P0CFBControl Pilot Charging Switch A Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P0CFB is the high-side counterpart: the control or feedback line of charging switch A, which loads the pilot with an extra 1.3 kΩ to request charging, shows a voltage above its valid band. Typical are a short to a supply voltage in the harness or connector, or an output stage in the charging module that no longer pulls the line down. No manufacturer documents this code publicly; the closest documented test is GM's P0CF9 on the Chevrolet Volt, which judges the switch by the pilot voltage it produces in a self-test (ratio 0.14-0.28), while CARB requires plug-in vehicles to monitor the charging system. Low readings are P0CFA, an open line P0CF8, dropouts P0CFC. For the driver the station typically stays in the plugged-in state without supplying power, or a session cannot be ended cleanly.
- What you may notice
- Vehicle detected at the station but no energy flows
- Charging cannot be stopped normally
- Likely causes
- LikelySwitch control or feedback wire shorted to a supply voltage
- PossibleOutput stage in the charging module no longer switching to ground
- RareLost ground at the switch letting the line float high
- 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.