P0A56: Drive Motor B Current Sensor Circuit Range/Performance
What to do
Often caught silently at power-on. Have the sensor's zero verified before anything larger is discussed.
What this code means
Motor B's current reading is alive but implausible — with the power-on zero check of P0A52 as the usual catcher, and drifted offset as the usual finding.
See P0A52 for why this is the family's wear-out variant, and P0A55 for what stops working meanwhile.
Likely causes
Start here
- Faulty motor current sensor · specialist
- Sensor drifted out of calibration · specialist
Less common
- Corroded or loose connector · easy
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.
- What you measured, not only what you replaced.
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