Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / B2
Possible causes
- Module supply fuse blown high
- Alternator regulator drift medium
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 100–500 €
- Estimated time: 0.5–3 h
- Component: catalyst heater module
- Component: wiring harness
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012