U1308 – OBD-II DTC

OBD-II DTC U1308 – SCP (J1850) Invalid or Missing Data for Function Read Engine Torque

DTC U1308 meaning

DTC U1308 refers to a communication error within the vehicle’s network, specifically indicating “Invalid or Missing Data for Function Read Engine Torque.” This code is part of the On-Board Diagnostics II (OBD-II) system and is associated with the SCP (Serial Communication Protocol) using the J1850 protocol. It suggests that the Engine Control Module (ECM) is unable to receive valid data regarding engine torque from other modules in the vehicle.

DTC U1308 symptoms

Common symptoms associated with DTC U1308 may include:

• Check Engine Light illuminated
• Engine performance issues
• Inconsistent or erratic engine behavior
• Loss of communication with other modules
• Potential issues with vehicle features that rely on engine torque data

DTC U1308 causes

Several factors can lead to the triggering of DTC U1308, including:

• Faulty wiring or connectors in the communication network
• Defective Engine Control Module (ECM)
• Malfunctioning sensors that provide torque data
• Software issues or bugs in the vehicle’s control modules
• Interference from aftermarket devices or modifications

DTC U1308 seriousness

DTC U1308 is considered a moderate to serious issue. While it may not immediately affect the vehicle’s drivability, it can lead to performance problems and may prevent the vehicle from passing emissions tests. Ignoring this code can result in further complications, including damage to the engine or other components due to improper torque readings.

How to diagnose DTC U1308

To diagnose DTC U1308, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the U1308 code.
2. Check for any additional DTCs that may provide more context.
3. Inspect the wiring and connectors related to the communication network for damage or corrosion.
4. Test the Engine Control Module (ECM) for proper operation.
5. Verify the functionality of sensors that provide engine torque data.
6. Check for software updates or reprogramming needs for the control modules.

How to fix DTC U1308 step-by-step instructions

To fix DTC U1308, follow these steps:

1. Clear the DTC using an OBD-II scanner.
2. Inspect and repair any damaged wiring or connectors in the communication network.
3. Replace any faulty sensors that may be affecting torque data.
4. Reprogram or update the ECM if necessary.
5. Reconnect all components and ensure proper connections.
6. Test drive the vehicle to see if the code reappears.

How to erase DTC U1308

To erase DTC U1308, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Access the DTC menu on the scanner.
4. Select the option to clear or erase trouble codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to ensure the code does not return.

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