRAC, and/or VSC warning lights on the dashboard
Reduced braking performance
Loss of traction control
Loss of stability control

Cause:

Faulty skid control motor relay
Damaged or corroded wiring or connections
Faulty ABS actuator assembly
Faulty ABS control module

Possible Location:

Skid control motor relay (usually located in the engine compartment or under the dashboard)
ABS actuator assembly
ABS control module

How to Fix the Problem:

Visually inspect the wiring and connections related to the skid control motor relay, ABS actuator assembly, and ABS control module. Repair or replace any damaged or corroded components.
Test the skid control motor relay for proper operation and replace it if necessary.
If the issue persists, the ABS actuator assembly or ABS control module may be faulty and require replacement.

How Difficult to Fix: Moderate – Basic knowledge of vehicle electrical systems and some experience with automotive diagnostics is recommended.

Can You Drive With This Code: It is not recommended to drive with this code, as it can compromise the braking performance and vehicle stability, increasing the risk of an accident.

How to Clear the Code: A professional scan tool or an OBD-II scanner is required to clear the code. Disconnecting the battery will not clear the code, and it may also cause the ECU to reset and relearn, which can lead to poor engine performance and drivability issues.

Tools Needed:

OBD-II scanner or professional scan tool (to read and clear codes)
Multimeter (to test electrical components)
Basic hand tools (for accessing and replacing components)

Toyota Sequoia DTC P1343

Description: DTC P1343 is related to the Variable Valve Timing (VVT) system, specifically the VVT system malfunction (Bank 1). This code indicates that there is an issue with the VVT system on the bank 1 side of the engine.

Symptoms:

Check engine light on
Poor engine performance
Reduced fuel economy
Rough idling or stalling
Engine misfires

Cause:

Faulty VVT solenoid
Clogged VVT oil control valve filter
Stretched or damaged timing chain
Worn camshaft or camshaft phaser
Low engine oil level or poor oil quality

Possible Location:

VVT solenoid (usually located near the front of the engine)
VVT oil control valve filter
Timing chain
Camshaft and camshaft phaser

How to Fix the Problem:

Check the engine oil level and quality. Top up or change the oil if necessary.
Inspect the VVT solenoid for signs of damage or malfunction, and replace it if necessary.
Clean or replace the VVT oil control valve filter.
If the issue persists, inspect the timing chain, camshaft, and camshaft phaser for wear or damage, and replace them as needed.

How Difficult to Fix: Moderate to Difficult – This repair may require advanced knowledge of engine components and special tools to access and replace the parts.

Can You Drive With This Code: Driving with this code can cause engine performance issues and may result in further engine damage. It is not recommended to drive with this code.

Tools Needed:

OBD-II scanner or professional scan tool (to read and clear codes)
Basic hand tools (for accessing and replacing components)
Special tools (e.g., timing chain tool, camshaft locking tool) may be required for timing chain or camshaft-related repairs
Multimeter (to test electrical components)

Toyota Sequoia DTC P0430

Description: DTC P0430 is related to the Catalyst System Efficiency Below Threshold (Bank 2). This code indicates that the catalytic converter on bank 2 of the engine is not performing at its optimal efficiency, potentially due to degradation or a malfunction.

Symptoms:

Check engine light on
Reduced fuel efficiency
Poor engine performance
Unusual exhaust smell

Cause:

Failed or damaged catalytic converter
Exhaust leaks
Faulty oxygen (O2) sensors
Engine misfires
Poor fuel quality or incorrect fuel-to-air ratio

Possible Location:

Catalytic converter (Bank 2)
Exhaust system
Oxygen (O2) sensors (upstream and downstream of the catalytic converter)

How to Fix the Problem:

Check for exhaust leaks and repair them if necessary.
Test the upstream and downstream oxygen (O2) sensors and replace them if they are faulty.
Inspect the engine for misfires or other issues that can affect the fuel-to-air ratio and address them.
If the issue persists, the catalytic converter may be faulty and need replacement.

