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Question: Apple diagnostic PPN001. Fan running high, computer slow

Can anyone advise what should be done.

Apple diagnostic PPN001. Fan running high, computer slow.

MacBook Air, iOS 11.3.1

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May 27, 2018 8:33 AM in response to Sepillay In response to Sepillay

Apple Hardware Test – Invoke and Interpret


Apple Hardware test – How to run and interpret (2)


Apple Diagnostics: Reference codes

Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time. You may need to do this 2-3 times.

Reset NVRAM/PRAM


Try a SMC reset. The article covers when this is required, but doing this will not affect anything.


Reset SMC

May 27, 2018 8:33 AM

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Question: Apple diagnostic PPN001. Fan running high, computer slow