Powertrain
generic / SAE
P2AB1
Catalyst Heater Control Module Performance
The ECM detects that the catalyst heater control module does not respond to commands within the expected window. Heating output is reduced or absent during catalyst light-off.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / B1
Possible causes
- Internal control module fault high
- Communication with ECM degraded medium
- Module software outdated, reflash may resolve low
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2000 €
- Estimated time: 2–6 h
- Component: catalyst heater module
- Component: catalyst heater element
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012