P0A40Drive Motor A Position Sensor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0A40 means the resolver of motor A still delivers a signal, but its quality is poor or implausible. GM calls this a degraded signal: the sine or cosine value exceeds 4.0 V, judged within 0.2 to 0.4 s of a 2 s window (Type A, one trip in 2016; Type B, two trips on the 2013 mild hybrid). Mitsubishi (2023 Outlander PHEV front motor) sets it when sine or cosine leaves the 2.1 to 2.9 V band for 0.17 s. Audi lists P0A4000 with an implausible signal on the A7 and Q5 e quattro and replaces rotor position sensor G713 after checking gold-plated connector pins; Bentley pairs it with P0C5100/P0C5B00 and inspects connectors for pin drag. P0A3F is the hard signal loss. Expect a drive system warning or no start.
- What you may notice
- Drive system fault message in the instrument cluster
- Vehicle cannot be started or will not enter ready mode
- Electric drive disabled or torque jerks while driving
- Likely causes
- LikelyRotor position sensor (resolver) delivering a degraded signal, e.g. Audi G713
- LikelyWorn, loose or contaminated contacts in the resolver connectors (Audi, Bentley)
- PossibleSensor wires pinched or misrouted on the gearbox housing after a repair
- RareFaulty resolver evaluation in the inverter/motor control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.