What it means
The ECM detects a high fault on the drive motor a inverter voltage sensor b 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 B's inverter voltage sensor B supplies a voltage reading used to control that motor's inverter. This code sets when the circuit's signal is outside its expected range or does not respond plausibly; the supplied meaning describes a high fault on the corresponding motor A circuit, so confirm the affected circuit and condition with vehicle-specific diagnostic data.
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
- Read freeze-frame data and live inverter sensor readings, confirming the code and whether the high signal is attributed to drive motor B sensor B or another circuit.
- With the high-voltage system made safe, inspect drive motor B inverter sensor B wiring and connector for a short to power, an open, corrosion, or loose contact.
- Check the signal circuit for a short to power or an open using the wiring diagram and manufacturer's specification.
- Verify sensor B's connector contact, reference, and ground where specified, then check whether the signal tracks inverter conditions during the approved test.
- If wiring and connections pass, test drive motor B sensor B and the inverter for an internal fault before replacing parts.
Common fixes
- Repair a sensor B signal wire shorted to power or an open circuit.
- Clean or repair corroded or loose connector contacts at drive motor B's inverter.
- Replace drive motor B inverter voltage sensor B if its signal remains implausible with a sound circuit.
- Repair the inverter if its specified checks identify an internal fault.
Can I keep driving?
Reduced torque, limp operation, or a failure to enter READY may make the vehicle unsafe or unusable. Avoid driving if power is restricted or unpredictable, and keep clear of inverter wiring unless the high-voltage system has been made safe.
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.