Powertrain, generic · Hybrid propulsion

P0CFD Control Pilot Charging Switch A Stuck Off

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Stuck Off means the module commands charging switch A closed, but the pilot does not show the expected effect: the level stays at the connected value of about 9 V instead of dropping to around 6 V, so the station never receives a charge request. Possible are a switch or relay that no longer closes, an open resistor in the 1.3 kΩ branch, or a fault in the pilot measuring path. No manufacturer documents this code publicly; GM's plausibility test P0CF9 on the Chevrolet Volt evaluates the same switch from the pilot voltage during a self-test, and CARB requires the charging system to be monitored on plug-in vehicles. Its opposite is P0CFE, a switch that will not open; circuit faults are P0CF8 to P0CFB. The car is detected at the station and may report that it is plugged in, but charging never starts.

Likely causes

Charging switch or relay in the module no longer closing
Open resistor or solder joint in the 1.3 kΩ branch
Charging module software not issuing the close command correctly

Symptoms

  • Vehicle shows plugged in, but charging never begins
  • Charging station remains in standby or connected state

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,200
Time0.5–3 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

P0CF8P0CF9P0CFAP0CFBP0CFE

References: law.cornell.edu, en.wikipedia.org, gsi.ext.gm.com.