What Does U055A Mean?
A control module has received corrupted or implausible data from Special Purpose Vehicle Control Module A on the network. This module varies by manufacturer and vehicle application but typically controls specialized equipment or vehicle-specific functions.
Common Causes
35%
Failed or failing special purpose control module with internal faults
30%
Damaged wiring harness or corroded connectors to the special purpose module
20%
CAN bus communication network faults or interference
10%
Module software corruption or version mismatch after repairs
5%
Intermittent power supply or voltage fluctuations to module
Diagnostic Steps
1
Step 1: Identify the specific Special Purpose Control Module A for your vehicle application using service information (could be cargo management, auxiliary equipment, upfitter module, etc.)
2
Step 2: Monitor live data stream from the module to determine which specific parameters are showing invalid data
3
Step 3: Perform thorough visual and electrical inspection of module connectors, wiring, and grounds; measure voltage supply and ground integrity
4
Step 4: Check CAN bus network signals with oscilloscope at module connector; verify proper bus voltage (typically 2.5V dominant, 3.5V recessive)
5
Step 5: Attempt module reprogramming if available; substitute known-good module if possible to isolate fault; replace module if confirmed defective
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
A control module has received corrupted or implausible data from Special Purpose Vehicle Control Module A on the network. This module varies by manufacturer and vehicle application but typically controls specialized equipment or vehicle-specific functions.
The most common cause of U055A (Invalid Data Received From Special Purpose Vehicle Control Module "A") is: Failed or failing special purpose control module with internal faults
Typical repair costs for U055A range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safety impact depends on the specific function controlled by this module. May affect specialized equipment operation or vehicle-specific features that could be safety-related in certain applications.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U055A to identify the root cause.
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Quick Info
Category
Network
System
Communication Network / Special Purpose Equipment
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
