P0A46: Drive Motor B Position Sensor Circuit Range/Performance
What to do
Harness and shielding first — this is the variant where healthy resolvers get replaced. See P0A45 for what stops working meanwhile.
What this code means
Motor B's rotor angle is electrically alive but implausible — jumping, sticking or contradicting the motor's behaviour.
P0A40's reasoning on the second motor: degraded signals skew the computed angle while every wire still conducts, so this is a harness-and-shielding diagnosis before it is a sensor one. Underfloor exposure applies on rear-motor cars, as at P0A45.
Likely causes
Start here
- Road damage to underfloor wiring · moderate
- Corroded or loose connector · easy
Less common
- Damaged sensor cable shielding · moderate
- Faulty motor position sensor · 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
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
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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