What it means
This code identifies a fault associated with signal D from the steering wheel position sensor. The specific failure depends on the diagnostic subtype.
How it works
The steering wheel position sensor sends steering information to the stability-control module over multiple signal channels. C0055 identifies a fault associated with signal D specifically, so diagnosis should establish whether that channel's wiring, connection, or sensor output is at fault.
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 information, then monitor live steering-position data while turning the wheel slowly for missing or implausible signal D information.
- Inspect the sensor connector for looseness, corrosion, bent pins, or damage at the signal D terminal.
- Trace signal D wiring for chafing, an open circuit, or a short, including sections that move with the steering column.
- Test signal D and its related circuit checks according to the manufacturer's procedure and specification.
- If the circuit checks pass, verify sensor alignment and calibration using the specified scan-tool procedure.
Common fixes
- Reseat and secure the steering position sensor connector.
- Repair an open, shorted, or chafed signal D wire.
- Correct sensor alignment or perform the required calibration.
- Replace the steering position sensor if signal D remains faulty after circuit checks.
Can I keep driving?
Ordinary steering and braking may remain available, but stability and traction control can be reduced or disabled. Drive cautiously and avoid conditions that depend on those systems to help control a skid.
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.