AutoCodes – Generic – C1138

C1138 Code - 4-Wheel Active Steer Circuit

Quick Answer

The ABS actuator and electric unit (control unit) and the 4-Wheel Active Steer (4WAS) control unit exchange signals via the Controlled Area Network (CAN) communication line. Common causes include Faulty Anti-Lock Brake System (ABS) Actuator and Control Unit, 4WAS System. 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 Anti-Lock Brake System (ABS) Actuator and Control Unit, 4WAS System.
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 18,901

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 Aug 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1138 Description

The ABS actuator and electric unit (control unit) and the 4-Wheel Active Steer (4WAS) control unit exchange signals via the Controlled Area Network (CAN) communication line.

OBDII Code C1138 - 4-Wheel Active Steer Circuit - AutoCodes.com — C1138 Code - 4-Wheel Active Steer Circuit

What does this mean?

What are the Possible Causes of the DTC C1138?

Faulty Anti-Lock Brake System (ABS) Actuator and Control Unit
4WAS System

How to Fix the DTC C1138?

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 C1138 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 C1138 code?

Need more information on how to fix the C1138 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1138 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1138 Infiniti — 4-Wheel Active Steer Circuit
C1138 Nissan — 4-Wheel Active Steer Circuit

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.