P0EF7Battery Charger A Input Voltage Sensor B Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EF7 stands for an electrical fault in the second input voltage sensor of on-board charger A, the measuring channel that reads the AC supply voltage coming from a wallbox, station or household outlet. Chargers designed for several phases or split-phase supply may carry more than one such channel; the first one, sensor A, uses P0D3D to P0D41. This general code applies when the signal is unusable but not classified as range, low or high, which are P0EF8, P0EF9 and P0EFA. No manufacturer documents P0EF7 publicly. In its 2019 plug-in hybrid tables GM reads sensor A through a pulse duty ratio, so a broken line shows up as a stuck 0 % or 100 %. CARB requires plug-in vehicles to monitor charging system performance. As long as the supply voltage cannot be confirmed, AC charging is refused or limited.
- What you may notice
- AC charging does not start or stops shortly after start
- Charging fault message in the cluster or app
- DC fast charging usually unaffected
- Likely causes
- LikelyFault in the voltage sensing stage inside the charger
- PossibleOpen or high-resistance signal line between sensor and controller
- RareCorroded low-voltage connector at the charger
- 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.