B3979
Incorrect Environmental Identifier Received from HVAC Control Module
B3979 is an OBD-II diagnostic trouble code meaning: Incorrect Environmental Identifier Received from HVAC Control Module. Common causes: hvac module malfunction, broken or damaged wiring harness. Estimated repair cost: $56–167.
Symptoms
- Incorrect operation of climate control
- Errors on the HVAC system display
- Incorrect temperature or humidity readings
Causes
- HVAC module malfunction
- Broken or damaged wiring harness
- Software error
- HVAC Module Power Problems
How to Fix
- Diagnostics of communication with the HVAC module
- Checking the integrity of the wiring harness
- HVAC Module Software Update
- Replacing the HVAC module if necessary
Related codes
Error B3979 by Vehicle Brand
FAQ
What does the B3979 code mean?
B3979 is an OBD-II diagnostic trouble code that indicates: Incorrect Environmental Identifier Received from HVAC Control Module
What causes a B3979 error code?
The most common causes of B3979 include: HVAC module malfunction; Broken or damaged wiring harness; Software error; HVAC Module Power Problems.
How do I fix a B3979 diagnostic trouble code?
To fix B3979: Diagnostics of communication with the HVAC module. Checking the integrity of the wiring harness. HVAC Module Software Update. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B3979?
Yes, but get it checked soon
How much does it cost to fix B3979?
The estimated repair cost for B3979 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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