P0E91Drive Motor B Inverter Voltage Sensor B Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0E91 is the circuit code for the second DC voltage channel, sensor B, in the inverter of drive motor B, usually the second electric machine or the rear axle motor. It applies when this signal is absent or electrically unusable without a more precise verdict; its partner channel A is coded P0DA3, and the matching code for drive motor A is P0E8C. No manufacturer documents P0E91 or its B-sensor siblings for motor B publicly. Mitsubishi illustrates the frame with sensor A of the rear motor on the 2023 Outlander PHEV: the rear motor unit reports its inverter voltage, which the front power electronics compare with their own capacitor values. CARB requires inputs of hybrid drive components to be monitored for circuit faults. Motor B is then usually switched off, and the car may drive with reduced power.
- What you may notice
- Hybrid or EV warning with MIL
- Loss of the second drive motor (for example no all-wheel drive), reduced power
- Likely causes
- LikelyVoltage channel B measuring circuit in the motor B inverter defective
- PossibleConnector or harness of the motor B inverter loose or damaged
- RareSoftware fault in the motor B control unit
- 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: €50 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.