Powertrain
generic / SAE
P223B
Reductant Heater F Control Circuit
Reductant Heater F Control Circuit: the control circuit has an electrical fault. The reductant (DEF/AdBlue) heater keeps the urea fluid from freezing; a fault can impair SCR dosing in cold conditions.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 3B
Possible causes
- Heater winding or wiring fault high
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: 80–800 €
- Estimated time: 0.7–3 h
- Component: reductant line heater f
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012