The 22 MOST COMMON OBD DTC of Toyota Hilux

If you’re a Toyota Hilux owner, you’re likely familiar with the On-Board Diagnostics (OBD) system. This system provides real-time monitoring of your vehicle’s various components and alerts you when something is not functioning correctly. In this article, we’ll explore the 22 most common OBD Diagnostic Trouble Codes (DTCs) that can occur in a Toyota Hilux. These codes range from engine misfires to transmission issues and everything in between. Knowing these codes can help you identify and troubleshoot any problems with your Toyota Hilux quickly and effectively.

Toyota Hilux DTC P0045

Description:

The DTC (Diagnostic Trouble Code) P0045 refers to a problem with the turbocharger/supercharger boost control solenoid circuit. It indicates an issue in the electrical circuit controlling the solenoid valve responsible for managing the boost pressure in the turbocharger or supercharger system of your Toyota Hilux.

Symptoms:

Some common symptoms associated with DTC P0045 are:

Decreased engine performance or power
Increased fuel consumption
Engine hesitation or surging
Turbocharger or supercharger not working properly
Check engine light illuminated

Cause:

DTC P0045 can be caused by various factors, such as:

Faulty boost control solenoid
Open or shorted solenoid wiring
Corroded or damaged connectors
Faulty turbocharger or supercharger
Malfunctioning Engine Control Module (ECM)

How to Clear the Code:

Before attempting to clear the code, it’s important to diagnose and fix the problem first. To clear DTC P0045, it is recommended to use an OBD-II scan tool instead of disconnecting the battery, as the latter method will reset the ECU’s adaptive learning and may cause further issues. Once the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P2121

Description:

DTC (Diagnostic Trouble Code) P2121 is related to the Throttle/Pedal Position Sensor/Switch “D” Circuit Range/Performance. This code indicates that the Engine Control Module (ECM) has detected a malfunction or an out-of-range signal from the throttle position sensor or the accelerator pedal position sensor.

Symptoms:

Symptoms associated with DTC P2121 can include:

Reduced engine performance
Erratic throttle response
Engine stalling
Check engine light illuminated
Difficulty accelerating

Cause:

Possible causes for DTC P2121 are:

Faulty throttle position sensor
Faulty accelerator pedal position sensor
Wiring or connector issues (corrosion, damage, or shorts)
Malfunctioning Engine Control Module (ECM)

How to Clear the Code:

Before attempting to clear the code, diagnose and fix the underlying problem first. To clear DTC P2121, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may lead to further issues. Once the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC C1201

Description:

DTC (Diagnostic Trouble Code) C1201 is related to the Engine Control System Malfunction. This code is triggered when the Engine Control Module (ECM) detects a fault within the engine control system that affects the vehicle’s overall performance and emissions. As a result, the ECM communicates the issue to the Anti-lock Brake System (ABS) module, which stores the C1201 code.

Symptoms:

Symptoms associated with DTC C1201 can include:

Reduced engine performance
Engine stalling or rough idling
Decreased fuel efficiency
Check engine light illuminated
ABS warning light illuminated

Cause:

Possible causes for DTC C1201 are:

Faulty sensors or actuators in the engine control system
Malfunctioning Engine Control Module (ECM)
Wiring or connector issues (corrosion, damage, or shorts)
Malfunctioning Anti-lock Brake System (ABS) module

How to Clear the Code:

Before attempting to clear the code, diagnose and fix the underlying problem first. To clear DTC C1201, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may lead to further issues. Once the problem is resolved, use the scan tool to erase the code and reset the check engine light and ABS warning light.

Toyota Hilux DTC B2799

Description:

DTC (Diagnostic Trouble Code) B2799 is related to the Engine Immobilizer System Malfunction. This code indicates that the Engine Control Module (ECM) has detected a problem with the communication between the immobilizer system and the ECM, preventing the vehicle from starting due to the anti-theft feature.

