What it means
The signal from drive motor A inverter voltage sensor A is outside the expected range or performance criteria. 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 reports a voltage-related value used by the control system to manage inverter A and drive motor A. This range/performance code means the signal does not behave within the expected range or performance criteria, even if the circuit is not simply stuck low or high.
Common causes
Most likely first.
- Sensor characteristic drifted
- Sensor mounting displaced
- Sensor element aged beyond calibration window
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 see when the performance fault occurs.
- Compare sensor A's readings with related data and the manufacturer's specification across the operating conditions available to the scan tool.
- Inspect sensor A's mounting and connector for displacement, poor seating, damage, or corrosion that could alter its output.
- Check the sensor A harness for chafing, tension, or poor connections, then test circuit reference, ground, and signal per service information.
- If the circuit checks pass, test the sensor's output and mounting against the manufacturer's procedures to distinguish sensor drift from an inverter-related fault.
Common fixes
- Secure or correctly position a displaced sensor A mounting.
- Repair a loose, damaged, or corroded sensor A connector or wiring.
- Replace drive motor A inverter voltage sensor A if it fails the specified performance test.
- Address an inverter fault only if diagnosis confirms it is affecting sensor A's reading.
Can I keep driving?
The vehicle may limit motor power or enter limp mode, and shutdown is possible. Avoid demanding acceleration and long or high-speed trips; stop safely if power drops sharply or a severe hybrid/EV 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.