Powertrain
generic / SAE
P208B
Reductant Pump A Control Performance/Stuck Off
DEF pump A receives a run command but does not start, or shuts off prematurely — pump performance is below threshold.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 8B
Possible causes
- Pump motor seized — DEF crystallised inside pump head high
- Motor brushes worn medium
- Carbon or debris buildup preventing free movement low
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: 150–1100 €
- Estimated time: 1–3.5 h
- Component: reductant pump
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012