P0EFEBattery Charger A Input Voltage Sensor C Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EFE is stored when channel C of charger A reports more input voltage than a household or station supply can deliver. No manufacturer documents P0EFE publicly. For sensor A, GM's 2011 Volt charger module trips P0D40 when the measured AC peak exceeds 422 V for 160 ms of a 200 ms window, rated Type A; this window is far shorter than the one for the low code, presumably because overvoltage endangers the input stage. In a divider front end like the one in TI's 11 kW design, an open lower resistor or a short to the converter reference pushes the signal toward the 3.3 V limit and causes exactly this reading. Real overvoltage from the grid is rare, so the measuring channel inside the charger is the main suspect once plugs have been checked. AC charging stops at once.
- What you may notice
- AC charging stops within seconds of starting
- Displayed supply voltage unrealistically high
- Charging fault message
- Likely causes
- LikelyOpen lower resistor in the voltage divider of channel C
- PossibleSense signal shorted to the converter reference or a supply rail
- RareActual overvoltage or surge from the supply
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.