OBD-II code · Powertrain (generic, extended)
P263D Reductant Heater Driver Performance
The reductant (AdBlue) tank or line heater driver does not switch as expected. AdBlue may freeze in cold weather, blocking SCR dosing.
Is it safe to drive with P263D?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyAged driver shows degraded switching behaviour
- PossibleHeater element resistance drifted out of range
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
- 1.5–5 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Heater, Reductant Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.