What it means
The position sensor channel B of drive motor A reports a circuit high fault. Phase commutation feedback impaired on this channel.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Drive Motor A's position sensor channel B reports rotor position to the module that controls motor commutation. P0C5D sets when channel B stays higher than the expected signal range, such as from a short to battery voltage, an open sensor, or a poor connector contact.
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
- Review freeze-frame data and related hybrid or EV codes to see when the Drive Motor A channel B high signal was detected.
- Check live channel B data and compare it with other available Drive Motor A position data to verify the high condition.
- With the vehicle powered down according to the manufacturer's safety procedure, inspect channel B wiring and the sensor connector for damage, loose pins, corrosion, or contact with a power wire.
- Test the channel B signal circuit for an open or short to battery voltage using the manufacturer's procedure.
- If wiring and connector tests pass, test the Drive Motor A sensor channel B circuit against the manufacturer's specification.
Common fixes
- Repair channel B wiring shorted to a power supply.
- Repair an open or damaged section of the channel B signal circuit.
- Clean or repair corroded, loose, or damaged sensor connector terminals.
- Replace the Drive Motor A position sensor if it is open or fails the specified test.
Can I keep driving?
The high signal can disrupt motor commutation and result in reduced torque, limp mode, or shutdown. Avoid trips where a sudden loss of propulsion would be dangerous, and stop safely if the vehicle's power becomes unreliable.
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.