What Does U0259 Mean?
Communication has been lost with special purpose vehicle control module A, which is an application-specific module for specialized vehicle functions such as ambulance, police, utility, or commercial vehicle equipment. The module is not responding on the network.
Common Causes
35%
Special purpose control module A failure or internal fault
25%
Damaged wiring or corroded connectors to special module
25%
Power supply fault or blown fuse to special purpose module
10%
CAN bus network fault or improper termination
5%
Module configuration error or software issue
Diagnostic Steps
1
Step 1: Identify the specific special purpose module A for your vehicle application (consult service information)
2
Step 2: Check power and ground supply to the identified module using a multimeter
3
Step 3: Inspect wiring and connectors for physical damage, particularly in areas exposed to harsh conditions
4
Step 4: Verify CAN bus signals are present at the module connector (should see approximately 2.5V on CAN High and Low)
5
Step 5: Check module programming and configuration settings, reprogram or replace module as needed
Estimated Repair Cost
$250 - $2,000
Parts + labor, varies by vehicle and location
Communication has been lost with special purpose vehicle control module A, which is an application-specific module for specialized vehicle functions such as ambulance, police, utility, or commercial vehicle equipment. The module is not responding on the network.
The most common cause of U0259 (Lost Communication With Special Purpose Vehicle Control Module "A") is: Special purpose control module A failure or internal fault
Typical repair costs for U0259 range from $250 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safety impact depends on the specific special purpose equipment. If module controls emergency lights, warning systems, or critical utility functions, loss of communication could compromise operational safety and legal compliance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0259 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.
