P0C7ADrive Motor B Inverter Voltage Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0C7A is the overvoltage code for the inverter of drive motor B, which on many all-wheel-drive hybrids is the rear motor. Mitsubishi documents it for the Outlander PHEV: in the 2018 model the rear motor control unit has a hardware high-voltage switch that closes at 420 V, a higher limit than the 370 V of the front unit, and the code sets after a single trip with the power stage active or after 0.5 s with it switched off. The manual blames the high-voltage circuit or the rear control unit and starts with the rear battery cable connections; the 2023 model keeps the code under a rear-motor overvoltage name. Regeneration spikes, contactor events and sensing errors are the usual suspects. Expect a warning lamp and reduced drive power.
- What you may notice
- Hybrid or EV warning lamp
- Reduced drive power, rear axle drive may be unavailable
- Likely causes
- PossibleRear battery cable connection loose at the rear motor control unit
- PossibleRear motor control unit or its voltage detection faulty
- PossibleVoltage spike from regeneration or a contactor event
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.