What Does U025B Mean?
Communication has been lost with special purpose vehicle control module C, a third specialized module for application-specific vehicle equipment. The module is not transmitting or receiving data on the vehicle network.
Common Causes
35%
Special purpose control module C failure or fault
25%
Damaged wiring harness or poor connections to module C
25%
Loss of power or ground to special purpose module C
10%
CAN bus network malfunction or wiring fault
5%
Module programming error or configuration mismatch
Diagnostic Steps
1
Step 1: Identify special purpose module C location and function from vehicle-specific service information
2
Step 2: Test power and ground supply to module C using a multimeter
3
Step 3: Thoroughly inspect connectors and wiring for damage, corrosion, or water intrusion at module location
4
Step 4: Measure CAN bus voltages at module connector (should see approximately 2.5V on both CAN High and Low lines)
5
Step 5: Check module programming/configuration settings and reprogram if needed, or replace module if hardware fault is confirmed
Estimated Repair Cost
$250 - $2,000
Parts + labor, varies by vehicle and location
Communication has been lost with special purpose vehicle control module C, a third specialized module for application-specific vehicle equipment. The module is not transmitting or receiving data on the vehicle network.
The most common cause of U025B (Lost Communication With Special Purpose Vehicle Control Module "C") is: Special purpose control module C failure or fault
Typical repair costs for U025B range from $250 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safety impact is application-dependent. If module C controls critical auxiliary equipment such as hydraulic systems, PTO equipment, or emergency functions, loss of communication may create operational hazards or prevent safe equipment operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U025B to identify the root cause.
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Quick Info
Category
Network
System
Specialized Equipment/Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
