P0ED3: Hybrid/EV Battery F Voltage High

P0ED3 is logged once battery F of the hybrid/EV system climbs above its permitted maximum voltage. It is the high member of the F series, next to P0ED2 (low) and P0ED1 (unstable). No manufacturer documents P0ED3 publicly. GM's hybrid tables show how strictly overvoltage is treated at pack level: above 479 V the P0ABD monitor fails within one trip. Ford sets P0AFB when its pack stays above 362.2 V on plug-in or 327.8 V on full hybrids for 10 seconds. Within a single unit an excess voltage usually means its cells were charged further than the rest, for instance because the balancing circuit of that unit quit, or that its measuring channel reads high. Charging and regeneration stay restricted until the cause is found; a warning appears and plug-in charging may be refused.

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

Charging refused or regenerative braking weak
MIL and battery warning

Most likely causes

Balancing circuit of unit F failed, cells overcharged
Measuring channel of unit F reading too high
Charger or regeneration control overshooting

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 P0ED3 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
E: Subsystem depends on the code range
D3: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0ED3?

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 P0ED3?

The most common causes are: balancing circuit of unit F failed, cells overcharged; measuring channel of unit F reading too high; charger or regeneration control overshooting.

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.