What Does U025A Mean?
The control module has lost communication with special purpose vehicle control module B. This is a secondary specialized module for application-specific equipment on commercial, emergency, or utility vehicles.
Common Causes
35%
Special purpose control module B internal failure
25%
Wiring harness damage or connector issues to module B
25%
Power or ground circuit fault to special module B
10%
CAN bus communication circuit fault or network issue
5%
Module not properly programmed or configured
Diagnostic Steps
1
Step 1: Determine the identity and location of special purpose module B from service documentation for your specific vehicle
2
Step 2: Verify power and ground circuits at module B connector using multimeter with key on
3
Step 3: Inspect wiring harness routing and connectors, especially if equipment is exposed to weather or vibration
4
Step 4: Check CAN bus communication signals at the module (both lines should be approximately 2.5V)
5
Step 5: Verify module configuration matches vehicle setup, attempt reprogramming or replace module if circuits are intact
Estimated Repair Cost
$250 - $2,000
Parts + labor, varies by vehicle and location
The control module has lost communication with special purpose vehicle control module B. This is a secondary specialized module for application-specific equipment on commercial, emergency, or utility vehicles.
The most common cause of U025A (Lost Communication With Special Purpose Vehicle Control Module "B") is: Special purpose control module B internal failure
Typical repair costs for U025A range from $250 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safety implications vary based on specific equipment controlled. Loss of communication with specialized safety or emergency equipment may render the vehicle non-compliant for its intended special purpose operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U025A 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
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.
