Lost Communication With Differential Control Module -- Rear
The U0136 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Differential Control Module -- Rear. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $1200 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- AWD or 4WD system warning light on
- Rear differential locking not available
- Limited slip differential not functioning electronically
- Check Engine Light may be on
- Unusual noises from rear differential
Probable Causes (Ranked by Likelihood)
- Failed rear differential control module Very High
- Damaged wiring to rear differential module High
- Rear differential actuator or clutch pack failure Moderate
- Low rear differential fluid Moderate
- Water intrusion at rear differential connector Low
Step-by-Step Diagnostic Procedure
-
Scan for DTCs in the AWD/4WD and differential modules
-
Check rear differential fluid level and condition
-
Inspect wiring and connector at the rear differential module
-
Verify power supply and ground at the module
-
Test the rear differential locking actuator for operation
Frequently Asked Questions
Can I drive with code U0136?
You can drive short distances on paved roads. The rear differential will operate as an open differential without electronic locking or limited-slip functionality.
What causes U0136?
A failed rear differential control module is the most common cause. Wiring damage, low fluid, and actuator failure are also frequent causes. The rear differential module is exposed to road elements, increasing failure risk.
Will I lose traction without the rear diff module?
You will lose the electronic locking or limited-slip feature, which means one wheel can spin freely on slippery surfaces. The standard braking-based traction control may still partially compensate.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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