Powertrain
generic / SAE
P20E0
Reductant Pressure Too Low
The pressure in the SCR reductant (AdBlue/DEF) line is below the calibrated minimum. Without sufficient pressure the dosing module cannot atomise reagent properly, leading to NOx exceedence.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / E0
Possible causes
- Worn DEF pump high
- Leak in DEF line medium
- Clogged DEF filter 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: 1.5–6 h
- Component: def pump
- Component: def pressure sensor
- Component: def lines
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012