P2C11Reductant Pump A Current Too Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2C11 watches the electric motor of the DEF (AdBlue) pump from the other side than P214E: its driver output carries less current than a working motor should draw, which points to an open winding, a poor plug contact or a motor spinning freely or not at all. Only GM documents it publicly, in its 2025 diesel tables (25OBDG04A/B): the DEF control module flags under 0.75 A while the pump is used as a heater for frozen fluid, and under 0.5 A during priming and normal running. Failures over 4 s within 400 samples set it as Type A, so the MIL comes on after one trip, and the code only heals in the next drive cycle. While it is active the pump is stopped, no fluid is dosed and the SCR catalyst loses its NOx conversion; the exhaust fluid warning follows.
- What you may notice
- MIL and exhaust fluid system warning in the instrument cluster
- No DEF consumption, higher NOx emissions
- Speed or restart limitation if the fault persists (inducement)
- Likely causes
- LikelyDEF pump motor with open winding or worn brushes/electronics (pump module in the tank)
- PossibleLoose, corroded or spread terminals at the pump connector
- PossibleOpen or high-resistance control or low-reference wire between control module and pump
- RareFaulty output stage in the DEF control module
- 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 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.