Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberE / AD
Possible causes
- Pump output degraded high
- Pressure regulator drifted 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)
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2500 €
- Estimated time: 2–8 h
- Component: reductant metering unit 2
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012