P263DReductant Heater Driver Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- DEF turns solid at about -11 °C, so SCR systems heat the tank, pump and lines electrically. P263D concerns the power stage that switches these heaters rather than a heater element. On Ford's 6.7 L Power Stroke the heaters are switched by the glow plug module; the plausibility test runs once per trip at peak heater power and sets P263D when the driver circuits exceed 125 °C. Element faults are separate (P20BA, P20BE heater A/B performance, P20C2 heater C supply below 5 V). Deutz uses P263D-00 differently on its EMR engine controllers, namely when defrosting the AdBlue system fails. If the fluid cannot thaw, dosing starts late or not at all, NOx rises and the SCR warning sequence toward a speed or power limit can begin.
- What you may notice
- Check engine light and DEF/SCR warning
- DEF not thawing in cold weather, dosing delayed
- Countdown to speed or power limitation possible
- Likely causes
- LikelyHeater power stage overheating from excessive load current
- PossiblePartially shorted heater element or wiring drawing too much current
- PossibleInternal fault of the module that drives the heaters
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.