Powertrain
Definition only
Lights the check engine lamp
P2D1E: Reductant System Leak Detected – Large Leak
Standardized SAE J2012 code · P2Dxx codes
What does P2D1E mean?
The SCR module detects a large leak in the reductant system. Pressure cannot be maintained for dosing operations.
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 supply line disconnected or split
- Medium Tank seal failed
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2D1E on the same make and model first.
P2D1E in the community
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