OBD-II code · Powertrain (generic)
P0A4A Drive Motor B Position Sensor Circuit Overspeed
The drive motor B rotor position sensor reports a circuit overspeed fault. Phase commutation cannot be controlled reliably.
Is it safe to drive with P0A4A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyRotor position out of expected range
- PossiblePosition signal lost - default to overspeed indication
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–8 h
- Emissions test
- Usually unaffected
- Parts involved
- Drive Motor B Position Sensor, Wiring Harness, Hybrid Control Module
Related codes
- P0A44Drive Motor A Position Sensor Circuit Overspeed
- P0A47Drive Motor B Position Sensor Circuit Low
- P0A48Drive Motor B Position Sensor Circuit High
- P0A49Drive Motor B Position Sensor Circuit Intermittent
- P0A4BGenerator Position Sensor Circuit
- P0A4CGenerator Position Sensor Circuit Range/Performance
- P0A4DGenerator Position Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.