What it means
This code identifies a fault associated with signal C from the steering wheel position sensor. The specific failure depends on the diagnostic subtype.
How it works
The steering wheel position sensor provides steering information to the stability-control module through multiple signal channels. C0054 singles out a fault associated with signal C; inspect that signal path and the diagnostic subtype rather than assuming the sensor itself has failed.
Common causes
Most likely first.
- Faulty steering wheel position sensor
- Damaged or loose sensor connector
- Open or shorted signal wiring
- Sensor misalignment or lost calibration
Symptoms
- ABS or stability control warning light
- Traction control warning light
- Stability control may be limited or disabled
- Incorrect steering angle readings
How to diagnose it
- Read the module's freeze-frame and subtype details, then monitor live steering-position data while turning the wheel slowly to look for missing or implausible signal C information.
- Inspect the sensor connector for looseness, corrosion, bent pins, or damage affecting the signal C terminal.
- Check signal C wiring along its route for chafing, an open circuit, or a short to another wire or ground.
- Test the signal C circuit and relevant supply and ground using the manufacturer's procedure and specification.
- If electrical checks pass, verify sensor alignment and calibration as directed by the service information.
Common fixes
- Reseat and secure the steering position sensor connector.
- Repair an open, shorted, or chafed signal C wire.
- Correct sensor alignment or perform the required calibration.
- Replace the steering position sensor if signal C fails the specified tests.
Can I keep driving?
The car may remain driveable, but stability and traction control can be limited or disabled. Keep speeds and steering inputs moderate, especially in poor weather, since the system may not respond as intended.
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.