What Does U0002 Mean?
The High Speed CAN bus is operational but experiencing performance degradation such as intermittent communication, slow data transmission, or signal quality issues. This indicates the network is functioning but not at proper specifications.
Common Causes
30%
High resistance in CAN bus connections or terminals
25%
Partial damage to CAN bus wiring causing signal degradation
20%
Electromagnetic interference affecting signal quality
15%
Weak or failing control module with degraded communication capability
10%
Incorrect termination resistance value
Diagnostic Steps
1
Step 1: Monitor CAN bus signals with oscilloscope to check for signal integrity, proper voltage levels, and wave form quality
2
Step 2: Measure voltage drop across CAN High and CAN Low circuits while wiggling harnesses to identify intermittent connections
3
Step 3: Check all CAN bus connector terminals for corrosion, looseness, or damage
4
Step 4: Verify termination resistance is within specification (58-62 ohms typically)
5
Step 5: Monitor freeze frame data to determine if performance issues occur under specific conditions
Estimated Repair Cost
$120 - $800
Parts + labor, varies by vehicle and location
The High Speed CAN bus is operational but experiencing performance degradation such as intermittent communication, slow data transmission, or signal quality issues. This indicates the network is functioning but not at proper specifications.
The most common cause of U0002 (High Speed CAN Communication Bus Performance) is: High resistance in CAN bus connections or terminals
Typical repair costs for U0002 range from $120 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience intermittent loss of functions including safety systems. Should be diagnosed promptly as condition may worsen and lead to complete communication failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0002 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
