OBD-II code · Network
U0108 Lost Communication With Alternative Fuel Control Module
The ECU has lost CAN communication with the alternative fuel control module (CNG/LPG/H2 systems). Either the module is not responding or the bus path is broken.
Is it safe to drive with U0108?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule unpowered or fuse blown
- PossibleCAN wiring to module broken
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Alt Fuel Module, Can Bus
Related codes
- U0105Lost Communication with Fuel Injector Control Module
- U0106Lost Communication with Glow Plug Control Module
- U0107Lost Communication with Throttle Actuator Control Module
- U0109Lost Communication with Fuel Pump Control Module
- U010ALost Communication With Exhaust Gas Recirculation Control Module A
- U010BLost Communication With Exhaust Gas Recirculation Control Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.