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U0108
System
Network (CAN Bus)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Lost Communication with Alternative Fuel Control Module

Understand U0108, common causes, and the right TOPDON scanner to diagnose it.

Alternative fuel (CNG/LPG) control module not communicating.

Vanliga symptom

  • Engine won't run on alt fuel
  • Warning lights

Typiska orsaker

  • Failed alt fuel module
  • CAN fault
  • Empty or switched fuel system

Vilken scanner behöver du?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

What does U0108 mean?
U0108 indicates lost communication with alternative fuel control module. Alternative fuel (CNG/LPG) control module not communicating.
Can I diagnose U0108 with a basic code reader?
U0108 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for U0108?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with U0108?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.