The 22 MOST COMMON OBD DTC of Toyota Hilux

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:

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  • 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.

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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.

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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:

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  • 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:

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  • 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.

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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.

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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.

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:

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  • 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:

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  • 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.

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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.

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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:

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  • 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:

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  • 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.

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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:

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  • 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:

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  • 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.

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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.

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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:

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  • 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:

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  • 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.

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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:

  • 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:

First, diagnose and fix the underlying problem before attempting to clear the code. To clear DTC P1264, 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 P2564

Description:

DTC P2564 is related to the Turbocharger Boost Control Position Sensor Circuit. This code indicates that the Engine Control Module (ECM) has detected an incorrect signal from the sensor that monitors the position of the variable geometry turbocharger’s vanes.

Symptoms:

Some of the symptoms associated with DTC P2564 may include:
– Decreased engine power
– Poor acceleration
– Reduced fuel efficiency
– Engine may enter limp mode
– Malfunction Indicator Light (MIL) illuminated

Cause:

Possible causes for DTC P2564 include:
– Faulty boost control position sensor
– Damaged or corroded wiring/connectors
– Malfunctioning variable geometry turbocharger actuator
– Mechanical issue with the turbocharger vanes

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How to Clear the Code:

To clear DTC P2564, it is essential to fix the underlying problem first. After addressing the issue, use an OBD scan tool to clear the code. It is not recommended to disconnect the battery, as this will reset the ECU’s relearn process and may cause additional issues.


Toyota Hilux DTC P0488

Description:

DTC P0488 refers to the Exhaust Gas Recirculation (EGR) Throttle Control Circuit performance. This code is triggered when the Engine Control Module (ECM) detects a problem with the EGR system’s throttle control, which could affect the engine’s emissions and performance.

Symptoms:

Symptoms associated with DTC P0488 may include:
– Poor engine performance
– Increased emissions
– Engine hesitation or stalling
– Malfunction Indicator Light (MIL) illuminated

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Cause:

Possible causes for DTC P0488 include:
– Faulty EGR valve
– Damaged or corroded wiring/connectors
– Faulty EGR throttle control actuator
– Vacuum leaks in the EGR system
– Clogged EGR passages

How to Clear the Code:

To clear DTC P0488, first address the underlying issue causing the code. Once the problem has been 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 additional issues.


Toyota Hilux DTC P1251

Description:

DTC P1251 refers to the Turbocharger Pressure Control Solenoid Valve Circuit issue. This code is triggered when the Engine Control Module (ECM) detects an abnormality in the operation of the turbocharger pressure control solenoid valve, which could affect the engine’s performance and efficiency.

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Symptoms:

Symptoms associated with DTC P1251 may include:
– Loss of engine power
– Poor acceleration
– Hesitation or turbo lag
– Decreased fuel efficiency
– Malfunction Indicator Light (MIL) illuminated

Cause:

Possible causes for DTC P1251 include:
– Faulty turbocharger pressure control solenoid valve
– Damaged or corroded wiring/connectors
– Vacuum leaks in the turbocharger system
– Faulty turbocharger or wastegate
– Malfunctioning ECM

How to Clear the Code:

To clear DTC P1251, first address the underlying issue causing the code. Once the problem has been 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 additional issues.

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Toyota Hilux DTC 34

Description:

DTC 34 is associated with the Turbocharger Pressure Sensor Circuit. This code is triggered when the Engine Control Module (ECM) detects a malfunction or an out-of-range signal from the turbocharger pressure sensor, potentially affecting engine performance and efficiency.

Symptoms:

Symptoms related to DTC 34 may include:
– Loss of engine power
– Poor acceleration
– Hesitation or turbo lag
– Decreased fuel efficiency
– Malfunction Indicator Light (MIL) illuminated

Cause:

Possible causes for DTC 34 include:
– Faulty turbocharger pressure sensor
– Damaged or corroded wiring/connectors
– Vacuum leaks in the turbocharger system
– Faulty turbocharger or wastegate
– Malfunctioning ECM

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How to Clear the Code:

To clear DTC 34, first fix the underlying issue causing the code. Once the problem has been 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 additional issues.


Toyota Hilux DTC 78

Description:

DTC 78 is related to the Fuel Pump Control Circuit. This code is triggered when the Engine Control Module (ECM) detects a problem with the fuel pump control circuit or an abnormal signal from the fuel pump relay. This issue can affect the fuel delivery system, leading to engine performance problems.

Symptoms:

Symptoms associated with DTC 78 may include:
– Engine hesitation or misfire
– Poor acceleration
– Hard starting or no-start condition
– Stalling while driving
– Malfunction Indicator Light (MIL) illuminated

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Cause:

Possible causes for DTC 78 include:
– Faulty fuel pump relay
– Damaged or corroded wiring/connectors
– Faulty fuel pump
– 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,

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