Powertrain, generic (extended)

P2C11 Reductant Pump A Current Too Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

DEF pump motor with open winding or worn brushes/electronics (pump module in the tank)
Loose, corroded or spread terminals at the pump connector
Open or high-resistance control or low-reference wire between control module and pump
Faulty output stage in the DEF control module

Symptoms

  • 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)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,800
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

reductant pump awiring harnessscr module

Related codes

P214EP208AP208BP208CP208DP20E8

References: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.