P0C7B: Generator Inverter Voltage Too High

P0C7B sets when the inverter of the generator, the motor-generator the engine drives to make electricity, sees DC voltage above its limit. Mitsubishi is the only maker found documenting the code by number: in the 2018 Outlander PHEV the generator control unit trips a hardware high-voltage switch at 370 V, and one occurrence with the power stage running, or 0.5 s with it switched off, is enough. The manual suspects the high-voltage wiring as a whole or the generator control unit, and first asks to rule out other voltage codes and to check the tightening torque of the front battery cable at the power drive unit. Overvoltage while generating may also follow a contactor opening under load or false sensing. Expect a warning lamp and limited hybrid operation.

Symptoms

• Hybrid or EV warning lamp
• Engine-driven charging or hybrid drive restricted

Most likely causes

• Front battery cable at the power drive unit not at specified torque
• Generator control unit or its voltage detection faulty
• Voltage spike when a contactor opens while the generator charges

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 P0C7B means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• C: Subsystem depends on the code range
• 7B: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0C7B?

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 P0C7B?

The most common causes are: front battery cable at the power drive unit not at specified torque; generator control unit or its voltage detection faulty; voltage spike when a contactor opens while the generator charges.

Related codes

• P0C79Drive Motor A Inverter Voltage Too High
• P0C7ADrive Motor B Inverter Voltage Too High
• P0A7AGenerator Inverter Performance

Sources

• mitsubishitechinfo.com: M154933610004100USA
• mitsubishitechinfo.com: M154930060023800USA
• law.cornell.edu: 13 CCR 1968.2

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.