P0A46Drive Motor B 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
- P0A46 reports that the motor B resolver still delivers a signal, but one that is degraded or not plausible. GM uses the same check as P0A40 for its second motor: sine or cosine above 4.0 V, with a failure counted when it persists for 0.2 to 0.4 s of a 2 s window (Type A, one trip in the 2011 and 2016 tables). Mitsubishi (2023 Outlander PHEV rear motor) sets P0A46 when its internal resolver status words A, B or C stay failed for 0.18 s, and replaces the rear motor assembly. A GM-related patent explains the idea: a degraded signal shows as a large mismatch between sine and cosine amplitudes. P0A45 is a full signal loss. Expect a hybrid warning and loss of motor B drive.
- What you may notice
- Hybrid system warning and MIL
- Rear or second motor disabled, reduced traction or power
- Jerky torque delivery before the fault sets
- Likely causes
- LikelyResolver of motor B delivering unequal or distorted sine/cosine signals
- PossibleHigh contact resistance or moisture in the resolver connector
- PossibleFault inside the rear motor assembly incl. bearing damage (Mitsubishi)
- RareDamaged shielding letting inverter noise into the resolver lines
- 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 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.