What it means
The ECM detects a range/performance fault on the drive motor b 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 inverter voltage sensor B reports voltage associated with the B motor drive inverter so the control module can assess its operation. This code sets when that sensor's reading changes erratically or falls outside the expected range or performance pattern, making it unreliable for motor control.
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
- Save freeze-frame data and compare Drive Motor B inverter voltage sensor B live data with related inverter readings to see when the signal becomes implausible.
- Inspect the sensor B mounting and connector for displacement, looseness, damage, or contamination that could disturb the reading.
- Check the sensor B wiring and connector while monitoring live data for changes that point to an intermittent connection.
- Compare the sensor B output with the manufacturer's specification under the conditions shown in the freeze frame.
- If the wiring and mounting are sound, test the sensor for drift or instability and replace it if it fails the specified checks.
Common fixes
- Reseat and secure the Drive Motor B inverter voltage sensor B connector.
- Repair damaged wiring or connector terminals in the sensor B circuit.
- Correct a displaced sensor B mounting.
- Replace sensor B if its output drifts or remains erratic despite sound wiring and mounting.
Can I keep driving?
Avoid relying on full motor power; reduced torque or limp mode may make merging or passing unsafe. If the vehicle limits power or warns of shutdown, stop somewhere safe and arrange assistance.
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.