How Difficult to Fix: Moderate – Basic automotive repair knowledge and tools are required.

Can You Drive With This Code: Driving with this code may cause reduced fuel efficiency and increased emissions. While it is not immediately dangerous, it is not recommended to drive with this code for an extended period.

Tools Needed:

OBD-II scanner or professional scan tool (to read and clear codes)
Basic hand tools (for accessing and replacing components)
Multimeter (to test electrical components)

Toyota Sequoia DTC C1340

Description: DTC C1340 is related to the Vehicle Stability Control (VSC) system, specifically the VSC center differential clutch assembly lock fault. This code indicates that there is a malfunction in the center differential clutch assembly, which is part of the VSC system.

Symptoms:

VSC warning light on
Reduced vehicle stability
Poor handling on slippery or uneven surfaces

Cause:

Faulty center differential clutch assembly
Damaged wiring or connections
Faulty VSC control module

Possible Location:

Center differential clutch assembly (typically located within the transfer case)
VSC control module

How to Fix the Problem:

Inspect the wiring and connections related to the center differential clutch assembly and VSC control module. Repair or replace any damaged components.
Test the center differential clutch assembly for proper operation and replace it if necessary.
If the issue persists, the VSC control module may be faulty and require replacement.

How Difficult to Fix: Difficult – Advanced automotive repair knowledge and special tools may be required.

Can You Drive With This Code: Driving with this code can cause reduced vehicle stability, especially on slippery or uneven surfaces. It is not recommended to drive with this code.

Tools Needed:

OBD-II scanner or professional scan tool (to read and clear codes)
Basic hand tools (for accessing and replacing components)
Special tools (for center differential clutch assembly replacement)

Toyota Sequoia DTC C1234

Description: DTC C1234 is related to the Anti-lock Brake System (ABS), specifically the Left Rear Wheel Speed Sensor Circuit fault. This code indicates that there is an issue with the left rear wheel speed sensor or its circuitry.

Symptoms:

ABS warning light on
Traction control and stability control systems may be affected
Reduced braking performance, especially on slippery surfaces

Cause:

Faulty left rear wheel speed sensor
Damaged or corroded wiring or connectors
Debris or damage on the wheel speed sensor reluctor ring
Faulty ABS control module

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Possible Location:

Left rear wheel speed sensor (located near the left rear wheel hub)
Wiring and connectors related to the wheel speed sensor
ABS control module

How to Fix the Problem:

Visually inspect the left rear wheel speed sensor for damage or debris. Clean or replace the sensor if necessary.
Inspect the wiring and connectors related to the left rear wheel speed sensor. Repair or replace any damaged or corroded components.
Check the reluctor ring for damage or debris and clean or replace it if necessary.
If the issue persists, the ABS control module may be faulty and require replacement.

How Difficult to Fix: Moderate – Basic automotive repair knowledge and tools are required.

Can You Drive With This Code: Driving with this code may cause reduced braking performance and compromised traction and stability control systems. While it is not immediately dangerous, it is not recommended to drive with this code for an extended period.

Tools Needed:

OBD-II scanner or professional scan tool (to read and clear codes)
Basic hand tools (for accessing and replacing components)
Multimeter (to test electrical components)

Toyota Sequoia DTC P2442

Description: DTC P2442 is related to the Secondary Air Injection System Switching Valve Stuck Open Bank 2. This code indicates that there is an issue with the air injection system, specifically the switching valve on bank 2 of the engine.

Symptoms:

Check engine light on
Poor engine performance
Reduced fuel efficiency
Increased emissions

Cause:

Faulty air injection switching valve
Damaged or corroded wiring or connectors
Faulty air injection pump
Vacuum leak

Possible Location:

Air injection switching valve (Bank 2)
Air injection pump
Wiring and connectors related to the air injection system

How to Fix the Problem:

Inspect the wiring and connectors related to the air injection switching valve and air injection pump. Repair or replace any damaged or corroded components.
Test the air injection switching valve for proper operation and replace it if necessary.
Check the air injection pump for proper operation and replace it if needed.
Inspect the system for vacuum leaks and repair them if necessary.

