Code result
U02AB
Lost Communication With Vehicle Thermal Management Control Module
High severity
What it means
The vehicle bus reports loss of communication with the vehicle thermal management module. Coordination of engine, battery and cabin cooling/heating loops is lost; sub-modules fall back to local control.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Bus wiring open or shorted
highOne of the most commonly reported causes for this code — check this first.
Module without power or ground
mediumA plausible cause — test and verify before replacing parts.
Module failed
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose U02AB freeNo credit card required