What Does U0249 Mean?
The vehicle's communication network has lost contact with the rear entertainment control module. This module manages rear-seat audio, video, and entertainment features.
Common Causes
35%
Faulty or corroded wiring/connectors to rear entertainment module
30%
Failed rear entertainment control module
20%
Network bus termination or short circuit issue
10%
Poor ground connection at rear entertainment module
5%
Blown fuse or open circuit in module power supply
Diagnostic Steps
1
Step 1: Check fuses related to rear entertainment system and verify power supply to module
2
Step 2: Inspect wiring harness and connectors from module to main network, check for damage or corrosion
3
Step 3: Use scan tool to monitor network communication and verify module presence on CAN bus
4
Step 4: Test module ground connections for continuity and resistance
5
Step 5: If all connections are good, test rear entertainment module or substitute with known-good unit
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The vehicle's communication network has lost contact with the rear entertainment control module. This module manages rear-seat audio, video, and entertainment features.
The most common cause of U0249 (Lost Communication With Entertainment Control Module Rear "B") is: Faulty or corroded wiring/connectors to rear entertainment module
Typical repair costs for U0249 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety impact. Rear entertainment features will be inoperative but vehicle remains safe to drive.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0249 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Network Communication / Entertainment System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
