What it means
The signal from drive motor A inverter voltage sensor A is above the expected electrical range. The reading may be unreliable.
At a glance
- The engine or gearbox may go into limp mode
How it works
Drive motor A inverter voltage sensor A supplies a voltage-related signal used by the control system for inverter A and drive motor A. This high-circuit code sets when the signal rises above its expected electrical range, which may result from a signal short to battery voltage or an open sensor circuit.
Common causes
Most likely first.
- Signal wire shorted to B+
- Open sensor
- 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
- Record freeze-frame data and live readings for sensor A and related inverter voltage values to confirm the high signal condition.
- Inspect sensor A's wiring and connector for a signal wire contacting battery voltage, corrosion, loose pins, or a disconnected sensor.
- Using the wiring diagram, check for an open in the sensor circuit and inspect connector terminal fit, following the manufacturer's procedures.
- Test the signal wire for a short to battery voltage and check the circuit reference and ground as specified for the vehicle.
- If wiring and terminals pass, test sensor A for an internal open and replace it only if the specified tests confirm failure.
Common fixes
- Repair a signal wire shorted to battery voltage.
- Reconnect sensor A or repair an open in its circuit.
- Repair corroded or loose connector terminals that disrupt the circuit.
- Replace drive motor A inverter voltage sensor A if it fails the manufacturer's tests.
Can I keep driving?
The vehicle may reduce motor power, enter limp mode, or shut down. Avoid trips where loss of drive could create a hazard, and stop safely if a severe warning or power loss occurs.
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.