Powertrain
Definition only
Lights the check engine lamp
P2D1F: Reductant System Flow – Restricted
Standardized SAE J2012 code · P2Dxx codes
What does P2D1F mean?
The SCR module detects restricted flow in the reductant system. Pressure rises above expected for the commanded dosing rate.
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 Reductant filter clogged
- Medium Supply line kinked
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2D1F on the same make and model first.
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