P2EAD
Reductant Metering Unit 2 Performance
The reductant metering unit 2 does not deliver the expected DEF/AdBlue dosing within the calibrated profile. Pump aging or pressure regulator drift.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
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.
- Pump output degradedCommon
- Pressure regulator driftedPossible
Parts involved
- Reductant Metering Unit 2
P2EAD 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.