P0DF0
Generator Inverter Temperature Sensor B Circuit.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- D
- AreaReserved
- F0
- FaultThe specific fault in that area
What it means
P0DF0 is the generic code for a fault in the Generator Inverter Temperature Sensor 'B' circuit on hybrid and electrified vehicles. The control unit monitors the inverter temperature sensor signal and saw a voltage or reading outside the expected range, or one that did not agree with other temperature data. Which sensor is 'B' and where it sits depends on the model and the hybrid system design.
Symptoms
- Hybrid or powertrain warning light on the dash
- Reduced power or limp mode
- Reduced or no hybrid assist, with the engine running more often
- Cooling fan or inverter coolant pump running harder than normal
- Poorer fuel economy
- Hybrid system may shut down or refuse to enter ready mode
Possible causes
- Wiring or connector fault in the sensor circuit (open circuit, short, corrosion, chafing or loose pin)likely
- Faulty inverter temperature sensor B, which may be built into the inverter assemblypossible
- Inverter cooling problem (low coolant, air in the system, failed inverter coolant pump or blocked radiator) giving a genuinely high temperaturepossible
- Internal fault in the inverter or hybrid control unit that misreads the sensor signalpossible
- Water ingress or contamination at the inverter connectorrare
- Outdated control unit software where the manufacturer has issued a known fix for this coderare
How to diagnose
- Read all stored and pending codes and the freeze frame data. Note any cooling pump, inverter or motor temperature codes that appear alongside this one.
- Check the inverter coolant level and condition, following the manufacturer's procedure. Look for leaks and confirm the coolant pump and fans run when expected.
- Only after following the manufacturer's high-voltage safety and isolation procedure, and only if trained to work on hybrid systems, visually inspect the sensor wiring and connectors for damage, corrosion, moisture and poor pin tension. Orange high-voltage cables and components must not be disturbed by untrained persons.
- With live data, compare the inverter temperature sensor reading with other temperature readings (such as coolant or other inverter sensors) on a cold car. They should be close to each other.
- Watch the live reading while gently moving the harness. Any jump or dropout points to a wiring or connector fault.
- Check the sensor circuit's supply, signal and ground for continuity, shorts and resistance against the manufacturer's data, with the system safely isolated.
- Check for software updates or technical service bulletins for your model and code.
- If the wiring and cooling are sound, test or replace the sensor or inverter assembly as directed by the manufacturer's procedure.
How to fix
- Repair or replace damaged wiring and clean or replace faulty connectors
- Replace the temperature sensor, or the inverter assembly if the sensor is not serviced separately
- Correct inverter cooling faults: top up and bleed the coolant, and repair or replace the pump, hoses or radiator
- Repair or replace the inverter or hybrid control unit if testing shows an internal fault
- Update the control unit software where the manufacturer lists it as a fix for this fault
- Clear the code and road test, then confirm it does not return
Can I keep driving?
The car can usually be driven for a short time, but expect reduced power and hybrid assist. Get it checked soon, and stop driving if the temperature warning shows, the car loses power or the hybrid system shuts down, because an overheating inverter can be damaged.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.