What Does U0135 Mean?
The control module network has lost communication with the Front Differential Control Module. This module manages front differential locking, torque distribution, or active differential functions in all-wheel or four-wheel drive vehicles.
Common Causes
35%
Front Differential Control Module internal failure or software corruption
30%
Damaged wiring harness or connector terminals due to environmental exposure
20%
CAN network circuit fault or improper termination
10%
Power supply circuit fault or voltage drop to module
5%
Ground circuit open or corrosion at ground point
Diagnostic Steps
1
Step 1: Verify battery voltage and power supply to Front Differential Control Module
2
Step 2: Inspect module location for physical damage, water intrusion, or environmental contamination
3
Step 3: Check module connector pins for corrosion, fretting, or spread terminals
4
Step 4: Measure CAN bus signal integrity using oscilloscope or multimeter for voltage levels
5
Step 5: Test ground circuit resistance (should be less than 0.5 ohms to chassis ground)
Estimated Repair Cost
$200 - $1,600
Parts + labor, varies by vehicle and location
The control module network has lost communication with the Front Differential Control Module. This module manages front differential locking, torque distribution, or active differential functions in all-wheel or four-wheel drive vehicles.
The most common cause of U0135 (Lost Communication With Differential Control Module Front) is: Front Differential Control Module internal failure or software corruption
Typical repair costs for U0135 range from $200 to $1,600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Front differential may default to open or locked mode, affecting traction and handling. Four-wheel drive functionality may be compromised, particularly in low-traction conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0135 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Network
System
Front Differential/AWD System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
