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U0165: Lost Communication With HVAC Control Module - Rear

What Does U0165 Mean?

U0165 is a diagnostic trouble code indicating: Lost Communication With HVAC Control Module - Rear. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

What To Do Next

  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

U0160 Lost Communication With Audible Alert Control Module U0161 Lost Communication With Compass Module U0162 Lost Communication With Navigation Display Module U0163 Lost Communication With Navigation Control Module U0164 Lost Communication With HVAC Control Module U0166 Lost Communication With Auxiliary Heater Control Module U0167 Lost Communication With Vehicle Immobilizer Control Module U0168 Lost Communication With Vehicle Security Control Module