P0EFE code meaning
Battery Charger A Input Voltage Sensor C Circuit High
What P0EFE means
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.
P0EFE at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0EFE
- AC charging stops within seconds of starting
- Displayed supply voltage unrealistically high
- Charging fault message
Common causes of P0EFE
- Most likelyOpen lower resistor in the voltage divider of channel C
- PossibleSense signal shorted to the converter reference or a supply rail
- Less likelyActual overvoltage or surge from the supply
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery charger a input voltage sensor cWiring harnessOn board charger
What each part of P0EFE means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| FE | The exact fault in that area. |
What to do next
- Note P0EFE and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0EFE
What does P0EFE mean?
P0EFE means "Battery Charger A Input Voltage Sensor C Circuit High". P0EFE is stored when channel C of charger A reports more input voltage than a household or station supply can deliver. It is a generic code, so it means the same on every make.
Is it safe to drive with P0EFE?
P0EFE does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0EFE fail an emissions test?
P0EFE is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0EFE to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P0EFE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.