P0A4ADrive Motor B Position Sensor Circuit Overspeed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0A4A reports that the speed calculated from the motor B resolver exceeds the motor's permitted maximum. Mitsubishi uses it for the rear motor of the 2023 Outlander PHEV: set at 12,500 rpm or more for at least 1 s with supply above 8 V, and only judged once the rear position sensor codes P0A45, P0A46, P0C57, P0C58, P0C61 and P0C62 are ruled out; otherwise the rear motor assembly is replaced, bearing damage being one listed cause. GM uses its own code P1B0E (above 11,500 rpm, Type A) for this check on the second motor of its two-mode trucks. CARB 1968.2 requires monitoring of electric drive components. P0A44 is the motor A twin. Expect the rear motor to be shut off to protect it, with less traction.
- What you may notice
- Rear electric drive shut off, front-wheel drive only
- Hybrid/EV warning and MIL
- Reduced acceleration in limp mode
- Likely causes
- PossibleFault in the rear motor assembly, e.g. damaged bearing or control unit (Mitsubishi)
- PossibleReal overspeed from rear wheel spin on low grip
- PossibleDisturbed resolver signal producing a false speed value
- 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: €100 – €7,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.