How Difficult to Fix: Moderate – Basic automotive repair knowledge and tools are required.

Can You Drive With This Code: Driving with this code may cause increased emissions and reduced fuel efficiency. While it is not immediately dangerous, it is not recommended to drive with this code for an extended period.

How to Clear the Code: Use an OBD-II scanner or a professional scan tool to clear the code. Disconnecting the battery is not recommended, as it may cause other issues and reset the ECU’s learned settings.

Tools Needed:

OBD-II scanner or professional scan tool
Basic hand tools for repairing or replacing damaged components
Multimeter or electrical tester for checking wiring and connectors

Toyota Sequoia DTC P2135

Description: DTC P2135 is related to the Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation. This code indicates that there is a discrepancy between the throttle position sensor A and B voltage readings.

Symptoms:

Check engine light on
Poor engine performance
Engine hesitation or surging
Reduced fuel efficiency

Cause:

Faulty throttle position sensor
Damaged or corroded wiring or connectors
Faulty accelerator pedal position sensor
Faulty throttle body

Possible Location:

Throttle position sensor (located on the throttle body)
Accelerator pedal position sensor (located on the accelerator pedal)
Wiring and connectors related to the throttle position sensor and accelerator pedal position sensor

How to Fix the Problem:

Inspect the wiring and connectors related to the throttle position sensor and accelerator pedal position sensor. Repair or replace any damaged or corroded components.
Test the throttle position sensor and accelerator pedal position sensor for proper operation and replace them if necessary.
If the issue persists, the throttle body may be faulty and require replacement.

How Difficult to Fix: Moderate – Basic automotive repair knowledge and tools are required.

Can You Drive With This Code: Driving with this code may cause poor engine performance and reduced fuel efficiency. While it is not immediately dangerous, it is not recommended to drive with this code for an extended period.

Tools Needed:

- OBD-II scanner or professional scan tool
- Basic hand tools for repairing or replacing damaged components
- Multimeter or electrical tester for checking wiring and connectors

DTC P1201 is related to Injector Circuit/Open Cylinder 1

Description: . This code indicates that there is an issue with the fuel injector circuit for cylinder 1.

Symptoms:

Check engine light on
Rough engine idle
Poor engine performance
Reduced fuel efficiency
Engine misfires

Cause:

Faulty fuel injector
Damaged or corroded wiring or connectors
Faulty Engine Control Module (ECM)

Possible Location:

Fuel injector for cylinder 1
Wiring and connectors related to the fuel injector
Engine Control Module (ECM)

How to Fix the Problem:

Inspect the wiring and connectors related to the fuel injector for cylinder 1. Repair or replace any damaged or corroded components.
Test the fuel injector for proper operation and replace it if necessary.
If the issue persists, the Engine Control Module (ECM) may be faulty and require replacement.

How Difficult to Fix: Moderate – Basic automotive repair knowledge and tools are required.

Can You Drive With This Code: Driving with this code may cause poor engine performance, rough idle, and reduced fuel efficiency. While it is not immediately dangerous, it is not recommended to drive with this code for an extended period.

Tools Needed:

OBD-II scanner or professional scan tool
Basic hand tools for repairing or replacing damaged components
Multimeter or electrical tester for checking wiring and connectors

Toyota Sequoia DTC P1251

Description: DTC P1251 is related to the Turbocharger System Performance. This code indicates that the engine control module has detected an issue with the performance of the turbocharger or supercharger system.

