Powertrain
generic / SAE
P20E9
Reductant Pressure Too High
Manufacturer-specific variant of the reductant over-pressure condition. The pressure exceeds the upper threshold during a defined operating window; on some platforms used in addition to P20E2 to flag a different test path.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / E9
Possible causes
- Return line blocked or frozen high
- Pressure sensor reads high 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: medium
- DIY: shop recommended
- Estimated cost: 250–1500 €
- Estimated time: 1–4 h
- Component: reductant pump
- Component: reductant pressure sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012