What Does U0102 Mean?
The requesting module cannot communicate with the transfer case control module. This affects four-wheel drive system operation and coordination.
Common Causes
35%
Failed transfer case control module or motor encoder
25%
Open circuit or damaged wiring to transfer case module
20%
Blown fuse or loss of power to transfer case control module
15%
Corroded connector at transfer case module due to environmental exposure
5%
CAN bus communication line damage between modules
Diagnostic Steps
1
Step 1: Check fuses for transfer case control module and four-wheel drive system
2
Step 2: Inspect transfer case module connector for corrosion, water intrusion, or damage (module often mounted in exposed location)
3
Step 3: Verify power and ground at transfer case control module using wiring diagram and multimeter
4
Step 4: Check CAN bus communication lines for continuity and proper voltage at transfer case module connector
5
Step 5: Test transfer case module operation by commanding mode changes with scan tool; replace module if communication restored but non-functional
Estimated Repair Cost
$200 - $1,800
Parts + labor, varies by vehicle and location
The requesting module cannot communicate with the transfer case control module. This affects four-wheel drive system operation and coordination.
The most common cause of U0102 (Lost Communication with Transfer Case Control Module) is: Failed transfer case control module or motor encoder
Typical repair costs for U0102 range from $200 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Four-wheel drive system may not engage or disengage properly. May cause drivetrain binding or unexpected engagement creating loss of vehicle control.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0102 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
Four-Wheel Drive System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
