What Does U0494 Mean?
The receiving control module has detected invalid or corrupted data being transmitted from the primary digital audio control module over the communication network. This indicates a breakdown in communication integrity between infotainment components.
Common Causes
35%
Internal failure of digital audio control module hardware or software corruption
25%
Wiring harness issues between audio module and communication bus
20%
Poor ground connection at audio control module
12%
Low voltage supply to audio module causing data transmission errors
8%
Software version mismatch between audio module and other network modules
Diagnostic Steps
1
Step 1: Verify power and ground circuits at digital audio control module; check for proper voltage (12V+) and clean ground (less than 0.1V resistance to battery negative)
2
Step 2: Inspect wiring harness connectors at audio module for corrosion, bent pins, or moisture intrusion
3
Step 3: Monitor CAN bus communication using scan tool; verify audio module is transmitting on the network
4
Step 4: Check for software updates available for audio control module and related infotainment components
5
Step 5: Perform module replacement test if all communication circuits test normal; reprogram new module as needed
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The receiving control module has detected invalid or corrupted data being transmitted from the primary digital audio control module over the communication network. This indicates a breakdown in communication integrity between infotainment components.
The most common cause of U0494 (Invalid Data Received From "Digital Audio Control Module A") is: Internal failure of digital audio control module hardware or software corruption
Typical repair costs for U0494 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety concern. Audio and entertainment functions may be inoperative or intermittent, but vehicle can be driven normally.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0494 to identify the root cause.
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Quick Info
Category
Network
System
Infotainment/Audio System
Difficulty
Type
Generic (SAE)
Recommended Tools
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