What it means
The current sensor for drive motor A phase V reports a circuit high fault. Phase current measurement is unreliable.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Drive motor A is controlled through an inverter that switches current through its U, V, and W phases. The control module monitors the phase V current sensor’s signal; this code sets when that signal is abnormally high, so the module cannot reliably measure phase V current.
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 check live data for drive motor A phase V current sensor readings and related inverter codes to see when the high signal occurs.
- With the high-voltage system made safe according to the manufacturer's procedure, inspect the phase V sensor connector and harness for corrosion, damage, loose pins, or a signal wire touching B+.
- Check the sensor signal, supply, and ground circuits for continuity, shorts to B+, and poor connections using the manufacturer's wiring information.
- Compare the phase V sensor output with the other drive motor A phase readings under the same conditions to help distinguish a sensor fault from a wiring fault.
- If the wiring and connections pass, test or replace the drive motor A phase V current sensor as directed by the manufacturer's diagnostic procedure.
Common fixes
- Clean and secure corroded or loose phase V sensor connector terminals.
- Repair a phase V signal wire shorted to B+ or damaged harness section.
- Restore a poor sensor ground or supply connection.
- Replace the drive motor A phase V current sensor if its output remains high with sound wiring.
Can I keep driving?
Avoid driving if power is reduced, the vehicle enters limp mode, or the hybrid/EV warning indicates a shutdown risk; the vehicle may lose drive or stop unexpectedly. Have the high-voltage system diagnosed before relying on it.
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.