Symptoms:

Symptoms associated with DTC B2799 can include:

Vehicle not starting
Intermittent starting issues
Security or key warning light illuminated

Cause:

Possible causes for DTC B2799 are:

Faulty key or transponder
Malfunctioning immobilizer system components
Wiring or connector issues (corrosion, damage, or shorts)
Malfunctioning Engine Control Module (ECM)

How to Clear the Code:

Before attempting to clear the code, diagnose and fix the underlying problem first. To clear DTC B2799, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may lead to further issues. Once the problem is resolved, use the scan tool to erase the code and reset the security or key warning light.

Toyota Hilux DTC C1203

Description:

DTC (Diagnostic Trouble Code) C1203 is related to the Brake Fluid Pressure Sensor Circuit Malfunction. This code indicates that the Engine Control Module (ECM) or the ABS (Anti-lock Brake System) module has detected an issue with the brake fluid pressure sensor circuit, which can affect the vehicle’s braking performance.

Symptoms:

Symptoms associated with DTC C1203 can include:

Reduced braking performance
ABS warning light illuminated
Brake warning light illuminated
Increased brake pedal effort

Cause:

Possible causes for DTC C1203 are:

Faulty brake fluid pressure sensor
Wiring or connector issues (corrosion, damage, or shorts)
Low brake fluid level
Malfunctioning ABS module

How to Clear the Code:

Before attempting to clear the code, diagnose and fix the underlying problem first. To clear DTC C1203, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may lead to further issues. Once the problem is resolved, use the scan tool to erase the code and reset the ABS and brake warning lights.

Toyota Hilux DTC P1604

Description:

DTC (Diagnostic Trouble Code) P1604 is related to the Startability Malfunction. This code indicates that the Engine Control Module (ECM) has detected a problem with the vehicle’s starting system, which prevents the engine from starting or causes difficulty in starting the engine.

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Symptoms:

Symptoms associated with DTC P1604 can include:

Difficulty starting the engine
Intermittent starting issues
Engine stalling
Check engine light illuminated

Cause:

Possible causes for DTC P1604 are:

Faulty starter motor or solenoid
Worn or damaged ignition components
Low battery voltage or weak battery
Malfunctioning Engine Control Module (ECM)
Faulty sensors or actuators affecting engine starting

How to Clear the Code:

Before attempting to clear the code, diagnose and fix the underlying problem first. To clear DTC P1604, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may lead to further issues. Once the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P1605

Description:

DTC (Diagnostic Trouble Code) P1605 is related to the Knock Control CPU Malfunction. This code indicates that the Engine Control Module (ECM) has detected an issue with the knock control CPU, which is responsible for monitoring and controlling engine knock or detonation.

Symptoms:

Symptoms associated with DTC P1605 can include:

Reduced engine performance
Engine knocking or pinging noises
Poor fuel economy
Check engine light illuminated

Cause:

Possible causes for DTC P1605 are:

Faulty knock sensor
Wiring or connector issues (corrosion, damage, or shorts)
Malfunctioning Engine Control Module (ECM)
Low-quality or incorrect fuel octane

How to Clear the Code:

Before attempting to clear the code, diagnose and fix the underlying problem first. To clear DTC P1605, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may lead to further issues. Once the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P2463

Description:

DTC (Diagnostic Trouble Code) P2463 is related to the Diesel Particulate Filter (DPF) System. This code indicates that the Engine Control Module (ECM) has detected an excessive amount of soot accumulated in the DPF, which can lead to reduced engine performance and increased emissions.

Symptoms:

Symptoms associated with DTC P2463 can include:

Reduced engine performance
Poor fuel economy
Increased emissions
Check engine light illuminated

Cause:

Possible causes for DTC P2463 are:

Excessive soot accumulation in the DPF
Failed DPF regeneration process
Malfunctioning DPF pressure sensor
Wiring or connector issues (corrosion, damage, or shorts)
Faulty fuel injector(s) causing excessive soot production

How to Clear the Code:

Before attempting to clear the code, diagnose and fix the underlying problem first. To clear DTC P2463, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may lead to further issues. Once the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P0500

Description:

DTC (Diagnostic Trouble Code) P0500 is related to the Vehicle Speed Sensor (VSS) Circuit. This code indicates that the Engine Control Module (ECM) has detected a malfunction in the VSS circuit, which can affect various vehicle systems, including transmission shift points, engine performance, and the anti-lock braking system.

