Powertrain, generic · Hybrid propulsion

P0D31 Drive Motor A Inverter Voltage Sensor A Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0D31 covers a voltage signal from the drive motor A inverter that drops out or jumps for brief moments without staying out of range long enough for P0D2F or P0D30. No manufacturer documents this code publicly. Related checks show the time scale: Mitsubishi rates the same sensor as failed only after 0.16 to 0.3 s outside its window, so shorter glitches need a separate test. Denso describes comparing the measured inverter input voltage with a value estimated from the motor control loop, which also exposes a signal that jitters. Likely triggers are a loose low-voltage connector at the inverter, a chafed harness, or a sensing circuit in the power electronics that fails with heat or vibration. CARB requires such input signals to be checked for circuit faults and rationality. The hybrid warning may come and go.

Likely causes

Loose or corroded low-voltage connector at the inverter
Chafed signal wiring with intermittent contact
Sensing circuit in the power electronics fails with heat or vibration

Symptoms

  • Hybrid system warning that comes and goes
  • Brief power loss or jerky electric drive

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 a inverter voltage sensor awiring harnesshybrid control module

Related codes

P0D2DP0D2EP0D2FP0D30P0E93P0DA7

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