What Does U0549 Mean?
The vehicle network is receiving corrupted or implausible data from the Remote Accessory Module. This module typically controls aftermarket accessories, trailer functions, or remote-start features.
Common Causes
35%
Remote accessory module internal failure or water damage causing data corruption
30%
Damaged or shorted wiring between accessory module and network bus
20%
Aftermarket accessory installation causing network interference or voltage issues
10%
Poor ground or power supply connection at remote accessory module
5%
Software incompatibility or module programming error
Diagnostic Steps
1
Step 1: Locate remote accessory module and inspect for water intrusion, corrosion, or physical damage
2
Step 2: Check module power and ground circuits for proper voltage and continuity to clean ground point
3
Step 3: Disconnect aftermarket accessories one at a time to isolate potential interference sources
4
Step 4: Monitor CAN bus voltage and signal quality at remote accessory module connector
5
Step 5: Check for software updates or reprogram module if all electrical circuits test satisfactorily
Estimated Repair Cost
$175 - $750
Parts + labor, varies by vehicle and location
The vehicle network is receiving corrupted or implausible data from the Remote Accessory Module. This module typically controls aftermarket accessories, trailer functions, or remote-start features.
The most common cause of U0549 (Invalid Data Received From Remote Accessory Module) is: Remote accessory module internal failure or water damage causing data corruption
Typical repair costs for U0549 range from $175 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally no safety impact as this controls non-critical accessories. Vehicle can be driven safely, though some convenience features may not function properly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0549 to identify the root cause.
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Quick Info
Category
Network
System
Accessory Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
