OBD-II code · Powertrain (generic, extended)
P2AB2 Catalyst Heater Control Module Supply Voltage
The catalyst heater control module reports supply voltage outside the expected window. Heating output cannot be regulated as expected.
Is it safe to drive with P2AB2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule supply fuse blown
- PossibleAlternator regulator drift
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Catalyst Heater Module, Wiring Harness
Related codes
- P2AAFDiesel Fuel Presence Sensor Circuit High
- P2AB0Particulate Matter Sensor Processor Performance
- P2AB1Catalyst Heater Control Module Performance
- P2AB3Cold Start Intake Manifold Runner Control Stuck Open Bank 1
- P2AB4Cold Start Intake Manifold Runner Control Stuck Open Bank 2
- P2AB5Cold Start Intake Manifold Runner Control Stuck Closed Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.