Powertrain
generic / SAE
P20EB
Reductant Reservoir Heater "A" Control Circuit
A general electrical fault on the reductant tank heater "A" control circuit. AdBlue freezes at -11 C, so the tank heater must work for cold-start dosing.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / EB
Possible causes
- Heater element failed high
- Wiring open or connector loose medium
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 1–4 h
- Component: reductant tank heater
- Component: reductant heater wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012