P0C0E: Drive Motor B Inverter Power Supply Circuit/Open

P0C0E is the motor B counterpart of P0C0B: the inverter for the second motor has lost the supply of its gate-drive board. GM documents it on the Volt and the two-mode trucks. The IGBT module reports a bias fault through its status line when the supply of phase A, B or C fails. The 2011 Volt checks with high voltage above 100 V, the 2012 trucks with run/crank voltage between 9.5 and 18 V, both after one count, Type A. The 2016 Volt needs 0.002 s of fault in a 0.024 s window, the 2018 table 0.02 s, the 2019 table 0.168 s, always Type A, one trip. P0C0F and P0C10 cover low and high supply. Motor B can no longer be driven, so propulsion is reduced.

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 after one drive
Reduced propulsion message, motor B unavailable
Engine runs continuously instead of electric driving

Most likely causes

Failed gate-drive power supply inside the motor B inverter
Weak 12 V feed, blown fuse or poor ground at the inverter control board
Loose or corroded low-voltage connector at the power inverter module

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 continuity of the wire between the component and the control module.
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 P0C0E means

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

Frequently asked questions

Can I keep driving with code P0C0E?

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 P0C0E?

The most common causes are: failed gate-drive power supply inside the motor B inverter; weak 12 V feed, blown fuse or poor ground at the inverter control board; loose or corroded low-voltage connector at the power inverter module.

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.