Delete one Key Fob or delete all and re add?

[Rollerbones]

Got a used 2021 Tahoe that came with one key fob. Had a new one made for it but it is considered "Key Fob 3" so I can't save seat position#2 to it.

How can I delete the old Key Fob that is missing so I can set my #2 profile?

I do have a TechLine Connect account for my VIN and J2534 Bosch Mastertech II interface.
If I go into immobilizer module it seems I would have to delete ALL fobs and only program the 2 (no way to delete just one),

I want to make sure I can do this before deleting them out and not sure how/if I can re add. Does anyone have instructions for something like this?

 

[Joseph Garcia]

When you finish testing out the options and still do not have a solution, take the truck and FOBs to a local locksmith, and they will get you straightened out for about $25.

 

[kyomie]

I just did this today through Techline connect. You have to have two keys to complete the process. They can be keys that are already programmed and you're deleting. There will be a 10 minute lockout process upfront, but after that you can program the keys. The keys will need to be placed in the cupholder closest to the driver to program the keys.