OBD-II code · Powertrain (generic, extended)
P2D1E Reductant System Leak Detected – Large Leak
The SCR module detects a large leak in the reductant system. Pressure cannot be maintained for dosing operations.
Is it safe to drive with P2D1E?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyReductant supply line disconnected or split
- PossibleTank seal failed
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
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Reductant Lines, Reductant Injector, Reductant Pump, Scr Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.