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U0142
System
Network (CAN Bus)
Scanner som krävs
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.

Vanliga symptom

  • Random electrical gremlins
  • Door lock issues
  • Lighting faults

Typiska orsaker

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

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 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.