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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: 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)
Common causes
Ordered by how often each turns out to be the cause.
- Valve mechanically seized closedCommon
- DEF crystallization blocks valvePossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Reductant Injection Valve B1 U2
P2EAF is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.