OBD Guide
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C1138

4-Wheel Active Steer Circuit

C1138 is an OBD-II diagnostic trouble code meaning: 4-Wheel Active Steer Circuit. Common causes: open or short circuit in wiring harness, malfunction of wheel angle sensors. Estimated repair cost: $111–556.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$111–556 (est.)

Symptoms

  • Deterioration in handling
  • Check engine light comes on
  • Disabling Active Steering

Causes

  • Open or short circuit in wiring harness
  • Malfunction of wheel angle sensors
  • Problems with the active steering control unit
  • Contact corrosion

How to Fix

  1. Check wiring harness for damage
  2. Check wheel angle sensors
  3. Check active steering control unit
  4. Clean contacts from corrosion
  5. Replace faulty components

Related codes

C1137C1139C1140

FAQ

What does the C1138 code mean?

C1138 is an OBD-II diagnostic trouble code that indicates: 4-Wheel Active Steer Circuit

What causes a C1138 error code?

The most common causes of C1138 include: Open or short circuit in wiring harness; Malfunction of wheel angle sensors; Problems with the active steering control unit; Contact corrosion.

How do I fix a C1138 diagnostic trouble code?

To fix C1138: Check wiring harness for damage. Check wheel angle sensors. Check active steering control unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1138?

Limited driving only, diagnose soon

How much does it cost to fix C1138?

The estimated repair cost for C1138 is $111–556. Actual cost depends on your vehicle, location, and labor rates.

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