P0A3FDrive Motor A Position Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The rotor position of a traction motor is read by a resolver: one excitation coil and two pickup coils that return sine and cosine signals. P0A3F is the basic circuit code for motor A and mostly means the signal is gone. GM sets it when the sine or cosine amplitude drops below 2.3 V (Type A, one trip in the 2011 and 2016 tables); Mitsubishi (2023 Outlander PHEV front motor) watches the excitation voltage and fails it outside 1.0 to 2.86 V for 0.14 s. Field causes: a spread terminal at the X2 connector of the Chevrolet Bolt, low 12 V supply on the 2014 Subaru XV Crosstrek Hybrid (software fix), Stellantis Pacifica Hybrid. P0A40 covers a degraded signal. Expect lost propulsion or no electric drive.
- What you may notice
- Sudden loss of propulsion, sometimes normal again after a restart
- MIL and hybrid/EV system warning on
- Vehicle will not enter ready mode or electric drive is disabled
- Likely causes
- LikelySpread or poorly seated terminal at the resolver connector (documented on the Chevrolet Bolt)
- PossibleOpen or shorted excitation, sine or cosine wire between motor and inverter
- PossibleLow 12 V auxiliary battery voltage disturbing the motor control module (Subaru, fixed by reprogramming)
- RareResolver coil failed inside the motor
- RareFaulty resolver excitation or input stage 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: €150 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.