Sök
U0109
System
Network (CAN Bus)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Lost Communication with Fuel Pump Control Module

Understand U0109, common causes, and the right TOPDON scanner to diagnose it.

Fuel pump control module not on network — fuel delivery may be affected.

Vanliga symptom

  • No-start
  • Engine stall
  • Fuel pump silent

Typiska orsaker

  • Failed fuel pump module
  • CAN wiring
  • In-tank module connector corrosion

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 U0109 mean?
U0109 indicates lost communication with fuel pump control module. Fuel pump control module not on network — fuel delivery may be affected.
Can I diagnose U0109 with a basic code reader?
U0109 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 U0109?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with U0109?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.