What Does U055B Mean?
A control module has received corrupted or implausible data from Special Purpose Vehicle Control Module B. This represents a communication data integrity issue with a secondary specialized control module whose function varies by vehicle type and application.
Common Causes
35%
Faulty special purpose control module B with internal communication errors
30%
Corroded connectors or damaged wiring to the special purpose module
20%
CAN bus network issues affecting data transmission quality
10%
Software or firmware issues within the module
5%
Unstable power supply or electrical system issues
Diagnostic Steps
1
Step 1: Consult vehicle-specific service information to identify what Special Purpose Control Module B controls in your particular vehicle
2
Step 2: Use scan tool to monitor real-time data from module B and identify which data values are invalid or out of specification
3
Step 3: Inspect all electrical connections to module B for corrosion, damage, or poor contact; verify power and ground circuits with multimeter
4
Step 4: Test CAN bus integrity at module connector using oscilloscope; check for proper signal amplitude and absence of noise or distortion
5
Step 5: Perform module reflash/reprogramming if applicable; replace module if all connections and network parameters are verified good
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 B. This represents a communication data integrity issue with a secondary specialized control module whose function varies by vehicle type and application.
The most common cause of U055B (Invalid Data Received From Special Purpose Vehicle Control Module "B") is: Faulty special purpose control module B with internal communication errors
Typical repair costs for U055B range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safety implications vary based on the specific function of Module B in the vehicle. Could affect specialized equipment operation or auxiliary systems that may have safety relevance depending on application.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U055B 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.
