What it means
The ECM detects a circuit low fault on the drive motor 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
Drive motor inverter temperature sensor C monitors temperature at a specific point in the drive motor inverter for motor control and heat protection. This code sets when the sensor C circuit voltage falls below its expected range, commonly because the signal is shorted to ground or the sensor is internally shorted.
Common causes
Most likely first.
- Signal wire shorted to ground
- Internal sensor short
- Connector pins corroded - high contact resistance
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Capture freeze-frame data and compare sensor C live temperature with other drive motor inverter readings to confirm the signal is unusually low.
- With the vehicle powered down as specified by the manufacturer, inspect the sensor C connector for corrosion, damaged pins, or a loose connection.
- Inspect the sensor C signal wire for chafing or contact with ground, particularly around the inverter and connector.
- Test the sensor C circuit for a short to ground and check its ground reference using the manufacturer's wiring information.
- Test the sensor C element against the manufacturer's specification and verify the reading after the confirmed fault is repaired.
Common fixes
- Clean and secure corroded or loose sensor C connector terminals where repair is appropriate.
- Repair the sensor C signal wire if it is shorted to ground or damaged.
- Replace drive motor inverter temperature sensor C if it tests internally shorted.
- Recheck live temperature data and clear the code after repair.
Can I keep driving?
Avoid hard acceleration and heavy loads because the vehicle may limit drive motor power or enter limp mode. If power drops sharply or a shutdown warning appears, stop safely; an unreliable sensor signal can prompt protective operation.
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.