P208A
Reductant Pump A Control Circuit/Open
The control line driving DEF pump A is open — no continuity through the motor or harness, dosing pressure cannot be built.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: 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)
Common causes
Ordered by how often each turns out to be the cause.
- Pump motor winding openCommon
- Open wire to pumpPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Reductant Pump
- Reductant Pump Relay
- Reductant Supply Harness
P208A 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.