C1138 Infiniti 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 Infiniti 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.
Code C1138 Infiniti Description
What are the Possible Causes of the DTC C1138 Infiniti?
- Faulty Anti-Lock Brake System (ABS) Actuator and Control Unit
- 4WAS System
How to Fix the DTC C1138 Infiniti?
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 Infiniti 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.
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Frequently Asked Questions about C1138 Infiniti Code
1. What does the OBDII code C1138 mean for an Infiniti?
C1138 indicates an issue with the 4-Wheel Active Steer (4WAS) circuit, which is responsible for controlling the rear-wheel steering system for improved handling and stability.
2. What are the common symptoms of a C1138 code?
Common symptoms include a 4WAS warning light on the dashboard, reduced steering responsiveness, and potential difficulty in handling the vehicle, especially during cornering.
3. What causes the C1138 code to appear?
This code can be triggered by issues such as a faulty 4WAS control module, damaged wiring or connectors, or a malfunctioning rear steering actuator.
4. Can a C1138 code affect drivability?
Yes, it may affect drivability by reducing the responsiveness of the vehicle's steering, especially during high-speed maneuvers or tight turns.
5. How can I diagnose a C1138 code?
Diagnosis involves scanning for stored codes, inspecting the 4WAS wiring and connectors for damage, and testing the rear steering actuator and control module for proper operation.
6. Is it safe to drive with a C1138 code?
While the vehicle may still be drivable, it is not recommended to ignore the code as it can impact vehicle handling and safety.
7. How do I fix a C1138 code on my Infiniti?
Repairs may involve replacing a faulty 4WAS control module, repairing or replacing damaged wiring, or servicing the rear steering actuator.
8. Can a software update resolve a C1138 code?
In some cases, a software update for the 4WAS system from the dealership may resolve the issue if it is caused by a programming error.
9. What tools are needed to troubleshoot a C1138 code?
A professional OBDII scan tool, a multimeter for electrical testing, and Infiniti service manuals for reference are typically needed.
10. How much does it cost to fix a C1138 code?
Repair costs vary depending on the root cause but can range from $200 for wiring repairs to over $1,000 if the 4WAS control module or actuator needs replacement.
Discuss the causes and fixes for C1138 Infiniti OBDII Code
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Done replace engine so I open steering wiring and put it back but now 4WAS circut fault appear in ABS module
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Let me check if I can find more information. What model and year is your vehicle? Why did you open the steering wiring?
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