Symptoms:

Check engine light on
Poor engine performance
Loss of power or acceleration
Turbo lag or reduced boost pressure

Cause:

Faulty boost pressure sensor
Damaged or corroded wiring or connectors
Worn or damaged turbocharger or supercharger
Leaking or damaged intercooler
Vacuum leaks

Possible Location:

Boost pressure sensor
Turbocharger or supercharger
Intercooler
Wiring and connectors related to the turbocharger or supercharger system

How to Fix the Problem:

Inspect the wiring and connectors related to the turbocharger or supercharger system. Repair or replace any damaged or corroded components.
Test the boost pressure sensor for proper operation and replace it if necessary.
Check the turbocharger or supercharger for damage or wear and replace it if needed.
Inspect the intercooler for damage or leaks and repair or replace it if necessary.
Check the system for vacuum leaks and repair them if needed.

How Difficult to Fix: Moderate to Difficult – Basic to advanced automotive repair knowledge and tools may be required, depending on the specific issue.

Can You Drive With This Code: Driving with this code may cause poor engine performance, reduced power, and increased turbo lag. While it is not immediately dangerous, it is not recommended to drive with this code for an extended period.

Tools Needed:

OBD-II scanner or professional scan tool
Basic hand tools for repairing or replacing damaged components
Multimeter or electrical tester for checking wiring and connectors

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Toyota Sequoia DTC B1140

Description: DTC B1140 is related to the Airbag Sensor Assembly Malfunction. This code indicates that there is an issue with the airbag sensor assembly, which may affect the proper deployment of airbags in case of an accident.

Symptoms:

Airbag warning light on
Airbags may not deploy in case of an accident

Cause:

Faulty airbag sensor assembly
Damaged or corroded wiring or connectors
Faulty airbag control module

Possible Location:

Airbag sensor assembly
Wiring and connectors related to the airbag system
Airbag control module

How to Fix the Problem:

Inspect the wiring and connectors related to the airbag system. Repair or replace any damaged or corroded components.
Test the airbag sensor assembly for proper operation and replace it if necessary.
If the issue persists, the airbag control module may be faulty and require replacement.

How Difficult to Fix: Moderate – Basic automotive repair knowledge and tools are required.

Can You Drive With This Code: Driving with this code may put occupants at risk in case of an accident, as the airbags may not deploy properly. It is recommended to address this issue as soon as possible.

Tools Needed:

OBD-II scanner or professional scan tool
Basic hand tools for repairing or replacing damaged components
Multimeter or electrical tester for checking wiring and connectors

Toyota Sequoia DTC B1141

Description: DTC B1141 is related to the Seat Position Airbag Sensor Circuit Malfunction. This code indicates that there is an issue with the seat position airbag sensor circuit, which can affect the proper deployment of airbags in case of an accident.

Symptoms:

Airbag warning light on
Airbags may not deploy according to the seat position in case of an accident

Cause:

Faulty seat position airbag sensor
Damaged or corroded wiring or connectors
Faulty airbag control module

Possible Location:

Seat position airbag sensor
Wiring and connectors related to the seat position airbag sensor
Airbag control module

How to Fix the Problem:

Inspect the wiring and connectors related to the seat position airbag sensor. Repair or replace any damaged or corroded components.
Test the seat position airbag sensor for proper operation and replace it if necessary.
If the issue persists, the airbag control module may be faulty and require replacement.

How Difficult to Fix: Moderate – Basic automotive repair knowledge and tools are required.

Can You Drive With This Code: Driving with this code may put occupants at risk in case of an accident, as the airbags may not deploy according to the seat position. It is recommended to address this issue as soon as possible.

Tools Needed:

OBD-II scanner or professional scan tool
Basic hand tools for repairing or replacing damaged components
Multimeter or electrical tester for checking wiring and connectors

Toyota Sequoia DTC P0171: System Too Lean (Bank 1)

Description: This code indicates that the engine control module (ECM) detects a lean fuel mixture in the engine’s Bank 1, which is the side of the engine containing cylinder 1.

