If you are reinstalling SCCM on the same hardware with same site code..

If you are reinstalling SCCM on the same hardware with same old site code then refer this link


It's not best practice nor is it supported to re-use site codes. It's best if you make site codes totally random. Nobody will ever see the secondary site code except for the SCCM admin.

Site codes are a bigger deal on primary sites. In that case you CAN NOT reuse them because the site code is appended to all package, advertisement, etc. This would be a major problem because they could end up being duplicated from the old environment to the new one which would wreak havoc on your clients. 

Where you want to replace a primary they only way to reuse that site code is to restore the primary site from the SCCM backup created on the server before it died.

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