P0EFDBattery Charger A Input Voltage Sensor C Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EFD reports that the reading of input voltage sensor C in charger A sits below its plausible band. No manufacturer documents P0EFD publicly. GM's 2011 Volt charger module gives a reference for sensor A: once AC is detected at the inlet, a peak value under 90 V for 1500 ms within a 1875 ms window sets P0D3F, Type A with the warning lamp after one trip. Causes on the measuring side are a short to ground on the sense path, a shorted lower divider resistor or a missing reference for the converter. A phase that is genuinely dead at the supply, such as a tripped breaker on one leg of a three-phase station, can produce the same picture, so the incoming voltage is measured first. Mains undervoltage proper has its own codes such as P0D27; the high counterpart is P0EFE.
- What you may notice
- AC charging refused right after plugging in
- Charging works on a different station or outlet
- Charging fault message
- Likely causes
- LikelyDefective divider or converter input for channel C in the charger
- PossibleOne phase missing at the supply (tripped breaker or fault in the station or cable)
- PossibleSense path of channel C shorted to ground
- 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.