P0DF1
Generator Inverter Temperature Sensor B Circuit Intermittent/Erratic.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- D
- AreaReserved
- F1
- FaultThe specific fault in that area
What it means
P0DF1 is a generic powertrain code meaning the control unit has seen an intermittent or erratic signal from generator inverter temperature sensor B. The signal has dropped out, jumped or changed implausibly quickly compared with the other temperature sensors or the expected thermal behaviour. This code applies to hybrid and electric vehicles, and the exact location of sensor B depends on the model.
Symptoms
- Hybrid or powertrain warning light on
- Reduced power or limited hybrid assist
- Reduced regenerative braking or charging
- Cooling fan or pump for the power electronics running harder than normal
- Intermittent fault that comes and goes with vibration or temperature
- Vehicle going into limp mode or failing to enter ready mode
Possible causes
- Loose, corroded or damaged connector at the inverter temperature sensorlikely
- Chafed, stretched or intermittently open-circuit wiring in the sensor circuitlikely
- Failing generator inverter temperature sensor B giving an erratic readingpossible
- Moisture or coolant contamination in the connector or inverter housingpossible
- Fault within the inverter assembly or its internal sensing circuitpossible
- Faulty control unit input circuit or outdated software, if a known issue exists for the modelrare
How to diagnose
- Read all stored and pending codes and note the freeze frame data, including the temperature reading and vehicle conditions when the fault set.
- Check for related codes on other inverter, motor or coolant temperature sensors, as these point towards a shared fault.
- Follow the manufacturer's high-voltage safety procedure before any work near the inverter, and only proceed if qualified to work on high-voltage systems.
- Inspect the sensor wiring and connectors for damage, corrosion, moisture, bent pins and poor terminal tension.
- With live data, watch sensor B temperature while gently wiggling the harness and compare it with the other inverter and coolant temperatures for sudden jumps or dropouts.
- Check the power electronics cooling system for correct coolant level, pump operation and airflow, as an overheating inverter can mimic sensor faults.
- Test the sensor circuit for resistance, continuity, short to earth and short to supply against the manufacturer's specification.
- Check for technical service information or software updates relevant to the model and fault code.
How to fix
- Repair or replace damaged wiring and clean or renew corroded or loose connector terminals.
- Replace the generator inverter temperature sensor if testing confirms it is faulty, where it is serviceable separately.
- Dry out and seal the affected connector and correct the source of any moisture or coolant leak.
- Repair or replace the inverter assembly if the sensor is integral and has failed.
- Top up or repair the inverter cooling system if poor cooling is found.
- Apply a manufacturer software update only if an outdated calibration is a known cause for that model.
Can I keep driving?
The car may be driven carefully for a short time, but power may be reduced and the inverter may not be protected properly if temperature is misread. Get it diagnosed soon, and stop driving if a red warning appears or the car loses drive.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.