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U0142
System
Network (CAN Bus)
Benötigter Scanner
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Lost Communication with Body Control Module B

Understand U0142, common causes, and the right TOPDON scanner to diagnose it.

Secondary BCM not on network — lights, locks, or accessories may misbehave.

Häufige Symptome

  • Random electrical gremlins
  • Door lock issues
  • Lighting faults

Typische Ursachen

  • Failed BCM
  • CAN wiring in dash
  • Water leak into BCM
  • Low voltage

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 U0142 mean?
U0142 indicates lost communication with body control module b. Secondary BCM not on network — lights, locks, or accessories may misbehave.
Can I diagnose U0142 with a basic code reader?
U0142 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 U0142?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with U0142?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.