P0E94: Drive Motor B Inverter Voltage Sensor B Circuit High

What it means

The ECM detects a circuit 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's inverter voltage sensor B monitors a voltage within that motor's inverter for the control module. This code sets when the sensor B circuit has an electrical fault, making the voltage reading unreliable for motor control.

Common causes

Most likely first.

1. Sensor failed
2. Wiring or connector fault

Symptoms

• EV/hybrid system warning light on
• Reduced motor power or torque
• Possible limp mode or vehicle shutdown

How to diagnose it

1. Use a scan tool to capture freeze-frame data and related codes, confirming that the reported fault is on drive motor B inverter voltage sensor B.
2. With the high-voltage system made safe, visually inspect drive motor B inverter sensor B's connector and wiring for looseness, corrosion, damage, or pinched insulation.
3. Check the sensor B circuit for opens or shorts using the wiring diagram and compare results with the manufacturer's specification.
4. Verify the sensor's connector contact and specified supply and ground connections to rule out a poor connection.
5. If the circuit checks out, test sensor B and the inverter or control module for an internal electrical fault.

Common fixes

• Reseat or clean the drive motor B sensor B connector.
• Repair damaged, open, or shorted sensor B wiring.
• Replace drive motor B inverter voltage sensor B if its circuit tests pass but the sensor fails.
• Repair the inverter or control module if testing confirms an internal fault.

Can I keep driving?

Reduced torque, limp operation, or shutdown may occur, and the vehicle may not enter READY. Avoid driving if power is limited or unpredictable; high-voltage inverter diagnosis must follow the manufacturer's safety procedures.