Code result
P263D
Reductant Heater Driver Performance
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Aged driver shows degraded switching behaviour
highOne of the most commonly reported causes for this code — check this first.
Heater element resistance drifted out of range
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P263D freeNo credit card required