What Does U0037 Mean?
Communication Bus B has a general fault preventing proper network communication. This indicates a problem with the secondary vehicle communication network, often used for body control, convenience, or infotainment systems.
Common Causes
35%
Failed module on Bus B creating network disruption
30%
Open circuit or damaged wiring in Bus B network
20%
Corroded or loose connector on Bus B network
15%
Missing or incorrect terminating resistor on Bus B
Diagnostic Steps
1
Step 1: Identify which modules are on Bus B network using wiring diagrams or technical service information
2
Step 2: Monitor live data to determine which modules are communicating and which have dropped off the network
3
Step 3: Measure Bus B voltage levels at network connectors (should be approximately 2.5V on each line at idle)
4
Step 4: Check terminating resistor values between CAN-H and CAN-L (should measure 60-120 ohms total)
5
Step 5: Disconnect modules one at a time to isolate faulty module causing network disruption
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
Communication Bus B has a general fault preventing proper network communication. This indicates a problem with the secondary vehicle communication network, often used for body control, convenience, or infotainment systems.
The most common cause of U0037 (Vehicle Communication Bus B) is: Failed module on Bus B creating network disruption
Typical repair costs for U0037 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Typically affects non-critical systems like comfort features, infotainment, or climate control. Vehicle usually remains drivable 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 U0037 to identify the root cause.
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Quick Info
Category
Network
System
CAN Bus Network B Communication
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
