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PCI Bus Subsystem failure. Diagnostic test Dell 5421
Hi,
I'm running Online Diagnostic test and I have one error which is PCI Bus Subsystem. But when I run the pre-boot diagnostic test it says that all passed. What should I do with the PCI Bus Substem failure
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Posted March 11th, 2026 10:55
They still don't have any solutions for this??? seems like a hardware problem... Tried all the YouTube fix tutorials. Some tutorials worked, but the same problem is coming again
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Posted March 11th, 2026 18:20
@Pratheesh18 Link to my previous post
This is a motherboard failure. There is no solution. The motherboard needs to be replaced.0
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Posted March 11th, 2026 18:29
Yes, this is what I had to do. Luckily mine was still under warranty when it happened.
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Posted March 12th, 2026 08:37
@NYHusker It may very well be. But being as I have been using my now 10 year old Aurora with little or no problems since the two years I found out about it ago, it would seem that in some instances it isn't the catastrophe it would seem.
And as I have no intention of springing £2500 for a new desktop I will be finding out if it persists on Windows 11 later this year.
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Posted March 12th, 2026 09:37
Hi,
i had the same problem 4 years ago, could not get it solved, laptop was out of warranty, so no support...the problem still exists , but laptop is still as efficient as it was 4 years ago...its a problem which can be lived with, if nobody is willing to help...
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Posted June 27th, 2022 11:00
Try updating and installing the chipset drivers at the 5421 support page here. Make sure to download the driver for the OS that you are using.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop
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Posted July 9th, 2022 15:00
Same issue here, please let me know if you get a result.
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Posted September 6th, 2022 12:00
Yes! I have the EXACT same problem!
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Posted October 9th, 2022 10:00
Resolution by Jesse L did not work
Jesse L (retired)
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Posted July 21st, 2022 05:00
LuciMaze,
Click here and install the updated driver.
Jesse L (retired)