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

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.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Gently move the wiring with the engine running and watch whether the reading changes.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

It can trigger limp mode.
It affects emissions.

What each character of P0D31 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
D: Subsystem depends on the code range
31: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0D31?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0D31?

The most common causes are: 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.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.