Powertrain
generic / SAE
P263D
Reductant Heater Driver Performance
The reductant (AdBlue) tank or line heater driver does not switch as expected. AdBlue may freeze in cold weather, blocking SCR dosing.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / 3D
Possible causes
- Aged driver shows degraded switching behaviour high
- Heater element resistance drifted out of range 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: hard
- DIY: shop recommended
- Estimated cost: 300–2000 €
- Estimated time: 1.5–5 h
- Component: reductant heater
- Component: reductant control module
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012