Powertrain
Definition only
Lights the check engine lamp
P2AB2: Catalyst Heater Control Module Supply Voltage
Standardized SAE J2012 code · P2Axx codes
What does P2AB2 mean?
The catalyst heater control module reports supply voltage outside the expected window. Heating output cannot be regulated as expected.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Common causes
- High Module supply fuse blown
- Medium Alternator regulator drift
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2AB2 on the same make and model first.
P2AB2 in the community
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