What Does U0491 Mean?
Invalid data is being transmitted from digital disc player/changer module D to other control modules on the vehicle network. This affects the fourth disc player in premium multi-zone entertainment systems.
Common Causes
45%
Defective disc player D module with internal component failure
25%
Damaged electrical connector or wiring harness at player D location
15%
Network bus communication issue affecting player D circuit
10%
Voltage supply problem or poor ground connection at player D
5%
Module programming error or software version mismatch
Diagnostic Steps
1
Step 1: Locate player D module (often in cargo area or fourth entertainment zone) and test operation
2
Step 2: Check power supply and ground circuits at player D with multimeter
3
Step 3: Inspect wiring and connectors for physical damage, corrosion, or loose connections
4
Step 4: Verify network communication functionality using scan tool live data from player D
5
Step 5: Replace player D module if electrical circuits pass testing and software is current
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
Invalid data is being transmitted from digital disc player/changer module D to other control modules on the vehicle network. This affects the fourth disc player in premium multi-zone entertainment systems.
The most common cause of U0491 (Invalid Data Received From Digital Disc Player/Changer Module "D") is: Defective disc player D module with internal component failure
Typical repair costs for U0491 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety impact on vehicle operation. Fourth zone disc player will not function but does not affect driving or critical systems.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0491 to identify the root cause.
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Quick Info
Category
Network
System
Infotainment/Premium Entertainment System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
