C1955 — Steering Angle Sensor Circuit Open #

Note: The description of DTC C1955 may vary depending on the vehicle manufacturer. Always refer to OEM documentation for your specific application.

• Steering Angle Sensor Circuit Open (Generic/OEM)
• Steering Angle Sensor Signal Circuit Open (Ford)
• Steering Angle Sensor Circuit Malfunction (Mazda)
• Steering Angle Sensor Circuit Open or Intermittent (Toyota)

Summary of DTC C1955 #

The C1955 code indicates that the vehicle’s onboard diagnostics (OBD-II/EOBD) have detected an open circuit in the Steering Angle Sensor (SAS) circuit. The SAS is a sensor that monitors the position and rotation of the steering wheel, providing critical data to systems such as Electronic Stability Control (ESC), Traction Control, and Advanced Driver Assistance Systems (ADAS). An “open circuit” generally means there is a break or disconnection in the wiring, connector, or within the sensor itself, preventing proper communication. This fault can compromise the performance of safety systems that rely on accurate steering angle information. Prompt attention is advised to maintain optimal handling and vehicle safety.

Frequent Symptoms for DTC C1955 #

When a C1955 code is stored, the vehicle may exhibit several noticeable symptoms, often related to the functioning of stability and traction systems. Drivers may not always notice issues immediately, but certain warning signs commonly appear:

• ABS or ESC warning light illuminated on the dashboard
• Traction control system disabled
• Loss of power steering assist (on some models)
• Steering feels heavier or less responsive
• Unusual handling behavior, especially in slippery conditions
• Fault messages such as “Check Stability Control” or “Steering Malfunction”

Most Likely Causes for DTC C1955 #

The causes of a C1955 code typically relate to electrical issues within the steering angle sensor circuit. The following are the most common sources, ranked by frequency:

1. Damaged or disconnected Steering Angle Sensor wiring harness
2. Faulty Steering Angle Sensor
3. Loose, corroded, or damaged sensor connector
4. Open circuit in the wiring between the sensor and the control module
5. Defective clockspring (spiral cable in the steering column)
6. Fault in the ABS/ESC control module

Step-by-Step Diagnosis for C1955 #

Diagnosing a C1955 code requires a systematic approach to accurately identify the root cause of the open circuit. Here’s a straightforward process that both advanced DIYers and technicians can follow:

• 1. Scan for additional DTCs – Use a professional OBD-II scanner to check for related codes that might help pinpoint the fault.
• 2. Inspect the steering angle sensor wiring – Visually examine the harness for cuts, pinches, or abrasions, especially near moving parts.
• 3. Check the sensor connector – Ensure the connector is fully seated, clean, and free of corrosion or bent pins.
• 4. Test for continuity – Using a multimeter, verify the continuity of the wires between the sensor and the control module; repair any open circuits found.
• 5. Inspect the clockspring – If equipped, check the clockspring (spiral cable) within the steering column for continuity and damage.
• 6. Test or replace the steering angle sensor – If wiring and connections are good, the sensor itself may be faulty and require replacement.
• 7. Clear codes and perform a system reset – After repairs, clear the code and test drive to ensure the issue is resolved and no codes return.

Possible Repairs for C1955 #

The solution for a C1955 code depends directly on the identified cause. Here’s a list of repair actions matched to the likely culprits:

• Repair or replace damaged wiring harness associated with the steering angle sensor
• Reconnect or clean the sensor connector to ensure a secure and corrosion-free connection
• Replace the steering angle sensor if it fails continuity or output tests
• Replace the clockspring if internal continuity is lost
• Replace or reprogram the ABS/ESC control module only if confirmed as faulty after all other checks

Is It Safe to Drive with Code C1955? #

Limited — While the vehicle may still be drivable in many cases, the presence of code C1955 means that critical safety systems like Electronic Stability Control and Traction Control may be disabled or impaired. This can increase the risk of losing control in adverse conditions, such as wet or icy roads. It is strongly recommended to address the issue as soon as possible and avoid driving in hazardous conditions until repairs are completed.

Vehicles Most Commonly Affected by C1955 #

C1955 is a generic code but is most frequently reported on certain makes and models, especially those using similar SAS and ESC system architectures:

• Ford (Focus, Escape, Fusion, Explorer)
• Mazda (Mazda3, Mazda6, CX-5)
• Toyota (Camry, Highlander, RAV4)
• Hyundai and Kia models with integrated stability systems
• Some Volkswagen and Audi vehicles (typically as a manufacturer-specific code)

Common Mistakes & Best Practices for C1955 #

Misdiagnosis can lead to unnecessary parts replacement or persistent issues. Avoid these pitfalls and follow expert best practices:

• Don’t replace the steering angle sensor without checking wiring and connectors first
• Never ignore the possibility of a faulty clockspring, especially if steering wheel controls or airbag lights are also affected
• Always use a scan tool capable of reading live data from the SAS to confirm proper operation
• Reset and recalibrate the steering angle sensor after repair; some vehicles require a specific procedure or scan tool function
• Document any prior repairs or collision damage that may have affected the steering column or wiring

Quick FAQ for C1955 #

Still have questions? Here are answers to some of the most common concerns:

• Q: Can I fix C1955 myself?
  A: If you are comfortable with basic electrical diagnosis and have access to a scan tool, you can inspect connectors and wiring. However, sensor replacement and system recalibration may require specialized tools or professional service.
• Q: Will clearing the code fix the problem?
  A: Simply clearing the code will not fix the root cause. The code will return unless the underlying open circuit or sensor fault is properly addressed.