What it means
The drive motor B position sensor circuit A has a fault. The code does not identify the specific failed component.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Drive Motor B has a position sensor that provides rotor-position feedback to the hybrid or EV control module. The module monitors circuit A for a usable signal and sets this code when it detects a fault in that circuit, without identifying whether the sensor or its wiring is responsible.
Common causes
Most likely first.
- Position sensor failed
- Wiring fault
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Use a scan tool to record freeze-frame data and check related hybrid or EV codes, since other position-sensor faults can help locate the problem.
- With the vehicle powered down according to the manufacturer's safety procedure, inspect Drive Motor B's sensor connector and wiring for damage, loose connections, moisture, or corrosion.
- Check the sensor circuit's power, ground, and signal wiring against the vehicle wiring diagram and manufacturer's specification.
- Test circuit A for continuity, shorts, and poor connections between the Drive Motor B sensor and its control module.
- If the wiring checks out, test Drive Motor B's position sensor using the manufacturer's procedure before deciding whether it needs replacement.
Common fixes
- Reconnect or secure a loose Drive Motor B sensor connector.
- Repair damaged wiring or terminals in Drive Motor B's position-sensor circuit A.
- Clean or replace corroded connector terminals and restore a sound connection.
- Replace Drive Motor B's position sensor if testing confirms it has failed.
Can I keep driving?
Avoid driving if motor power is reduced, the vehicle enters limp mode, or it may shut down; arrange a safe stop and recovery if needed. A faulty position signal can impair motor control and make the vehicle's response unpredictable.
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.