P0EF8Battery Charger A Input Voltage Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0EF8 is set when input voltage sensor B of charger A delivers a value that is electrically valid but wrong for the situation. No manufacturer documents P0EF8 publicly. GM's rationality test for sensor A, P0D3E in its 2019 plug-in hybrid tables, illustrates the idea: while the car moves at 16 km/h or more, when no plug can be connected, the sensor duty ratio must stay between 8 and 12 %; if 60 of 80 samples taken every 25 ms fall outside, the code is stored as Type B. A charger with two input channels can additionally compare them with each other or with the supply voltage reported by the station. Offset drift or a partial fault in the sensing electronics is the likely cause, wiring less so. Charging may stop or continue at reduced power.
- What you may notice
- AC charging interrupted or slower than expected
- Code may set while driving without any charging attempt
- Charging fault message
- Likely causes
- LikelyOffset drift of the voltage sensing electronics in the charger
- PossiblePartial internal fault of the charger input stage
- RareCharger software misjudging the plausibility window
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.