What Does U0168 Mean?
Communication has been lost between control modules and the vehicle security control module that manages alarm systems and security features. This disrupts the network's ability to coordinate anti-theft functions.
Common Causes
35%
Failed vehicle security control module
30%
Corroded or damaged wiring and connectors to security module
20%
Power supply fault or blown fuse to security module
10%
CAN bus network communication failure
5%
Module programming issue or configuration error
Diagnostic Steps
1
Step 1: Verify fuses related to security system are intact and check for power at security module connector
2
Step 2: Inspect wiring harness and connectors to security control module for corrosion, damage, or water intrusion
3
Step 3: Test ground circuits at security module for proper continuity to chassis ground
4
Step 4: Check CAN bus communication lines at security module using oscilloscope or multimeter for proper voltage levels
5
Step 5: Attempt to communicate with security module using scan tool; replace or reprogram module if no communication established
Estimated Repair Cost
$200 - $950
Parts + labor, varies by vehicle and location
Communication has been lost between control modules and the vehicle security control module that manages alarm systems and security features. This disrupts the network's ability to coordinate anti-theft functions.
The most common cause of U0168 (Lost Communication With Vehicle Security Control Module) is: Failed vehicle security control module
Typical repair costs for U0168 range from $200 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Security system may not function, leaving vehicle vulnerable to theft. May also prevent starting in some cases.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0168 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Security / Anti-Theft
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
