P0E90: Drive Motor A Inverter Voltage Sensor B Circuit Intermittent/Erratic

P0E90 is meant for a voltage sensor B signal of the drive motor A inverter that flickers, jumps or drops out for moments without staying wrong long enough for the low or high code. No manufacturer documents P0E90 publicly. The documented siblings show how short the window is: Mitsubishi's 2023 Outlander PHEV flags the same channel (V2M at capacitor 2) as too low or too high only after 0.16 s beyond 0.45 V or 4.75 V, and as implausible after 0.2 s of deviation, so shorter glitches need an extra stability test. CARB asks for input signals to be checked for circuit and rationality faults. In practice a loose low-voltage plug on the inverter, a chafed lead or a solder joint that opens with heat and vibration is the usual cause. Warnings may appear and vanish again.

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 warning that comes and goes
Short power interruptions or jerky electric drive

Most likely causes

Loose or corroded low-voltage connector on the inverter
Chafed or partly broken signal lead
Measuring circuit in the power electronics failing intermittently 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 P0E90 means

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

Frequently asked questions

Can I keep driving with code P0E90?

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 P0E90?

The most common causes are: loose or corroded low-voltage connector on the inverter; chafed or partly broken signal lead; measuring circuit in the power electronics failing intermittently 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.