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Engine-Codes – Generic – C1138

C1138 Code - 4-Wheel Active Steer Circuit

Quick Answer

The C1138 diagnostic trouble code (DTC) refers to a 4-wheel active steer circuit malfunction in the vehicle. Common causes include Faulty steering angle sensor or yaw rate sensor, Wiring harness issues, such as damaged or corroded wires, Malfunctioning steering control module or electronic control unit (ECU). 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
C1138 indicates 4-Wheel Active Steer Circuit.
Common causes
Common causes include Faulty steering angle sensor or yaw rate sensor, Wiring harness issues, such as damaged or corroded wires, Malfunctioning steering control module or electronic control unit (ECU).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code C1138 Description

The C1138 diagnostic trouble code (DTC) refers to a 4-wheel active steer circuit malfunction in the vehicle. This code is typically found in vehicles equipped with advanced steering systems that actively adjust the steering angle of all four wheels to enhance handling, stability, and overall driving performance. The active steer system works in conjunction with the vehicle's electronic control units (ECUs) and sensors to continuously monitor various parameters such as vehicle speed, steering input, and road conditions.

OBDII Code C1138 - 4-Wheel Active Steer Circuit
C1138 Code - 4-Wheel Active Steer Circuit

Common Causes of C1138

  1. Faulty steering angle sensor or yaw rate sensor.
  2. Wiring harness issues, such as damaged or corroded wires.
  3. Malfunctioning steering control module or electronic control unit (ECU).
  4. Failed 4-wheel active steer actuator or motor.
  5. Poor electrical connections or loose connectors in the steering system.

Symptoms of C1138

  1. Unusual steering behavior, such as delayed response or erratic steering input.
  2. Uneven tire wear or abnormal tire wear patterns.
  3. Illumination of the ABS or traction control warning lights on the dashboard.
  4. Increased steering effort required to turn the wheels.
  5. Loss of stability or control during cornering or lane changes.

How to Fix C1138

  1. Begin by performing a comprehensive diagnostic scan to retrieve the specific trouble codes and pinpoint the exact cause of the 4-wheel active steer circuit malfunction.
  2. Inspect the steering angle sensor, yaw rate sensor, and other relevant sensors for any signs of damage or irregularities.
  3. Check the wiring harness for any visible damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
  4. Test the 4-wheel active steer actuator or motor to ensure proper functionality. Replace the component if it is found to be faulty.
  5. Clear the DTCs from the vehicle's ECU memory and conduct a road test to verify that the 4-wheel active steer circuit is operating correctly.

Cost to Fix C1138

The typical repair costs for addressing a 4-wheel active steer circuit malfunction can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the repair costs for this type of problem can range from $500 to $1500, including parts and labor. It is important to note that the diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle complexity, and technician expertise. For a more accurate estimate, it is recommended to consult with local auto repair shops or dealerships.

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Code C1138 Information for Specific Makes

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 C1138 Code

1. What are common symptoms of OBDII code C1138 (4-Wheel Active Steer Circuit)?

- Common symptoms include the malfunction indicator light (MIL) coming on, erratic steering behavior, and issues with the vehicle's stability control system.

2. What are possible causes of OBDII code C1138?

- Possible causes include a faulty 4-wheel active steer module, damaged wiring or connectors in the circuit, or a malfunction in the steering angle sensor.

3. How can I diagnose the cause of OBDII code C1138?

- Diagnosis typically involves using a scan tool to retrieve the trouble codes, inspecting the 4-wheel active steer system components, and testing the wiring and connectors for continuity and proper voltage.

4. Can I still drive my vehicle with OBDII code C1138 present?

- It is not recommended to drive the vehicle with this code present, as it can impact the steering and stability control systems, potentially leading to unsafe driving conditions.

5. How can I repair OBDII code C1138?

- Repairing this code may involve replacing the faulty 4-wheel active steer module, repairing or replacing damaged wiring or connectors, or recalibrating the steering angle sensor as needed.

6. Are there any DIY tips for addressing OBDII code C1138?

- DIY tips may include checking for loose or damaged connectors, ensuring proper electrical connections, and consulting the vehicle's service manual for specific troubleshooting steps.

7. Is it safe to reset the OBDII code C1138 on my own?

- While you can clear the code using a scan tool, it is important to address the underlying issue causing the code to prevent safety risks and ensure proper vehicle operation.

8. How much does it typically cost to repair OBDII code C1138?

- The cost of repairing this code can vary depending on the specific cause, parts needed, and labor rates, so it's recommended to consult a professional for an accurate estimate.

9. Can OBDII code C1138 be intermittent?

- Yes, this code can sometimes be intermittent, but it is still important to address the underlying issue to prevent potential safety hazards and ensure the proper functioning of the vehicle's steering system.

10. Is it necessary to take my vehicle to a dealership for OBDII code C1138 repair?

- While a dealership may have specialized knowledge and tools for this repair, independent automotive repair shops with experience in steering systems may also be able to effectively diagnose and repair OBDII code C1138.

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