B3979

Incorrect Environmental Identifier Received from HVAC Control Module

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

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

B3978 B3980 U0155