P0C0D: Drive Motor A Inverter Power Supply Circuit High

P0C0D reports that the supply of the motor A inverter is above its permitted range, while P0C0B stands for a lost or open supply and P0C0C for a supply that is too low. No manufacturer documents this code publicly. GM's tables for the sibling P0C0B show what the supply is: the gate-drive rails of the IGBT module, on eAssist a 5 V and a 15 V rail that are each watched against limits. A rail running too high stresses the driver stage and can falsify the switching of the power transistors. CARB requires hybrid components to be monitored for circuit faults. Expect the inverter to shut down or derate, with reduced or no electric drive.

Symptoms

• Malfunction indicator lamp, hybrid system warning
• Reduced or no electric propulsion from motor A
• Engine runs more often or the vehicle enters limp mode

Most likely causes

• Faulty voltage regulation of the gate-drive supply inside the motor A inverter
• Excessive 12 V system voltage from the DC/DC converter or a 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.

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

Good to know

• It can trigger limp mode.
• It affects emissions.

What each character of P0C0D means

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

Frequently asked questions

Can I keep driving with code P0C0D?

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 P0C0D?

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

Related codes

• P0C0BDrive Motor A Inverter Power Supply Circuit/Open
• P0C0CDrive Motor A Inverter Power Supply Circuit Low
• P0C10Drive Motor B Inverter Power Supply Circuit High
• P0A78Drive Motor A Inverter Performance
• P0D2EDrive Motor A Inverter Voltage Sensor A Circuit Range/Performance

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 13OBDG05C Hybrid Diagnostics
• gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics

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.