P0CF4Control Pilot Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0CF4 flags a pilot signal that is electrically present but does not fit what the vehicle expects. GM spells out the test for the Chevrolet Volt (2011-2019, VICM/HPC2): with no cord connected and the car moving at 8 km/h or more, pilot voltage divided by battery voltage must stay below 0.03 and both processor logic states must agree; in a self-test with the internal diagnostic switch closed and the charging and ventilation switches open, the ratio must sit between 0.30 and 0.55. 30 of 50 samples at 100 ms set it as Type A, MIL after one trip; older tables also require the charge door to be closed. FCA names P0CF4-00 together with P0CF3 on the Pacifica Plug-in Hybrid and the Renegade/Compass 4xe and fixes it by reflash. Opens and shorts have their own codes. Charging may fail or be refused.
- What you may notice
- Malfunction indicator lamp on after one trip (GM)
- Charging refused or interrupted
- Charge status indicator shows a fault
- Likely causes
- PossibleFaulty pilot measuring or self-test circuit inside the charging/hybrid control module
- PossibleModule software needing an update (FCA Pacifica and 4xe bulletins)
- PossibleMoisture or dirt in the charge inlet creating a leakage path on the pilot line
- RareCharge door position fault blocking or distorting the test (GM Volt enable condition)
- 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.