C1955 — Steering Angle Sensor Circuit Open #

Note: The description of DTC C1955 may vary depending on the vehicle manufacturer (OEM). Always refer to your vehicle’s service manual for the most accurate information.

• Steering Angle Sensor Circuit Open (Ford)
• Steering Angle Sensor Open Circuit (Toyota)
• Steering Wheel Angle Sensor Circuit Open (BMW)
• Steering Angle Sensor Circuit Malfunction/Open (Nissan)

Summary of DTC C1955 #

DTC C1955 signals an open circuit in the Steering Angle Sensor (SAS) wiring. The SAS is a component that measures the position and rotation of your steering wheel, sending this data to the vehicle’s electronic control systems, especially for stability control and advanced driver assistance features. If the circuit is “open,” it means there’s a break, faulty connection, or damaged wire preventing the sensor from communicating with the vehicle’s computer (ECU). This fault can compromise important safety systems like Electronic Stability Control (ESC) or Electric Power Steering (EPS). In most cases, a warning light will appear on your dashboard, but the vehicle may still be drivable with limited functions.

Common Symptoms for DTC C1955 #

A Steering Angle Sensor Circuit Open fault often manifests through noticeable changes in your vehicle’s electronic systems and handling. Some symptoms are subtle, while others are more obvious and can impact driving safety or comfort. Watch for the following warning signs:

• Steering wheel warning light illuminated on the dashboard
• Electronic Stability Control (ESC) or Traction Control System (TCS) warning lights illuminated
• Loss or reduction of stability control and traction assist features
• Electric Power Steering (EPS) warning light (in vehicles equipped with EPS)
• Unusual or heavy steering feel
• Steering assist may be reduced or temporarily disabled
• ABS (Anti-lock Braking System) light may also illuminate

Probable Causes for DTC C1955 #

There are several potential reasons this code may appear. Causes range from physical wiring issues to problems with the sensor or its connectors. Here they are, ranked by likelihood:

1. Open or broken wiring in the steering angle sensor circuit
2. Loose, dirty, or corroded connectors at the SAS or ECU
3. Defective Steering Angle Sensor
4. Faulty clockspring (the rotating electrical connector behind the steering wheel)
5. Faulty ECU input (rare)

Step-by-Step Diagnosis for C1955 #

Diagnosing C1955 requires a patient, systematic approach. Always start with the most accessible and likely causes before advancing to component replacement. Here’s a recommended workflow:

1. Use an advanced scan tool to confirm C1955 and check for related codes (especially in ABS, ESC, or steering modules).
2. Visually inspect the steering angle sensor wiring harness for obvious damage, breaks, or pinches—especially near the steering column.
3. Check the connectors for the SAS and ECU: look for corrosion, loose pins, bent terminals, or moisture intrusion.
4. Test continuity of the SAS wiring harness with a multimeter to detect open circuits.
5. If wiring and connectors are intact, use OEM diagnostic procedures to test the steering angle sensor performance and output signals.
6. Inspect the clockspring for continuity and proper function (especially if other steering wheel functions are also affected).
7. Clear the code, perform a test drive, and monitor if the code returns after any repairs.

Possible Repairs for C1955 #

The right fix depends on the root cause. Once you’ve pinpointed the issue, use quality parts and follow OEM repair procedures for best results. Potential repairs include:

• Repairing or replacing damaged or broken wiring in the SAS circuit
• Cleaning, tightening, or replacing corroded or loose connectors at the SAS or ECU
• Replacing a faulty Steering Angle Sensor
• Replacing a defective clockspring if continuity fails
• Reprogramming or replacing the ECU, only if all other causes are eliminated

Is It Safe to Drive with C1955? #

Limited – Caution Advised: You can usually drive with this code, but with significant limitations. Most vehicles will disable stability control, traction control, and sometimes power steering assist when this code is active. This means you may lose critical safety features, especially in slippery or emergency conditions. If you notice heavy steering, warning lights, or any change in handling, drive cautiously and have the issue diagnosed and repaired as soon as possible.

Vehicles Most Commonly Affected by C1955 #

While this code can appear on many makes and models, certain vehicles are more frequently affected—especially those with advanced stability or steering systems from the mid-2000s onward. Commonly reported vehicles include:

• Ford (Focus, Fusion, Explorer, Escape)
• Toyota (Camry, Corolla, RAV4, Highlander)
• BMW (3 Series, 5 Series, X3, X5)
• Nissan (Altima, Sentra, Rogue)
• Hyundai and Kia models with Electronic Stability Control

Common Mistakes & Best Practices for C1955 #

Some repair attempts can lead to unnecessary expenses or even new problems. Avoid these pitfalls and follow best practices for a lasting repair:

• Replacing the Steering Angle Sensor without first checking wiring and connectors
• Overlooking the clockspring as a possible failure point
• Neglecting to perform a steering angle sensor calibration after repairs (required on many vehicles)
• Failing to use a scan tool capable of reading ABS/ESC codes, not just standard OBD-II
• Not clearing codes and performing a road test to confirm the repair

Express FAQ for C1955 #

Get quick answers to the most common questions about this fault:

• Q: Can I just clear the code and keep driving?
  A: Clearing the code without addressing the cause won’t solve the problem. The code and symptoms will return until the circuit fault is repaired.
• Q: Do I need special tools to fix this?
  A: For diagnosis, a scan tool that can access ABS/ESC and steering modules is highly recommended. Basic electrical tools (multimeter, wiring diagrams) are also needed. Sensor calibration often requires dealer-level or OEM scan tools.