What it means
The control module detects an intermittent or erratic signal in the drive motor inverter temperature sensor A circuit.
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 A reports the temperature of a monitored area in the inverter. The control module watches for a stable signal; this code sets when sensor A's reading drops out or changes erratically, often because of an intermittent connector or ground connection.
Common causes
Most likely first.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Review freeze-frame and fault history data, then watch sensor A's live temperature for dropouts while comparing it with other available inverter readings.
- With the vehicle powered down as specified by the manufacturer, inspect and reseat sensor A's connector, checking for loose pins, corrosion, moisture, or harness strain.
- Inspect sensor A wiring and ground reference for damage or poor connections using the manufacturer's wiring information.
- Use the manufacturer's approved method to check whether gentle harness movement causes sensor A's signal to change or drop out.
- Test sensor A and its circuit for stable operation against the manufacturer's specification, and check for related inverter or cooling system faults.
Common fixes
- Reseat and secure sensor A's connector.
- Repair loose, corroded, or damaged connector terminals and wiring.
- Repair a poor ground reference affecting sensor A.
- Replace sensor A if its signal remains erratic with a sound circuit.
Can I keep driving?
Avoid high-load driving while the warning or power limitation comes and goes. A sudden signal dropout can trigger motor power reduction or shutdown, so stop safely if propulsion becomes unreliable.
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.