OBD-II code · Powertrain (generic, extended)
P202D Reductant Leakage
A leak has been detected in the DEF (urea) supply system — usually by a pressure-decay test after pump shutdown, or by visible crystallisation around fittings.
Is it safe to drive with P202D?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyCracked DEF line or fitting
- PossiblePump seal leaking
- PossibleInjector mounting seal leaking
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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Supply Line, Reductant Pump, Reductant Injection Valve
Related codes
- P202AReductant Tank Heater Control Circuit/Open
- P202BReductant Tank Heater Control Circuit Low
- P202CReductant Tank Heater Control Circuit High
- P202EReductant Injection Valve Circuit Range/Performance (Bank 1 Unit 1)
- P202FReductant/Regeneration Supply Control Circuit Range/Performance
- P2030Fuel Fired Heater Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.