This generic communication code indicates the powertrain control module (PCM) has lost contact with the alternative fuel control module. It suggests a disruption in the data network rather than a mechanical engine failure. The vehicle may default to primary fuel or enter a limp mode.
Physical damage to the harness or corrosion at the connector prevents data signals from reaching the module.
The alternative fuel control module cannot communicate if it lacks proper electrical supply or grounding.
The internal electronics of the specific fuel controller may have failed, stopping all network transmission.
A short or open circuit on the high or low communication lines disrupts data flow across the vehicle network.
Corrupted calibration data within the controller may cause it to stop responding to network requests.
Internal failure of the main engine computer is an unlikely cause for this specific communication loss code.
No, replacing the main engine computer is rarely the solution for communication loss codes like U0108.
Caution is advised as the vehicle may run poorly or lack power depending on fuel system configuration.
No, this indicates an electronic communication issue, not internal mechanical engine damage.
No, the code will return immediately if the underlying communication fault is not repaired.