The wuauserv process or Windows Update Service enables the detection, download, and installation of updates for Windows and other programs. If this service is disabled, users of this computer will not be able to use Windows Update or its automatic updating feature, and programs will not be able to use the Windows Update Agent (WUA) API.

1] Run System Maintenance Troubleshooter

2] Run System Performance Troubleshooter

3] Run Windows Update Troubleshooter

4] Restart Windows Update Service

5] Flush SoftwareDistribution and Catroot2 folders

6] Troubleshoot in Clean Boot State

7] Use the Event Viewer

Timecodes:
0:00 Intro
0:28 Run System Maintenance troubleshooter
0:43 Run System Performance troubleshooter
0:58 Run Windows Updates troubleshooter
1:21 Flush content of SoftwareDistribution and Catroot2 folders
1:35 Clean boot

Read an in-depth article here: https://www.thewindowsclub.com/wuauserv-high-cpu-usage-windows

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