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.
- 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 motor openCommon
- Connector unplugged or corrodedPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Reductant Pump
- Reductant Pump Wiring
P20EA 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.