P0DF9: Generator Inverter Temperature Sensor C Circuit High

P0DF9 is stored when the C temperature sensor of the generator inverter reports a voltage at or beyond the upper end of its window. For the Outlander PHEV Mitsubishi defines the limit as 3.75 V for 0.08 s on the W-phase high-side IGBT sensor, monitored continuously whenever the GCU has at least 8 V. An open line, a backed-out terminal in the inverter connector or a broken sensor element are the usual explanations. Unlike a real cold start, the reading does not climb as the generator works, which separates the fault from a true low temperature. Generator power may be held back until the value is valid again, and Mitsubishi fixes it by replacing the complete power drive unit. Too low a voltage on the same sensor is P0DF8; the B-sensor counterpart is 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

Engine or hybrid warning light on
Inverter temperature stuck at a very low value
Generator output held back

Most likely causes

Open signal line of sensor C
Terminal pushed back in the inverter connector
Broken sensor element inside the power drive 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
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
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 P0DF9 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
D: Subsystem depends on the code range
F9: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0DF9?

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 P0DF9?

The most common causes are: open signal line of sensor C; terminal pushed back in the inverter connector; broken sensor element inside the power drive 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.