P0CFAControl Pilot Charging Switch A Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- Charging switch A shifts the control pilot from the connected state at about 9 V to the charge-request state at about 6 V by switching in an extra 1.3 kΩ path. P0CFA indicates that the control or feedback line of this switch reads too low, typically a harness wire touching ground or a driver stage in the charging module that has failed shorted. No manufacturer documents this code publicly; CARB requires hybrids and plug-ins to monitor the charging system, and GM's Chevrolet Volt checks the same switch only indirectly through P0CF9 by measuring the pilot voltage it causes in a self-test. Depending on the design, a grounded control line can hold the switch permanently closed or permanently open. The high-side fault is P0CFB, the open circuit P0CF8. Charging may then start unexpectedly or not at all.
- What you may notice
- Charging does not start, or starts as soon as the plug is inserted
- Charging fault message in the cluster
- Likely causes
- LikelySwitch control or feedback wire shorted to ground
- PossibleShorted driver stage in the charging control module
- RareCorrosion in the inlet or module connector bridging to ground
- 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.