Powertrain, generic · Hybrid propulsion

P0C7B Generator Inverter Voltage Too High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

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

Symptoms

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

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time0.5–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

generator inverterdc link capacitor

Related codes

P0C79P0C7AP0A7A

References: mitsubishitechinfo.com, mitsubishitechinfo.com, law.cornell.edu.