Powertrain
generic / SAE
P20EA
Reductant Pump Control Circuit Open
The control circuit to the reductant (DEF) dosing pump is open — no current flow detected. Without pump pressure no AdBlue reaches the SCR catalyst and NOx reduction stops.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / EA
Possible causes
- Pump motor open high
- Connector unplugged or corroded medium
- Pin pushed back out of connector body low
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: 200–1200 €
- Estimated time: 1–4 h
- Component: reductant pump
- Component: reductant pump wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012