Powertrain
Definition only
Lights the check engine lamp
P263D: Reductant Heater Driver Performance
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P263D mean?
The reductant (AdBlue) tank or line heater driver does not switch as expected. AdBlue may freeze in cold weather, blocking SCR dosing.
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 Aged driver shows degraded switching behaviour
- Medium Heater element resistance drifted out of range
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P263D on the same make and model first.
P263D in the community
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