P0C10: Drive Motor B Inverter Power Supply Circuit High

P0C10 flags a supply of the motor B inverter that is above its permitted range. Its siblings are P0C0E for a lost or open supply and P0C0F for a low one; P0C0D is the motor A version. No manufacturer documents P0C10 publicly. GM uses only the open-circuit code P0C0E for this supply and describes it as the power feed of the gate-drive board, monitored through the status line of the IGBT module. An overvoltage on that rail can damage the driver circuits, so the controller shuts the inverter down. CARB requires hybrid components to be checked for circuit faults. Expect a warning lamp and loss of the electric drive provided by motor B.

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

Malfunction indicator lamp, hybrid system warning
Reduced propulsion, motor B unavailable
Vehicle limited to engine or reduced-power operation

Most likely causes

Faulty voltage regulation of the gate-drive supply inside the motor B inverter
Excessive 12 V system voltage from the DC/DC converter or an external charger
Supply or sense line shorted to a higher voltage in the harness

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 P0C10 means

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

Frequently asked questions

Can I keep driving with code P0C10?

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 P0C10?

The most common causes are: faulty voltage regulation of the gate-drive supply inside the motor B inverter; excessive 12 V system voltage from the DC/DC converter or an external charger; supply or sense line shorted to a higher voltage in the harness.

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.