What Does U0055 Mean?
A general communication fault has been detected on vehicle communication bus D. This indicates that modules are unable to communicate properly on this network segment.
Common Causes
30%
Damaged or corroded wiring on bus D circuit
25%
Faulty module on bus D network causing communication disruption
20%
Loose, corroded, or disconnected connector on bus D
15%
Missing or failed terminating resistor on bus D
10%
Short circuit or open circuit in bus D wiring
Diagnostic Steps
1
Step 1: Identify which modules communicate on bus D using wiring diagram for the specific vehicle
2
Step 2: Check voltage levels on bus D lines (typically 2.5V nominal for CAN networks)
3
Step 3: Verify terminating resistors are present at both ends of bus D (typically 60 ohms total)
4
Step 4: Inspect all connectors and wiring for bus D circuit for damage or corrosion
5
Step 5: Disconnect modules one at a time to identify if a specific module is disrupting the bus
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
A general communication fault has been detected on vehicle communication bus D. This indicates that modules are unable to communicate properly on this network segment.
The most common cause of U0055 (Vehicle Communication Bus D) is: Damaged or corroded wiring on bus D circuit
Typical repair costs for U0055 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Depending on vehicle design, bus D may control comfort features or safety systems. Identify affected systems and repair accordingly to maintain full vehicle functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0055 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
