P215FReductant Heater D Current Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P215F is set when heater D of the DEF system pulls more current than its design allows, which points to a partly shorted element or a leak path to ground in its wiring. The letter D is assigned by each maker, and many systems have only three heaters. No maker documents P215F publicly. As a guide, GM's 2025 Duramax tables trip the high-current codes of heaters A to C above 15 A in 40 samples of 0.1 s and treat them as Type A, and Ford's 2023 diesel summary detects an overloaded tank or line heater within 2.2 s. The controller usually switches the faulty element off to protect its driver, so the fluid in that area is no longer heated. Wet connectors, chafed leads and internal shorts are typical. The low-current partner is P215E; circuit faults are P20C5 to P20C8.
- What you may notice
- Check engine light with a DEF or emission system warning
- DEF stays frozen in the affected area during cold weather
- Blown heater fuse in some cases
- Likely causes
- LikelyHeating element D partly shorted internally
- PossibleMoisture or DEF crystals in the heater D connector bridging pins
- PossibleChafed heater lead touching ground or a neighbouring circuit
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.