What Does U0427 Mean?
The receiving module is getting corrupted or implausible data from the vehicle security/alarm control module via the communication network. This affects anti-theft system functionality and may cause security features to malfunction.
Common Causes
35%
Faulty vehicle security control module
30%
Damaged or corroded wiring/connectors in CAN network to security module
20%
Low voltage or poor ground connections at security module
10%
Software version incompatibility or corrupted firmware
5%
Aftermarket alarm or security system interference
Diagnostic Steps
1
Step 1: Check for multiple U-codes to determine if issue is isolated to security module or network-wide
2
Step 2: Verify battery voltage and all fuses related to security system; test ground connections
3
Step 3: Inspect wiring harness and connectors to security control module for physical damage or corrosion
4
Step 4: Check for aftermarket security devices that may interfere with factory system communication
5
Step 5: Use factory scan tool to monitor security module data stream and test module functionality; reflash or replace as needed
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The receiving module is getting corrupted or implausible data from the vehicle security/alarm control module via the communication network. This affects anti-theft system functionality and may cause security features to malfunction.
The most common cause of U0427 (Invalid Data Received From Vehicle Security Control Module) is: Faulty vehicle security control module
Typical repair costs for U0427 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle security features may not function properly, increasing theft risk. May cause unexpected no-start conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0427 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Security / Anti-Theft System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