Symptoms:

Poor engine performance
Loss of power or hesitation
Rough idle
Engine stalling
Decreased fuel efficiency
Check engine light illuminated

Cause:

Vacuum leak
Faulty mass airflow (MAF) sensor
Faulty oxygen (O2) sensor
Clogged or dirty fuel injectors
Low fuel pressure due to a failing fuel pump or clogged fuel filter
Intake manifold gasket leak

Possible Location:

Intake manifold
Vacuum lines
MAF sensor
O2 sensor
Fuel injectors
Fuel pump
Fuel filter

How to Fix the Problem:

Perform a visual inspection of the vacuum lines and intake manifold for leaks or damage.
Use an OBD-II scanner to check the readings of the MAF sensor and O2 sensor.
Clean or replace the MAF sensor if necessary.
Inspect the fuel injectors for clogging or damage, and clean or replace them if needed.
Test the fuel pressure and replace the fuel pump or fuel filter if required.
Replace the intake manifold gasket if there’s a leak.

How Difficult to Fix: Moderate difficulty, depending on the specific issue.

Can You Drive With This Code: Yes, but it may lead to poor engine performance, decreased fuel efficiency, and potential engine damage over time.

How to Clear the Code:

Use an OBD-II scanner to clear the code after fixing the issue.
Disconnecting the battery may reset the ECM, but it’s not recommended as it may also reset other important systems in the vehicle.

Tools Needed to Use:

OBD-II scanner: To read and clear DTCs and monitor sensor readings.
Basic hand tools: To inspect and repair vacuum lines, intake manifold, and fuel injectors.
Fuel pressure gauge: To check fuel pressure.
Multimeter: To test electrical components like sensors and wiring.

Toyota Sequoia DTC P0174: System Too Lean (Bank 2)

Description: This code indicates that the engine control module (ECM) detects a lean fuel mixture in the engine’s Bank 2, which is the side of the engine opposite cylinder 1.

Symptoms:

Poor engine performance
Loss of power or hesitation
Rough idle
Engine stalling
Decreased fuel efficiency
Check engine light illuminated

Cause:

Vacuum leak
Faulty mass airflow (MAF) sensor
Faulty oxygen (O2) sensor
Clogged or dirty fuel injectors
Low fuel pressure due to a failing fuel pump or clogged fuel filter
Intake manifold gasket leak

Possible Location:

Intake manifold
Vacuum lines
MAF sensor
O2 sensor
Fuel injectors
Fuel pump
Fuel filter

How to Fix the Problem:

Perform a visual inspection of the vacuum lines and intake manifold for leaks or damage.
Use an OBD-II scanner to check the readings of the MAF sensor and O2 sensor.
Clean or replace the MAF sensor if necessary.
Inspect the fuel injectors for clogging or damage, and clean or replace them if needed.
Test the fuel pressure and replace the fuel pump or fuel filter if required.
Replace the intake manifold gasket if there’s a leak.

How Difficult to Fix: Moderate difficulty, depending on the specific issue.

Can You Drive With This Code: Yes, but it may lead to poor engine performance, decreased fuel efficiency, and potential engine damage over time.

How to Clear the Code:

Use an OBD-II scanner to clear the code after fixing the issue.
Disconnecting the battery may reset the ECM, but it’s not recommended as it may also reset other important systems in the vehicle.

Tools Needed to Use:

OBD-II scanner: To read and clear DTCs and monitor sensor readings.
Basic hand tools: To inspect and repair vacuum lines, intake manifold, and fuel injectors.
Fuel pressure gauge: To check fuel pressure.
Multimeter: To test electrical components like sensors and wiring.

Toyota Sequoia DTC P0552: Power Steering Pressure Sensor Circuit Low Input

Description: This code indicates that the ECM has detected a low input signal from the power steering pressure sensor, which measures the hydraulic pressure in the power steering system.

Symptoms:

Heavy steering feel
Poor steering response
Power steering fluid leak
Check engine light or power steering warning light illuminated

Cause:

Faulty power steering pressure sensor
Damaged or corroded wiring or connectors
Power steering fluid leak
Faulty power steering pump

Possible Location:

Power steering pressure sensor
Power steering pump
Power steering hoses and lines
Wiring and connectors

How to Fix the Problem:

Inspect the power steering pressure sensor and its wiring for damage or corrosion.
Test the power steering pressure sensor using a multimeter and replace it if necessary.
Check the power steering fluid level and top off if needed.
Inspect the power steering hoses and lines for leaks and replace if necessary.
Test the power steering pump for proper operation and replace if required.

