U0108

Lost Communication With Alternative Fuel Control Module

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Switching to the main fuel type
Check Engine light comes on
Reduced engine power
Starting problems on alternative fuel
Unstable engine operation

Causes

Open or short circuit in the communication circuit
Alternate fuel control module malfunction
Problems with module power supply (fuse blown)
Corrosion of electrical connectors
Vehicle CAN bus malfunction

How to Fix

Check Alternate Fuel Module fuses
Inspect connectors and wiring for damage
Check the integrity of the CAN bus
Test the alternative fuel module
If necessary, replace the control module

Related codes

U0100 U0101 U0140