What it means
The ECM detects a circuit fault on the generator inverter temperature sensor c circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Temperature sensor C monitors a temperature in the generator inverter, which controls electrical power from the motor-generator. The control module checks sensor C's circuit so it can use that temperature in system control. This code indicates a circuit fault has made the reading unreliable, and the vehicle may reduce power to protect the inverter.
Common causes
Most likely first.
- Sensor failed
- Wiring or connector fault
Symptoms
- Hybrid/EV system warning light on
- Power may be reduced if the inverter temperature cannot be monitored reliably
How to diagnose it
- Save freeze-frame data and read generator inverter temperature sensor C data with any related inverter or hybrid-system codes.
- With the vehicle powered down according to service information, inspect sensor C's connector and harness for looseness, corrosion, heat damage, or chafing.
- Check that sensor C's connector is fully seated and its pins are not bent, pushed back, or contaminated.
- Test sensor C's circuit and sensor response using the manufacturer's wiring diagram and specification to identify whether the fault is in the sensor or wiring.
- If sensor C and its wiring pass, check the module connections and input using the manufacturer's procedure.
Common fixes
- Reconnect or repair loose, damaged, or corroded sensor C wiring and terminals.
- Repair a damaged section of the sensor C harness.
- Replace generator inverter temperature sensor C if its circuit or readings fail the manufacturer's specification.
- Repair the module connection or input only if testing confirms it is at fault.
Can I keep driving?
If power is reduced or an inverter warning appears, avoid hard acceleration, towing, and long trips because the system may not be able to assess generator inverter temperature reliably. Stop if power loss is severe or a high-voltage warning appears.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.