How Difficult to Fix: Moderate difficulty, depending on the specific issue.

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Can You Drive With This Code: Yes, but driving with a malfunctioning power steering system can be difficult and may lead to reduced vehicle control and safety concerns.

How to Clear the Code:

Use an OBD-II scanner to clear the code after fixing the issue.
Disconnecting the battery may reset the ECM, but it’s not recommended as it may also reset other important systems in the vehicle.

Tools Needed to Use:

OBD-II scanner: To read and clear DTCs and monitor sensor readings.
Basic hand tools: To inspect and repair power steering components.
Multimeter: To test electrical components like sensors and wiring.
Power steering fluid: To top off the fluid level if necessary.

Toyota Sequoia DTC P0553: Power Steering Pressure Sensor Circuit High Input

Description: This code indicates that the engine control module (ECM) has detected a high input signal from the power steering pressure sensor, which measures the hydraulic pressure in the power steering system.

Symptoms:

Heavy steering feel
Poor steering response
Power steering fluid leak
Check engine light or power steering warning light illuminated

Cause:

Faulty power steering pressure sensor
Damaged or corroded wiring or connectors
Power steering fluid leak
Faulty power steering pump

Possible Location:

Power steering pressure sensor
Power steering pump
Power steering hoses and lines
Wiring and connectors

How to Fix the Problem:

Inspect the power steering pressure sensor and its wiring for damage or corrosion.
Test the power steering pressure sensor using a multimeter and replace it if necessary.
Check the power steering fluid level and top off if needed.
Inspect the power steering hoses and lines for leaks and replace if necessary.
Test the power steering pump for proper operation and replace if required.

How Difficult to Fix: Moderate difficulty, depending on the specific issue.

Can You Drive With This Code: Yes, but driving with a malfunctioning power steering system can be difficult and may lead to reduced vehicle control and safety concerns.

How to Clear the Code:

Use an OBD-II scanner to clear the code after fixing the issue.
Disconnecting the battery may reset the ECM, but it’s not recommended as it may also reset other important systems in the vehicle.

Tools Needed to Use:

OBD-II scanner: To read and clear DTCs and monitor sensor readings.
Basic hand tools: To inspect and repair power steering components.
Multimeter: To test electrical components like sensors and wiring.
Power steering fluid: To top off the fluid level if necessary.

Toyota Sequoia DTC C1223: ABS Control System Malfunction

Description: This code indicates that there is a malfunction in the anti-lock braking system (ABS) control module, which is responsible for managing the ABS function during emergency braking or on slippery surfaces.

Symptoms:

ABS warning light illuminated
Reduced braking performance during hard braking or on slippery surfaces
Possible traction control system malfunction

Cause:

Faulty ABS control module
Damaged or corroded wiring or connectors
Faulty wheel speed sensors
Malfunctioning hydraulic control unit

Possible Location:

ABS control module
Wheel speed sensors
Hydraulic control unit
Wiring and connectors

How to Fix the Problem:

Use an OBD-II scanner to check for any additional ABS-related codes.
Inspect the wiring and connectors associated with the ABS system for damage or corrosion.
Test the wheel speed sensors for proper operation and replace if necessary.
Inspect the hydraulic control unit for damage or leaks and replace if required.
If all other components are functioning properly, consider replacing the ABS control module.

How Difficult to Fix: Moderate to high difficulty, depending on the specific issue.

Can You Drive With This Code: Yes, but be cautious as the ABS system may not function properly, potentially reducing braking performance during hard braking or on slippery surfaces.

How to Clear the Code:

Use an OBD-II scanner to clear the code after fixing the issue.
Disconnecting the battery may reset the ABS control module, but it’s not recommended as it may also reset other important systems in the vehicle.

