What it means
The voltage sensor B signal for drive motor A's inverter is outside the expected range or does not respond plausibly. The module sets this code when the signal fails its range or performance checks.
How it works
Drive motor A's inverter voltage sensor B monitors inverter voltage so the control module can manage motor power. This code sets when the signal is electrically present but falls outside its expected range or fails to respond plausibly as operating conditions change.
Common causes
Most likely first.
- Faulty voltage sensor
- Loose or corroded connector
- Wiring resistance or intermittent fault
- Inverter fault
Symptoms
- Hybrid or EV warning light
- Reduced power
- Vehicle may not enter READY mode
- Reduced or unavailable regenerative braking
How to diagnose it
- Record freeze-frame data and scan live inverter voltage sensor B readings alongside other available inverter data to identify when the signal stops tracking plausibly.
- With the high-voltage system made safe, inspect sensor B's connector and drive motor A inverter wiring for corrosion, looseness, damage, or signs of an intermittent high-resistance connection.
- Check the sensor B wiring for excessive resistance or intermittent continuity, comparing results with the manufacturer's specification.
- Monitor sensor B's signal during the manufacturer-specified operating test to see whether it changes as expected or becomes erratic.
- If wiring and connections pass, test the sensor and inverter for a signal fault before replacing either component.
Common fixes
- Reseat or clean a loose or corroded sensor B connector.
- Repair wiring with excessive resistance or an intermittent connection.
- Replace drive motor A inverter voltage sensor B if its signal fails the specified response test.
- Repair the inverter if its output causes the sensor signal to fall outside the expected range.
Can I keep driving?
Reduced power, lost regenerative braking, or a failure to enter READY may occur, and the vehicle may not respond normally. Avoid driving if power is limited or READY is unavailable; high-voltage inverter diagnosis requires the manufacturer's safety procedures.
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.