P0C7A: Drive Motor B Inverter Voltage Too High
What to do
As P0C79.
What this code means
The DC link voltage at drive motor B's inverter has exceeded its limit.
Why the DC link can rise above pack voltage, and why the response is a hard cut rather than a derate, are at P0C79. On motor B this presents as all-wheel drive being withdrawn abruptly.
Likely causes
Start here
- Faulty battery contactor · specialist
- Faulty power inverter · specialist
Less common
- Charging system overvoltage · specialist
- Corroded or loose connector · specialist
- Weak or failed cell group in the battery pack · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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