P208D: Reductant Pump A Control Circuit High
Standardized SAE J2012 code · P20xx — Fuel & air metering and auxiliary emission controls
What does P208D mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
- High Short to B+
- Low Connector pins corroded - high contact resistance
- Low Supply wire pinched against B+ source
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P208D on the same make and model first.
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