P0CF8Control Pilot Charging Switch A Circuit/Open
- Generic OBD-II code · Powertrain
- How the car detects it
- On the vehicle side the pilot is loaded permanently by about 2.7 kΩ, which drops the station's +12 V to roughly 9 V once a cable is connected. To ask for energy the vehicle closes charging switch A, often called S2, which adds a 1.3 kΩ branch and brings the level to about 6 V, the state in which the station closes its contactors. P0CF8 reports that the control circuit of this switch is open, so the module cannot operate it. No manufacturer documents this code publicly; GM tests the same switch on the Chevrolet Volt only for plausibility (P0CF9, normalized pilot voltage 0.14-0.28 in a self-test), and CARB requires plug-in vehicles to monitor charging system function. Shorts are P0CFA/P0CFB, a switch that will not close is P0CFD. Expect a car the station recognises that still never starts charging.
- What you may notice
- Station detects the vehicle but charging never begins
- Charging fault message after plugging in
- Likely causes
- PossibleOpen control wire or loose connector between module and charging switch
- PossibleCharging switch or its 1.3 kΩ branch open inside the module or inlet electronics
- RareFailed driver stage in the charging control module
- 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.