Make sure that your ModelIdentifier.plist file is kept safe in Users Folder. If You have used my tutorial:

Terminal Method of Fixing Kernel_Task RAM / CPU / Memory Problem in Mac

then your ModelIdentifier.plist file is safe in the Users Folder.

But if you have used my other tutorial i.e. manual method of fixing Kernel_Task Memory problem:

Fixing kernel_task taking up RAM / Memory / CPU Problems in Mac OS X

then you need to move your ModelIdentifier.plist file to Users folder before using the following Commands.

Or, you can use manual method of fixing if it appears again:

Fix Kernel_Task memory Problem, If it Reappears again

 

You can access Users Folder by going to your Master Drive. Then go to Users and Paste your ModelIdentifier.plist file.

 

Command to move your ModelIdentifier.plist file from Users folder to Resources Folder:

sudo mv /users/MacBookPro8_2.plist /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/ACPI_SMC_PlatformPlugin.kext/Contents/Resources/

 

cd Command to change the directory to Resources:

cd /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/ACPI_SMC_PlatformPlugin.kext/Contents/Resources/

 

mv Command to move your ModelIdentifier.plist file back to Users folder:

sudo mv YourModelIdentifier.plist /users

[Please Replace YourModelIdentifier.plist with Your Model Identifier.plist  name. Like mine was MacBookPro8_2.plist. In My Case the command will be: sudo mv MacBookPro8_2.plist /users]

 

Keep your ModelIdentifier.plist file safe in your Users Folder as you may need it incase Kernel_Task Memory issue arises again. Its only few time that the problem reappears, you can use this tutorial to fix it.

 

Alternetively you can also use the following tutorial to solve it manually:

Fix Kernel_Task memory Problem, If it Reappears again