Powertrain, generic · Hybrid propulsion

P0CFE Control Pilot Charging Switch A Stuck On

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Stuck On describes a charging switch A that stays closed while the module wants it open, so the pilot keeps signalling a charge request. Mercedes-Benz documents P0CFE00 in the AC charger N83, whose fault text states that the charger’s internal charge-start switch does not open. A 2023 bulletin for models 206, 223 and 243 reports it after charging has finished or at the start of a timed-charging pause, only with pre-entry climate control active, together with a charging error message in the cluster; NHTSA's index lists the same bulletin for many Mercedes plug-in and electric models up to 2026. The cause there is software, cured by SCN coding, and the bulletin advises against replacing parts. Its counterpart is P0CFD, circuit faults are P0CF8 to P0CFB. Charging may not end properly or is aborted.

Likely causes

On-board charger software, cured by SCN coding (Mercedes-Benz N83)
Charging switch or relay contacts sticking closed
Control line fault holding the switch permanently on

Symptoms

  • Charging error message in the instrument cluster after charging
  • Charging aborts at home socket, wallbox or public station
  • Fault appears mainly with pre-entry climate control active (Mercedes-Benz)

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–300
Time0.5–1.5 h

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

Parts involved

control pilot switch awiring harnesson board charger

Related codes

P0CF8P0CF9P0CFAP0CFBP0CFD

References: static.nhtsa.gov, en.wikipedia.org, law.cornell.edu.