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U0102
System
Network (CAN Bus)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Lost Communication with Transfer Case Control Module

Understand U0102, common causes, and the right TOPDON scanner to diagnose it.

4WD/AWD transfer case module offline — common on trucks and SUVs after water exposure.

Vanliga symptom

  • 4WD inop
  • Service 4WD message
  • Multiple U-codes

Typiska orsaker

  • TCM/transfer case module fault
  • CAN wiring
  • Low voltage
  • 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 U0102 mean?
U0102 indicates lost communication with transfer case control module. 4WD/AWD transfer case module offline — common on trucks and SUVs after water exposure.
Can I diagnose U0102 with a basic code reader?
U0102 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 U0102?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with U0102?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.