Powertrain
generic / SAE
P2EAF
Reductant Injection Valve Stuck Closed Bank 1 Unit 2
The reductant injection valve on bank 1 unit 2 is stuck closed. No DEF/AdBlue can be dosed on this unit.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberE / AF
Possible causes
- Valve mechanically seized closed high
- DEF crystallization blocks valve 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: 200–1500 €
- Estimated time: 1–5 h
- Component: reductant injection valve b1 u2
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012