OBD-II code · Powertrain (generic)
P0A40 Drive Motor A Position Sensor Circuit
Electrical fault on the resolver or encoder used to determine rotor position of drive motor A. Position is essential for vector control commutation.
Is it safe to drive with P0A40?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyResolver failed
- PossibleResolver wiring shielding fault
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Repair at a glance
- Difficulty
- Shop_only
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–12 h
- Emissions test
- Usually unaffected
- Parts involved
- Drive Motor A, Rotor Position Sensor, Resolver
Related codes
- P0A3FDrive Motor A Position Sensor Circuit
- P0A45Drive Motor B Position Sensor Circuit
- P0A3DDrive Motor B Inverter Over Temperature
- P0A3EGenerator Inverter Over Temperature
- P0A41Drive Motor A Position Sensor Range/Performance
- P0A42Drive Motor A Position Sensor Circuit High
- P0A43Drive Motor A Position Sensor Circuit Intermittent
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.