What Does U0019 Mean?
A general fault has been detected on the low-speed CAN communication bus. This network typically handles non-critical systems like HVAC, body controls, and comfort features.
Common Causes
30%
Faulty module on low-speed network transmitting invalid data
25%
Damaged or corroded wiring in low-speed CAN harness
20%
Water intrusion causing intermittent communication faults
15%
Missing or incorrect termination resistor values
10%
Gateway module failure preventing proper network routing
Diagnostic Steps
1
Step 1: Monitor live data to identify which modules on low-speed network are not communicating
2
Step 2: Measure termination resistance between CAN High and CAN Low (should be approximately 60 ohms with modules connected)
3
Step 3: Inspect connectors at non-communicating modules for corrosion, bent pins, or loose connections
4
Step 4: Use oscilloscope to verify CAN signal quality and identify signal distortion or missing data frames
5
Step 5: Disconnect suspect modules one at a time to determine if a faulty module is disrupting the entire network
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
A general fault has been detected on the low-speed CAN communication bus. This network typically handles non-critical systems like HVAC, body controls, and comfort features.
The most common cause of U0019 (Low Speed CAN Communication Bus) is: Faulty module on low-speed network transmitting invalid data
Typical repair costs for U0019 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Low-speed network faults typically affect comfort and convenience features rather than critical safety systems. Vehicle can usually be driven safely but may have reduced functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0019 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
