What Does U1149 Mean?
Similar to U1148, this indicates a secondary audio control data communication failure on the J1850 SCP bus. May represent a different audio message ID or additional audio system integration issue.
Common Causes
40%
Failed or corrupted radio/audio control module
25%
Damaged SCP bus wiring or connectors at audio components
15%
Faulty instrument cluster not relaying audio information
15%
Poor ground connection at radio, amplifier, or related modules
5%
Body control module or gateway module communication fault
Diagnostic Steps
1
Step 1: Compare U1148 and U1149 parameters in scan tool to identify which audio message is failing
2
Step 2: Verify all audio-related modules (radio, amplifier, cluster) are visible on SCP network using scan tool
3
Step 3: Check for aftermarket radio installation or modifications that may affect network communication
4
Step 4: Test SCP bus termination resistance (should be approximately 100-120 ohms between both bus lines)
5
Step 5: Perform audio system reset or reconfiguration through scan tool; replace audio module if communication cannot be restored
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
Similar to U1148, this indicates a secondary audio control data communication failure on the J1850 SCP bus. May represent a different audio message ID or additional audio system integration issue.
The most common cause of U1149 (SCP (J1850) Invalid or Missing Data for Audio Control) is: Failed or corrupted radio/audio control module
Typical repair costs for U1149 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety concern. Loss of audio functionality may reduce driver awareness of navigation prompts or phone calls.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1149 to identify the root cause.
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Quick Info
Category
Network
System
Audio/Infotainment Network Communication
Difficulty
Type
Manufacturer
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