Powertrain
Definition only
Lights the check engine lamp
P201F: Reductant Pump A Stuck On
Standardized SAE J2012 code · P20xx — Fuel & air metering and auxiliary emission controls
What does P201F mean?
Reductant Pump A Stuck On: the actuator is stuck in the on position.
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 Pump relay contacts welded
- Medium Pump driver line shorted to B+
- Low Carbon or debris buildup preventing free movement
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P201F on the same make and model first.
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