Decoding the Language of Trucks: A Deep Dive into Truck-Specific Diagnostic Trouble Codes (DTC)

Trucks operate under demanding conditions, making their Diagnostic Trouble Codes (DTC) critical for maintaining their performance and safety. This guide provides a detailed look into some of the most common and crucial truck-specific DTCs, enabling fleet managers and mechanics to quickly address issues.

Engine Management DTCs

• P0016 – Crankshaft Position-Camshaft Position Correlation

  Indicates a timing issue between the crankshaft and camshaft. Common in trucks with high mileage.

• P0401 – Exhaust Gas Recirculation Flow Insufficient

  Reflects problems in the EGR system, a crucial component for reducing NOx emissions in diesel trucks.

• P3000 Series – Fuel Injector Malfunction

  These codes (P3001, P3002, etc.) signify issues with fuel injectors, critical for engine efficiency and power.

Transmission and Drivetrain DTCs

• P0700 – Transmission Control System Malfunction

  A general code indicating an unspecified problem in the transmission system.

• P0720 – Output Speed Sensor Circuit Malfunction

  This code can imply issues with the truck’s speed sensor, affecting transmission performance.

• P2757 – Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off

  Specific to issues in the torque converter, a key component in automatic transmissions.

Braking System DTCs

• C0035 – Left Front Wheel Speed Sensor

  Indicates a malfunction in the wheel speed sensor, affecting ABS performance.

• C0040 – Right Front Wheel Speed Sensor Circuit Malfunction

  Similar to C0035, but specific to the right front wheel.

• C0110 – Pump Motor Circuit Malfunction

  Points to issues in the ABS pump motor circuit, essential for controlling braking in adverse conditions.

Electrical and Sensor-Related DTCs

• U0100 – Lost Communication with ECM/PCM

  A network code indicating communication issues with the Engine Control Module.

• U0140 – Lost Communication with Body Control Module

  Signifies problems in the communication with the truck’s Body Control Module, affecting various functionalities.

• U0284 – Lost Communication with Active Grill Air Shutter ‘A’ Motor

  Specific to newer models with active grill shutters for improved aerodynamics and engine cooling.

HVAC System DTCs

• B2413 – HVAC Blend Door Actuator Circuit

  This code indicates a malfunction in the HVAC blend door actuator, affecting cabin temperature control.

• B3770 – Outside Air Temperature Sensor Circuit

  Signals an issue with the sensor that monitors outside air temperature, crucial for efficient HVAC operation.

Advanced Safety Systems DTCs

• U3000 – Control Module

  A generic code indicating a fault within a control module, which could be related to advanced safety systems.

• U0155 – Lost Communication with Instrument Panel Cluster (IPC) Control Module

  This code suggests communication issues with the IPC, impacting the display of vital driving information.

Emission Control DTCs

• P242F – Diesel Particulate Filter (DPF) Restriction – Ash Accumulation

  Common in diesel trucks, indicating that the DPF is restricted with ash and may require cleaning or replacement.

• P0402 – Exhaust Gas Recirculation Flow Excessive Detected

  This code points to an issue where the EGR system is recirculating too much exhaust gas, which can impact engine performance.

Suspension System DTCs

• C1130 – Engine Signal 1

  In trucks with advanced suspension systems, this code can indicate an engine-related fault affecting suspension control.

• C1163 – Air Pressure Low

  This code is vital for trucks with air suspension systems, indicating that the air pressure is below the required level for optimal operation.

Conclusion
This detailed exploration into truck-specific DTCs provides a clearer understanding of the common issues faced by heavy-duty vehicles. Timely identification and resolution of these codes are crucial for maintaining operational efficiency, safety, and compliance with regulatory standards. For comprehensive diagnostics, always refer to specialized scanning tools and consult with professional technicians experienced in truck maintenance and repair. Also be sure to check out our GPS Fleet Tracking Solutions that monitor DTC codes where you can track your vehicles and setup alerts and much more.