P0A49: Drive Motor B Position Sensor Circuit Intermittent
What to do
If the warning tracks wet weather or rough roads, say so — that pattern points at the underfloor harness and saves diagnostic hours.
What this code means
Motor B's rotor angle is dropping out and returning.
Each dropout is a stumble or a brief loss of this motor's drive — on rear-motor cars, a momentary loss of the rear axle's help that is easy to miss until a slippery hill start needs it. Intermittency means harness, and the underfloor run's weather exposure makes wet-day patterns especially telling.
Likely causes
Start here
- Intermittent wiring fault · moderate
- Water ingress into connector · easy
Less common
- Road damage to underfloor wiring · moderate
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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