P0C5A: Drive Motor A Position Sensor Circuit B
What to do
As P0C50 — the two channels are one measurement, so losing either loses the angle. Check wiring and shielding before the sensor.
What this code means
Channel B of the position sensor on drive motor a has a circuit fault.
The two points that make this family readable — that it is not the whole-sensor code at P0A3F, and that channels A and B are the sine and cosine halves of one measurement rather than two independent sensors — are at P0C50.
Likely causes
Start here
- Faulty motor position sensor · specialist
- Corroded or loose connector · easy
Less common
- Chafed harness between transaxle and inverter · specialist
- Failed sensor reference voltage supply · moderate
- Motor position sensor incorrectly fitted or misaligned · 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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- The car — make, model, year and engine. The same fault behaves differently on each.
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