P0DF2
Generator Inverter Temperature Sensor C Circuit.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- D
- AreaReserved
- F2
- FaultThe specific fault in that area
What it means
P0DF2 is a generic powertrain code meaning the control unit has found a fault in the circuit of generator inverter temperature sensor C. This sensor monitors the inverter that controls the generator (or generator-motor) in a hybrid or electric drive system. The code sets when the signal is outside the expected range, stuck, or implausible compared with other temperature readings. The exact sensor location and the circuit fault type (low, high, or performance) depend on the vehicle.
Symptoms
- Hybrid system or powertrain warning light on
- Reduced power or limp-home mode
- Generator or hybrid battery charging reduced or stopped
- Engine running more often than normal on a hybrid, or poorer fuel economy
- Cooling fan or pump for the inverter running constantly
- Hybrid system refusing to start or shutting down in severe cases
Possible causes
- Damaged, chafed or corroded wiring to the inverter temperature sensor C circuit (open circuit, short to earth or short to voltage)likely
- Poor connection or water ingress at the inverter or sensor connectorlikely
- Faulty inverter temperature sensor C, whether internal to the inverter or a separate unitpossible
- Inverter cooling system fault (low coolant, failed pump, blocked flow) causing a genuine over-temperature or implausible readingpossible
- Fault within the inverter or hybrid control unit itselfrare
- Outdated or faulty control unit software where a manufacturer bulletin identifies it as a known causerare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting inverter temperatures and any other hybrid system codes
- Check for related cooling system codes, and inspect the inverter coolant level and condition following the manufacturer's procedure
- Visually inspect the sensor wiring and connectors for chafing, heat damage, corrosion, moisture and bent or pushed-back pins
- Compare live data for all inverter temperature sensors at a cold start; they should read close to ambient and to each other
- Check that the inverter cooling pump and fans operate when commanded
- Test the sensor circuit for supply, signal, earth, continuity and shorts against the wiring diagram, with the high-voltage system made safe by a trained person
- Measure the sensor resistance against the manufacturer's specification if it is accessible separately
- Check for relevant software updates or technical bulletins for the model
How to fix
- Repair or replace damaged wiring and terminals in the sensor circuit
- Clean, dry and refit the connectors, replacing any that are corroded or damaged
- Replace the faulty temperature sensor or inverter assembly if the sensor is not serviced separately
- Correct any cooling system fault, including topping up or bleeding coolant and replacing a failed pump
- Update the control unit software only if a known issue applies to the vehicle
Can I keep driving?
The car may be driveable in reduced-power mode, but the inverter cannot be monitored properly and may overheat, so get it checked soon. Stop driving if warnings for hybrid system overheating appear or power is severely reduced. Work on high-voltage parts should only be done by suitably trained people.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.