P0EFE: 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. 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.

Symptoms

• AC charging stops within seconds of starting
• Displayed supply voltage unrealistically high
• Charging fault message

Most likely causes

• Open lower resistor in the voltage divider of channel C
• Sense signal shorted to the converter reference or a supply rail
• Actual overvoltage or surge from the supply

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

What each character of P0EFE means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• E: Subsystem depends on the code range
• FE: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0EFE?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0EFE?

The most common causes are: open lower resistor in the voltage divider of channel C; sense signal shorted to the converter reference or a supply rail; actual overvoltage or surge from the supply.

Related codes

• P0EFDBattery Charger A Input Voltage Sensor C Circuit Low
• P0EFBBattery Charger A Input Voltage Sensor C Circuit
• P0EFCBattery Charger A Input Voltage Sensor C Circuit Range/Performance
• P0EFABattery Charger A Input Voltage Sensor B Circuit High
• P0D40Battery Charger A Input Voltage Sensor A Circuit High

Sources

• gsi.ext.gm.com: 11OBDG01 HYBRID Diagnostics
• ti.com: tidue53j
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.