AutoCodes – Generic – C15C4

C15C4 Code - Steering Angle Signal

Quick Answer

Signal transmission between the Steering Control ECU and steering angle sensor is performed via serial communication. Common causes include Faulty Steering Angle Sensor, Steering Angle Sensor harness is open or shorted, Steering Angle Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C15C4 indicates Steering Angle Signal.
Common causes: Common causes include Faulty Steering Angle Sensor, Steering Angle Sensor harness is open or shorted, Steering Angle Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,198

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C15C4 Description

Signal transmission between the Steering Control ECU and steering angle sensor is performed via serial communication. If an error occurs between them in serial communication, the ECU will store the Diagnostic Trouble Code (DTC) C15C4.

OBDII Code C15C4 - Steering Angle Signal - AutoCodes.com — C15C4 Code - Steering Angle Signal

What does this mean?

What are the Possible Causes of the DTC C15C4?

Faulty Steering Angle Sensor
Steering Angle Sensor harness is open or shorted
Steering Angle Sensor circuit poor electrical connection
Faulty Steering Control ECU

How to Fix the DTC C15C4?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C15C4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C15C4 code?

Need more information on how to fix the C15C4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C15C4 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C15C4 Lexus — Steering Angle Signal
C15C4 Scion — Steering Angle Signal
C15C4 Toyota — Steering Angle Signal

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C15C4 Code

What does the OBDII code C15C4 mean?

C15C4 indicates a problem with the Steering Angle Signal, which is essential for various vehicle dynamics systems, including stability control and traction control.

What are the common symptoms associated with the C15C4 code?

Symptoms may include the illumination of the check engine light, issues with traction control or stability control systems, and abnormal steering behavior.

What can cause the C15C4 code to trigger?

Common causes include a faulty steering angle sensor, issues with the wiring or connectors associated with the sensor, or problems in the vehicle's electronic control unit (ECU).

How can I diagnose the C15C4 code?

Start by using an OBDII scanner to confirm the code, then check the steering angle sensor for proper operation and inspect the wiring and connectors for damage or corrosion.

What are some repair tips for fixing the C15C4 code?

Repair tips include recalibrating the steering angle sensor, replacing a faulty sensor, or repairing damaged wiring and connectors related to the sensor.

Can I drive my vehicle with the C15C4 code?

While you can technically drive with the C15C4 code, it is not recommended, as it may affect vehicle handling and safety systems, potentially leading to hazardous driving conditions.

Is it necessary to reset the vehicle's computer after fixing the C15C4 code?

Yes, after making repairs, it is advisable to clear the code using an OBDII scanner and test drive the vehicle to ensure the issue is resolved and the code does not reappear.

How much does it typically cost to repair the C15C4 code?

Repair costs can vary widely depending on the cause, but expect to pay anywhere from $100 to $500 for sensor replacement or wiring repairs.

Can I fix the C15C4 code myself?

If you have experience with automotive repairs and access to diagnostic tools, you may be able to address simple issues like recalibrating or replacing the sensor; otherwise, professional help is recommended.