OBD-II code · Powertrain (generic, extended)
P208D Reductant Pump A Control Circuit High
DEF pump A control line stuck high — short to B+. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P208D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort to B+
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Pump
Related codes
- P208AReductant Pump A Control Circuit/Open
- P20FDReductant Pump B Control Circuit High
- P208BReductant Pump A Control Performance/Stuck Off
- P208CReductant Pump A Control Circuit Low
- P208EReductant Injection Valve Stuck Closed (Bank 1 Unit 1)
- P208FReductant Injection Valve Stuck Closed (Bank 2 Unit 1)
- P2090Camshaft Position B Actuator Control Circuit Low (Bank 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.