C0055 medium Severity

C0055: Steering Wheel Position Sensor Signal D Circuit Fault

May degrade steering‐related safety systems such as stability control and traction assist; vehicle remains drivable with caution

Overview

DTC C0055 indicates a fault in the steering wheel position/steering angle sensor specifically related to its "Signal D" output circuit, commonly affecting stability control, ABS, and steering assist systems.

Common Symptoms

  • ABS or stability control warning light illuminated
  • Steering assist reduction or erratic steering behavior
  • Traction control or electronic stability systems deactivated
  • Inconsistent steering angle data on scan tool

Most Common Causes

Faulty steering wheel position sensor or steering angle sensor high

Sensor internal failure often results in incorrect or missing Signal D output

Damaged or corroded wiring/connectors in sensor circuit high

Wiring flex in the steering column leads to breaks or intermittent connections

Steering column clock spring wear or failure medium

Clock spring issues can interrupt sensor signal paths

Control module fault (SRS/ESC/PCM interpretation issue) low

Rare; usually diagnosed after other causes are eliminated

Diagnostic Steps

  1. Use a professional-grade scan tool to read C0055 and any related codes, and view live steering angle sensor data
    Expected: Signal D values should change plausibly as the steering wheel is turned
    Interpretation: Erratic or flat readings imply sensor or wiring issues
  2. Visually inspect wiring harness and connectors at the steering wheel position/angle sensor
    Expected: No broken wires, no corrosion, firm connector seating
    Interpretation: Damage suggests wiring repair is needed
  3. Check continuity of Signal D circuit with a multimeter or oscilloscope from sensor to control module
    Expected: Circuit shows proper continuity and expected voltage range
    Interpretation: Open circuit or shorts confirm electrical faults
  4. Perform sensor calibration or driving test with live data
    Expected: Steering angle values track wheel movement
    Interpretation: Inconsistent tracking indicates sensor or clock spring fault
  5. Consider control module re-programming or replacement if all others pass
    Expected: Control module communicates correctly and clears code
    Interpretation: Persistent fault suggests module issue

Repair Solutions

Replace faulty steering wheel position/steering angle sensor medium
Estimated Cost: $150 - $450

Requires calibration after installation on most vehicles

Repair or replace damaged wiring and connectors medium
Estimated Cost: $50 - $200

Typical if harness flex has caused intermittent signal loss

Replace steering column clock spring if faulty hard
Estimated Cost: $200 - $600

Part of airbag/steering assembly and often requires professional service

Reprogram or replace control module (rare) hard
Estimated Cost: $400 - $1500

Used when module fails to interpret sensor data correctly

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Interpreting C0055 as a rear wheel speed sensor ABS code without considering steering angle sensor context

Frequently Asked Questions

What does the C0055 code mean?

Steering Wheel Position Sensor Signal D Circuit Fault is the standard definition for C0055. This diagnostic code is triggered when the ECU detects a problem in the Sensors.

Reflecting on severity: How bad is C0055?

You should treat C0055 as a medium issue. May degrade steering‐related safety systems such as stability control and traction assist; vehicle remains drivable with caution

What happens when the C0055 code is active?

Drivers often report: ABS or stability control warning light illuminated, Steering assist reduction or erratic steering behavior, Traction control or electronic stability systems deactivated when this code is present.

What causes the C0055 code?

The most common causes are: Faulty steering wheel position sensor or steering angle sensor, Damaged or corroded wiring/connectors in sensor circuit, Steering column clock spring wear or failure.

What is the price difference for fixing C0055?

The cost varies significantly based on the root cause. For example, replacing a Repair or replace damaged wiring and connectors typically costs between $50 and $200, while fixing a Reprogram or replace control module (rare) can range from $400 to $1500.

Is the C0055 code specific to BMW?

Yes, C0055 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

User Comments (0)

Share your experience or ask a question about this code.

Be the first to share your experience with C0055!