What it means
The position sensor channel C of drive motor A reports a range/performance fault. The drive motor's position, current and temperature are watched continuously; a fault here downgrades the inverter to a safe operating point or triggers torque reduction.
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 C helps the inverter track motor position for accurate torque control. This code sets when the channel C signal is present but falls outside the expected range or does not agree with expected motor behavior, which can result from sensor offset, electrical noise, or sensor ageing.
Common causes
Most likely first.
- Sensor mechanically offset
- Electrical noise on signal line
- 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
- Record freeze-frame data and check for related motor position, inverter, or electrical-noise codes.
- Inspect the drive motor A channel C connector and accessible wiring for poor contact, damage, or routing that could expose the signal to interference.
- Review channel C live data, if available, for a steady offset, noisy signal, or disagreement with other motor position information.
- Check sensor installation and alignment using the manufacturer's procedure, since a mechanical offset can make an otherwise functioning signal implausible.
- Test the channel C signal and wiring against the manufacturer's specification before considering sensor replacement.
Common fixes
- Correct a loose connection or damaged wiring affecting the channel C signal.
- Repair wiring routing or shielding if the manufacturer's procedure identifies electrical interference.
- Correct sensor installation or alignment if it is outside the manufacturer's requirements.
- Replace the channel C sensor if its output remains outside the specified range with sound wiring and correct installation.
Can I keep driving?
The inverter may limit drive motor A torque or put the vehicle into a protective mode, reducing acceleration or causing a shutdown. Avoid high-load driving and stop safely if power drops sharply or the vehicle displays a shutdown warning.
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.