OBD Guide
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C149B

Rear Driveline Module

C149B is an OBD-II diagnostic trouble code meaning: Rear Driveline Module. Common causes: damage to module wiring harness, contact corrosion. Estimated repair cost: $167–556.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced rear-wheel drive efficiency
  • Unstable behavior of the car when driving
  • Disabling the all-wheel drive system

Causes

  • Damage to module wiring harness
  • Contact corrosion
  • Rear transmission module malfunction
  • Software problems
  • Mechanical damage to transmission components

How to Fix

  1. Check wiring harness for damage
  2. Clean contacts from corrosion
  3. Scan the module for errors
  4. Update module software
  5. Replace rear transmission module if necessary

Related codes

C149AC149CP0700

FAQ

What does the C149B code mean?

C149B is an OBD-II diagnostic trouble code that indicates: Rear Driveline Module

What causes a C149B error code?

The most common causes of C149B include: Damage to module wiring harness; Contact corrosion; Rear transmission module malfunction; Software problems.

How do I fix a C149B diagnostic trouble code?

To fix C149B: Check wiring harness for damage. Clean contacts from corrosion. Scan the module for errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C149B?

Limited driving only, diagnose soon

How much does it cost to fix C149B?

The estimated repair cost for C149B is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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