Symptoms:

Symptoms associated with DTC P0500 can include:

Erratic or inoperative speedometer
Transmission shifting problems
Poor engine performance
ABS warning light illuminated
Check engine light illuminated

Cause:

Possible causes for DTC P0500 are:

Malfunctioning vehicle speed sensor
Wiring or connector issues (corrosion, damage, or shorts)
Failed speedometer or instrument cluster
Problem with the ECM

How to Clear the Code:

Before attempting to clear the code, diagnose and fix the underlying problem first. To clear DTC P0500, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may lead to further issues. Once the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P0093

Description:

DTC (Diagnostic Trouble Code) P0093 refers to a “Fuel System Leak Detected – Large Leak.” This code is triggered when the Engine Control Module (ECM) detects a large fuel leak in the fuel system. This can be caused by issues within the fuel delivery system, such as the fuel injectors, fuel lines, or fuel pressure regulator.

Symptoms:

Symptoms associated with DTC P0093 can include:

Decreased engine performance
Increased fuel consumption
Hard starting or stalling
Check engine light illuminated
Strong fuel odor

Cause:

Possible causes for DTC P0093 are:

Leaking fuel injectors
Leaking fuel lines or connections
Faulty fuel pressure regulator
Cracked or damaged fuel tank
Problem with the ECM

How to Clear the Code:

First, diagnose and fix the underlying problem before attempting to clear the code. To clear DTC P0093, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may cause further issues. After the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P1601

Description:

DTC (Diagnostic Trouble Code) P1601 refers to “ECM/TCM Serial Communication Error.” This code is triggered when the Engine Control Module (ECM) detects a communication error between itself and the Transmission Control Module (TCM). This could be due to a faulty connection, damaged wiring, or a problem with either the ECM or TCM.

Symptoms:

Symptoms associated with DTC P1601 can include:

Transmission shifting issues
Decreased fuel efficiency
Loss of power
Check engine light illuminated
Transmission warning light illuminated

Cause:

Possible causes for DTC P1601 are:

Loose or corroded electrical connectors
Damaged or frayed wiring
Faulty ECM or TCM
Software issues in the ECM or TCM

How to Clear the Code:

First, diagnose and fix the underlying problem before attempting to clear the code. To clear DTC P1601, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may cause further issues. After the problem is resolved, use the scan tool to erase the code and reset the check engine light.

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Toyota Hilux DTC P0098

Description:

DTC (Diagnostic Trouble Code) P0098 refers to “Intake Air Temperature Sensor 2 Circuit High.” This code is triggered when the Engine Control Module (ECM) detects an abnormally high voltage from the Intake Air Temperature (IAT) Sensor 2, which is responsible for monitoring the temperature of the incoming air in the engine’s intake system.

Symptoms:

Symptoms associated with DTC P0098 can include:

Check engine light illuminated
Poor engine performance
Decreased fuel efficiency
Engine hesitation or stalling

Cause:

Possible causes for DTC P0098 are:

Faulty IAT Sensor 2
Open or short in the IAT Sensor 2 wiring or circuit
Loose or corroded electrical connectors
Contaminated or damaged sensor connector

How to Clear the Code:

First, diagnose and fix the underlying problem before attempting to clear the code. To clear DTC P0098, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may cause further issues. After the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC U0100

Description:

DTC (Diagnostic Trouble Code) U0100 refers to “Lost Communication with Engine Control Module (ECM).” This code is triggered when the communication between the ECM and other control modules in the vehicle is interrupted or lost.

Symptoms:

Symptoms associated with DTC U0100 can include:

Check engine light illuminated
Vehicle entering limp mode
Poor engine performance
Reduced power or acceleration
Engine stalling or not starting

Cause:

Possible causes for DTC U0100 are:

Faulty ECM
Open or short in the ECM communication wiring or circuit
Loose, corroded, or damaged electrical connectors
Failed or faulty CAN (Controller Area Network) bus

How to Clear the Code:

First, diagnose and fix the underlying problem before attempting to clear the code. To clear DTC U0100, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may cause further issues. After the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P0200

Description:

DTC (Diagnostic Trouble Code) P0200 refers to “Injector Circuit Malfunction.” This code is triggered when the Engine Control Module (ECM) detects an issue with one or more of the fuel injector circuits. The ECM monitors the operation of the fuel injectors to ensure optimal engine performance.

