Serial UART Support Library (SerCx2) Service Defaults in Windows 8

Serial Class Extension V2 by Microsoft Corporation.

Default Settings

Startup type:Manual
Display name:Serial UART Support Library
Service name:SerCx2
Service type:kernel
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SerCx2

Default Behavior

The Serial UART Support Library service is a kernel device driver. In Windows 8 it will not be started until the user starts it. If Serial UART Support Library fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the SerCx2 service hasn't been started.


Serial UART Support Library can't start, if the Microsoft ACPIEx Driver service is disabled or not available.

Restore Default Startup Configuration for Serial UART Support Library

Before you begin doing this, make sure that all the services on which Serial UART Support Library depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config SerCx2 start= demand

3. Close the command window and restart the computer.

The SerCx2 service is using the SerCx2.sys file that is located in the %WinDir%\system32\drivers folder. If the file is corrupted or deleted, you can put it back in there.