BMW DTC U0108 – Lost Communication With Alternative Fuel Control Module
DTC U0108 meaning on BMW
The DTC U0108 code on a BMW indicates a communication problem between the vehicle’s engine control module (ECM) and the alternative fuel control module. This code specifically points to a lost communication issue, meaning that the ECM is unable to receive data from the alternative fuel control module.
BMW DTC U0108 symptoms
Symptoms of a DTC U0108 code on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Engine running rough or misfiring
- Reduced fuel efficiency
- Difficulty starting the vehicle
BMW DTC U0108 causes
The potential causes of a DTC U0108 code on a BMW include:
- Wiring or connection issues between the ECM and alternative fuel control module
- Defective alternative fuel control module
- Faulty ECM
- Software or programming issues
BMW DTC U0108 seriousness
While a DTC U0108 code may not always result in immediate drivability issues, it is important to address the underlying communication problem between the ECM and alternative fuel control module. Ignoring this code can lead to potential performance issues and may affect the vehicle’s overall operation.
How to diagnose DTC U0108 on BMW
To diagnose a DTC U0108 code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the specific fault code
- Inspect the wiring and connections between the ECM and alternative fuel control module
- Check for any visible damage or corrosion in the wiring harness
- Test the alternative fuel control module for proper functionality
- Verify that the ECM is receiving power and ground signals
How to fix DTC U0108 on BMW
To fix a DTC U0108 code on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connectors between the ECM and alternative fuel control module
- Replace the alternative fuel control module if found to be faulty
- Update or reprogram the ECM software if necessary
- Clear the fault code and perform a test drive to ensure the issue has been resolved
How to erase DTC U0108 on BMW
To erase a DTC U0108 code on a BMW, follow these steps:
- Use a diagnostic scanner to access the vehicle’s ECM
- Select the option to clear the fault codes stored in the system
- Confirm the deletion of the DTC U0108 code
- Turn off the ignition and restart the vehicle to ensure the code has been successfully erased
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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