What Is Wuauserv?
It is a vital component that helps keep your PC up to date with important security patches.
How to Disable It?
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If you dont want it to run on your rig, you could choose to disable it.
Here is how to do that:
Step 1: Typeservicesin theSearchbox to open it.
Then, you better click theStandardcategory.
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Step 2: Then, findWindows Update Serviceand right-click it to chooseProperties.
Step 3: Under theGeneraltab, you gotta change theStartup TypetoDisabledand click theApplybutton.
Then, you have disabled Windows Update Service successfully.

How to Fix Wuauserv High CPU Issue?
Wuauserv can also cause the high CPU issue.
How to fix the terrible issue?

Now, continue to read this post to find the answer.
Why is svchost.exe using so much CPU?
Fix svchost.exe high CPU usage (100%) Windows 10 with 4 solutions.
Tocheck for Windows updates, follow the next steps below.
Step 1: Right-click theStartmenu and chooseSettings.
Step 2: On theSettingswindow, selectUpdate & Security.
Step 3: Under theWindows Updatesection, click theCheck for updatesbutton to peek if there are any new updates.
Then Windows will search for available updates.
Just follow the on-screen instructions to finish the process.
Step 1: Open theSettingsapplication and then navigate toUpdate & Security>Windows Update.
Step 2: ChooseView update historyin the right panel and then clickUninstall updates.
Step 3: Right-tap the latest update that probably caused the issue and then chooseUninstall.
Step 4: Reboot your system and then see if the issue is fixed.
To do that, you might follow the steps.
Step 1:TypeCommand Promptin theSearchmenu.
Fix 4: Stop Wuauserv
you could also stop wuauserv.
The steps are introduced on thehow to disable itpart.
You just need to follow that guide to fix the issue.
Final Words
What is wuauserv?
Read here, you may have an overall understanding of it.
To be specific, the definition has being introduced.
Besides, you have known how to disable it and how to fix the high CPU issue.