U1108 – OBD-II DTC

OBD-II DTC U1108 – SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter)

DTC U1108 meaning

DTC U1108 refers to a communication issue within the vehicle’s network, specifically indicating that there is invalid or missing data related to the Electric Traction Drive (Inverter). This code is part of the On-Board Diagnostics II (OBD-II) system and is associated with the SCP (J1850) communication protocol. The Electric Traction Drive is crucial for hybrid and electric vehicles, as it manages the power delivery from the battery to the electric motor.

DTC U1108 symptoms

Common symptoms associated with DTC U1108 may include:

• Illumination of the Check Engine Light (CEL)
• Reduced power or performance of the vehicle
• Inconsistent or erratic operation of the electric traction drive
• Possible failure of the vehicle to enter electric mode
• Diagnostic tools may show additional related trouble codes

DTC U1108 causes

Several factors can lead to the triggering of DTC U1108, including:

• Faulty or damaged wiring and connectors in the communication circuit
• Malfunctioning Electric Traction Drive (Inverter)
• Issues with the vehicle’s control modules
• Software glitches or outdated firmware in the vehicle’s systems
• Interference from other electronic components in the vehicle

DTC U1108 seriousness

DTC U1108 can be considered serious, especially for hybrid and electric vehicles, as it may affect the vehicle’s ability to operate efficiently. If left unaddressed, it could lead to further damage to the Electric Traction Drive or other related components, potentially resulting in costly repairs and reduced vehicle performance.

How to diagnose DTC U1108

To diagnose DTC U1108, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC U1108 and check for any additional trouble codes.
2. Inspect the wiring and connectors related to the Electric Traction Drive for any signs of damage or corrosion.
3. Check the functionality of the Electric Traction Drive (Inverter) using manufacturer-specific diagnostic tools.
4. Verify that all control modules are communicating properly within the vehicle’s network.
5. Update the vehicle’s software and firmware if necessary.

How to fix DTC U1108 step-by-step instructions

To fix DTC U1108, follow these step-by-step instructions:

1. Clear the DTC using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
2. If the code reappears, inspect the wiring and connectors for the Electric Traction Drive and repair or replace any damaged components.
3. Test the Electric Traction Drive (Inverter) for proper operation and replace it if it is found to be faulty.
4. Ensure that all control modules are functioning correctly and that there are no communication issues.
5. Reprogram or update the vehicle’s software if necessary to resolve any glitches.

How to erase DTC U1108

To erase DTC U1108, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the diagnostic menu and select the option to clear or erase trouble codes.
3. Confirm the action and wait for the scanner to complete the process.
4. Disconnect the scanner and take the vehicle for a test drive to ensure the code does not return.

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