Symptoms:

Symptoms associated with DTC P0200 can include:

Check engine light illuminated
Poor engine performance
Decreased fuel efficiency
Engine misfire or rough idle
Engine stalling or not starting

Cause:

Possible causes for DTC P0200 are:

Faulty fuel injectors
Open or short in the injector wiring or circuit
Loose, corroded, or damaged electrical connectors
Faulty ECM

How to Clear the Code:

First, diagnose and fix the underlying problem before attempting to clear the code. To clear DTC P0200, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may cause further issues. After the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P2006

Description:

DTC (Diagnostic Trouble Code) P2006 refers to “Intake Manifold Runner Control Stuck Closed Bank 1.” This code is triggered when the Engine Control Module (ECM) detects that the intake manifold runner control valve is not functioning properly, particularly when it remains in the closed position in Bank 1.

Symptoms:

Symptoms associated with DTC P2006 can include:

Check engine light illuminated
Reduced engine performance
Poor acceleration
Decreased fuel efficiency

Cause:

Possible causes for DTC P2006 are:

Malfunctioning intake manifold runner control valve
Carbon buildup in the intake manifold
Faulty vacuum lines or solenoids
Electrical wiring or connector issues

How to Clear the Code:

First, diagnose and fix the underlying problem before attempting to clear the code. To clear DTC P2006, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may cause further issues. After the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P17A0

Description:

DTC (Diagnostic Trouble Code) P17A0 refers to “Shift Actuator Circuit Open.” This code is triggered when the Engine Control Module (ECM) detects a problem with the shift actuator circuit, specifically when there is an open circuit in the transmission shift actuator control system.

Symptoms:

Symptoms associated with DTC P17A0 can include:

Check engine light illuminated
Transmission shifting issues or delays
Transmission slipping
Vehicle stuck in a particular gear
Decreased fuel efficiency

Cause:

Possible causes for DTC P17A0 are:

Defective shift actuator
Open or short in the shift actuator circuit wiring
Malfunctioning Transmission Control Module (TCM)
Faulty connectors or corrosion in the connectors

How to Clear the Code:

First, diagnose and fix the underlying problem before attempting to clear the code. To clear DTC P17A0, use an OBD-II scan tool instead of disconnecting the battery, as disconnecting the battery will reset the ECU’s adaptive learning and may cause further issues. After the problem is resolved, use the scan tool to erase the code and reset the check engine light.

Toyota Hilux DTC P1264

Description:

DTC (Diagnostic Trouble Code) P1264 refers to “Exhaust Gas Recirculation (EGR) Cooler Bypass Control Stuck Open.” This code is triggered when the Engine Control Module (ECM) detects that the EGR cooler bypass control valve is stuck in the open position, causing excessive exhaust gas recirculation and negatively affecting the engine’s performance.

Symptoms:

Symptoms associated with DTC P1264 can include:

Check engine light illuminated
Decreased engine performance
Increased fuel consumption
Poor acceleration
Possible black smoke from the exhaust

Cause:

Possible causes for DTC P1264 are:

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Defective EGR cooler bypass control valve
Carbon buildup in the EGR cooler bypass control valve
Open or short in the EGR cooler bypass control valve wiring
Faulty connectors or corrosion in the connectors
Malfunctioning ECM

How to Clear the Code:

To clear DTC 78, first address the underlying problem causing the code. Once the issue is resolved, use an OBD scan tool to clear the code. Disconnecting the battery is not advised, as it will reset the ECU’s relearn process and could lead to further complications.

WORDS FROM ERWIN SALARDA

Attention all Toyota Hilux owners! Have you ever wondered what those mysterious dashboard lights mean? Or perhaps you’ve experienced issues with your engine or transmission, but you’re not sure what’s causing the problem. In this blog, I’m excited to share with you the 22 most common OBD Diagnostic Trouble Codes (DTCs) that can occur in a Toyota Hilux. By learning these codes and how to troubleshoot them effectively, you’ll be able to quickly identify and fix any issues with your vehicle. With this comprehensive guide to the OBD system in Toyota Hilux,