Powertrain, generic

P0E91 Drive Motor B Inverter Voltage Sensor B Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Voltage channel B measuring circuit in the motor B inverter defective
Connector or harness of the motor B inverter loose or damaged
Software fault in the motor B control unit

Symptoms

  • Hybrid or EV warning with MIL
  • Loss of the second drive motor (for example no all-wheel drive), reduced power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–3,500
Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor b inverter voltage sensor bwiring harnesshybrid control module

Related codes

P0E92P0E93P0E94P0E95P0DA3P0E8C

References: law.cornell.edu, mitsubishitechinfo.com.