P0E4C: Hybrid/EV Battery Pack Voltage Sense F Circuit High

P0E4C means pack voltage measurement F reports a value above anything the battery can produce. Common reasons are a sense line in contact with a higher potential, a lost ground reference in the measuring circuit or a faulty analog input, so the channel rather than the cells is suspect. No manufacturer documents P0E4C publicly. In GM's 2019 hybrid tables the channel A code P0ABD sets above 479 V, again 1.6 s within 2 s and Type A. CARB requires battery voltage sensors to be checked against upper and lower limits. Real overvoltage of single cells is reported by cell voltage codes such as P0DE7, while the low fault of channel F is P0E4B and the same high fault on channel E is P0E47. The controller usually blocks or limits electric operation.

High severity. Can I keep driving?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.

Symptoms

Warning lamp and limited electric drive
Charging interrupted or not started

Most likely causes

Channel F sense line touching a higher potential
Lost ground reference or broken divider in the measuring circuit
Faulty analog input or software of the battery controller

What to check, in order

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

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

Good to know

It can trigger limp mode.
It affects emissions.

What each character of P0E4C means

P: Powertrain: engine and transmission
0: Generic code: same on every make
E: Subsystem depends on the code range
4C: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0E4C?

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 P0E4C?

The most common causes are: channel F sense line touching a higher potential; lost ground reference or broken divider in the measuring circuit; faulty analog input or software of the battery controller.

Related codes

Sources

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.