What Does U0248 Mean?
The main vehicle network has lost communication with the remote accessory module, which controls aftermarket or factory-installed accessories. This affects remote start, trailer functions, or other auxiliary equipment operation.
Common Causes
30%
Loose or corroded connector at remote accessory module
25%
Failed Remote Accessory Module
20%
Damaged wiring harness or improper installation
15%
Loss of power or blown fuse to accessory module
10%
Incompatible module programming or software version
Diagnostic Steps
1
Step 1: Verify all fuses for remote accessory module and check for proper voltage at module power supply
2
Step 2: Locate remote accessory module (location varies by vehicle) and inspect connector for corrosion or loose connection
3
Step 3: Verify module is properly programmed to vehicle using scan tool and check for software updates
4
Step 4: Test CAN bus communication at module connector and verify proper installation per manufacturer specifications
5
Step 5: If module is aftermarket, verify compatibility with vehicle; replace module if OEM and all tests pass
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The main vehicle network has lost communication with the remote accessory module, which controls aftermarket or factory-installed accessories. This affects remote start, trailer functions, or other auxiliary equipment operation.
The most common cause of U0248 (Lost Communication With Remote Accessory Module) is: Loose or corroded connector at remote accessory module
Typical repair costs for U0248 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally no direct safety impact unless accessories include safety features like trailer brakes or backup cameras. Vehicle primary functions remain operational.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0248 to identify the root cause.
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Quick Info
Category
Network
System
Accessory Control System / Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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