P0DF4: Generator Inverter Temperature Sensor B Circuit Range/Performance

P0DF4 reports that temperature sensor B of the generator inverter delivers an electrically valid signal whose value does not fit the other sensors. Mitsubishi documents the check for the Outlander PHEV: a single time in each drive cycle, following at least 600 s of standstill and with the IGBTs switched off, the V-phase high-side sensor may not differ by more than 47 °C from the other two phase sensors for 0.1 s; otherwise P0DF4-00 is stored and the power drive unit is replaced. Volvo lists ECM P0DF400 for 2022-on T8 plug-in hybrids and warns it can be misdetected, showing Propulsion System Service Required; for builds from week 202147 to 202446 ECM software 3.4.4 cures it. Out-of-range signals are P0DF5 and P0DF6.

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

Message such as Propulsion System Service Required
Engine warning light on
Turtle symbol and reduced power in some cases

Most likely causes

Control software misdetection (Volvo T8, ECM update available)
Sensor in the power module drifted or stuck at one value
Internal fault in the power drive unit (Mitsubishi replaces the unit)

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
Compare the reading with other engine data while varying the engine speed.
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 P0DF4 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
D: Subsystem depends on the code range
F4: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0DF4?

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 P0DF4?

The most common causes are: control software misdetection (Volvo T8, ECM update available); sensor in the power module drifted or stuck at one value; internal fault in the power drive unit (Mitsubishi replaces the unit).

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.