P0C0A: Drive Motor B Phase U-V-W Circuit High
What to do
As P0C05.
What this code means
The three phase circuits to drive motor B are reading high — the shorts direction, where insulation between phases or to the body is the concern. The reason all three appearing together points at something shared rather than at three faults is at P0C05.
Likely causes
Start here
- Corroded or loose connector · specialist
- Damaged high voltage phase cable or terminal · specialist
- Chafed harness between transaxle and inverter · specialist
Less common
- Faulty power inverter · specialist
- Motor winding insulation breakdown · 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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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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