What Does U0194 Mean?
Communication with the secondary digital audio control module (Module B) has been lost. Vehicles with premium sound systems often use multiple audio control modules for different zones or channels.
Common Causes
35%
Audio control module B internal failure
30%
Wiring harness damage or connector corrosion
20%
Power supply or ground circuit fault
10%
Network communication bus failure
5%
Module mounting location water damage
Diagnostic Steps
1
Step 1: Check fuse and relay for audio module B, verify voltage at module connector
2
Step 2: Inspect connector and wiring for physical damage, especially if module is trunk or rear-mounted
3
Step 3: Measure resistance between module ground and battery negative terminal
4
Step 4: Use scan tool to check if Module A (U0193) is communicating properly to isolate network vs module issue
5
Step 5: Test suspect module by substitution if possible or perform resistance checks on module circuits
Estimated Repair Cost
$250 - $1,500
Parts + labor, varies by vehicle and location
Communication with the secondary digital audio control module (Module B) has been lost. Vehicles with premium sound systems often use multiple audio control modules for different zones or channels.
The most common cause of U0194 (Lost Communication With "Digital Audio Control Module B") is: Audio control module B internal failure
Typical repair costs for U0194 range from $250 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety concerns. Only impacts premium audio features with no effect on vehicle safety systems.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0194 to identify the root cause.
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Quick Info
Category
Network
System
Audio/Entertainment System
Difficulty
Type
Generic (SAE)
Recommended Tools
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