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U0109
System
Network (CAN Bus)
Benötigter Scanner
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.

Häufige Symptome

  • No-start
  • Engine stall
  • Fuel pump silent

Typische Ursachen

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

Welchen Scanner brauchen Sie?

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

Nutzen Sie Live-Daten und Freeze Frame, bevor Sie Teile tauschen. ABS-, SRS- und U-Codes erfordern meist einen Vollsystem-Scanner.

Diagnose-Tipps

  • Freeze Frame erfassen, wenn der Code erstmals gesetzt wird
  • Code erst nach Behebung der Ursache löschen
  • Auf verwandte pending codes prüfen
  • Batteriespannung über 12,4 V prüfen, bevor Sie Sensoren verdächtigen

Empfohlene TOPDON Scanner

Häufig gestellte Fragen

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.