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U0164
System
Network (CAN Bus)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Lost Communication with HVAC Control Module B

Understand U0164, common causes, and the right TOPDON scanner to diagnose it.

Secondary HVAC module offline on dual-zone or rear climate systems.

Vanliga symptom

  • Rear climate inop
  • Temperature sync issues

Typiska orsaker

  • Rear HVAC module fault
  • CAN wiring in console
  • 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 U0164 mean?
U0164 indicates lost communication with hvac control module b. Secondary HVAC module offline on dual-zone or rear climate systems.
Can I diagnose U0164 with a basic code reader?
U0164 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 U0164?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with U0164?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.