Powertrain
generic / SAE
P2DA4
Coolant Heater A Internal Control Module Performance
The internal control module of coolant heater A reports a performance fault. Internal self-tests fail.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberD / A4
Possible causes
- Internal module fault high
- Firmware corruption medium
- Module software outdated, reflash may resolve low
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 1–5 h
- Component: coolant heater a
- Component: coolant heater a control module
- MIL / check engine light
Sources
References
sae:J2012