Tools Needed to Use:

OBD-II scanner: To read and clear DTCs and monitor sensor readings.
Basic hand tools: To inspect and repair ABS components.
Multimeter: To test electrical components like sensors and wiring.

Toyota Sequoia DTC C1295: Brake Lamp Switch Circuit Malfunction

Description: This code indicates that there is a malfunction in the brake lamp switch circuit, which is responsible for activating the brake lights when the brake pedal is pressed.

Symptoms:

Brake lights not functioning
Cruise control not working properly
ABS or traction control system malfunction
Illuminated warning lights on the dashboard

Cause:

Faulty brake lamp switch
Damaged or corroded wiring or connectors
Blown brake light fuse
Burnt-out brake light bulbs

Possible Location:

Brake lamp switch
Brake light wiring and connectors
Brake light fuse
Brake light bulbs

How to Fix the Problem:

Check the brake light bulbs and replace them if burnt out.
Inspect the brake lamp switch and its wiring for damage or corrosion. Replace the switch if necessary.
Check the brake light fuse and replace it if blown.
If the issue persists, inspect the brake light circuit wiring and connectors for damage, and repair if necessary.

How Difficult to Fix: Easy to moderate difficulty, depending on the specific issue.

Can You Drive With This Code: Yes, but driving without functioning brake lights is dangerous and may result in accidents or traffic citations.

How to Clear the Code:

Use an OBD-II scanner to clear the code after fixing the issue.
Disconnecting the battery may reset the ABS control module, but it’s not recommended as it may also reset other important systems in the vehicle.

Tools Needed to Use:

OBD-II scanner: To read and clear DTCs and monitor sensor readings.
Basic hand tools: To inspect and repair brake light components.
Multimeter: To test electrical components like switches, wiring, and fuses.

Toyota Sequoia DTC P1604: Startability Malfunction

Description: This code indicates that the engine control module (ECM) has detected a problem related to the engine’s ability to start.

Symptoms:

Difficulty starting the engine
Engine stalling after starting
Check engine light illuminated

Cause:

Faulty starter
Weak or discharged battery
Faulty ignition switch
Damaged or corroded wiring or connectors
Faulty crankshaft or camshaft position sensors
Fuel system issues

Possible Location:

Starter
Battery
Ignition switch
Crankshaft or camshaft position sensors
Wiring and connectors
Fuel system components

How to Fix the Problem:

Test the battery and ensure it is fully charged and functioning properly. Replace if necessary.
Inspect the starter and its wiring for damage or corrosion. Test the starter and replace if necessary.
Check the ignition switch for proper operation and replace if required.
Inspect the crankshaft and camshaft position sensors and their wiring. Replace the sensors if necessary.
Check the fuel system components, such as the fuel pump, fuel filter, and fuel injectors, for proper operation and repair or replace as needed.

How Difficult to Fix: Moderate difficulty, depending on the specific issue.

Can You Drive With This Code: It may be difficult or impossible to drive if the engine cannot be started or stalls after starting.

How to Clear the Code:

Use an OBD-II scanner to clear the code after fixing the issue.
Disconnecting the battery may reset the ECM, but it’s not recommended as it may also reset other important systems in the vehicle.

Tools Needed to Use:

OBD-II scanner: To read and clear DTCs and monitor sensor readings.
Basic hand tools: To inspect and repair engine components.
Multimeter: To test electrical components like sensors, wiring, and switches.
Battery charger/tester: To test and charge the battery, ensuring it is fully charged and functioning properly.

WORDS FROM ERWIN SALARDA

Toyota Sequoia is a reliable and versatile vehicle, but it is important to be aware of the common OBD DTC issues that can arise. Regular maintenance and early diagnosis can help prevent these issues from becoming major problems and ensure the smooth operation of your Toyota Sequoia. If you experience any of the issues listed above, it is recommended to take your vehicle to a professional mechanic for proper diagnosis and repair.