Need new computer, need help.

My 2003 yukon xl denali needs a new computer. One of the internal 5volt references is no longer sending 5volts.
My question, can I plug in a new computer and install the factory tune or will it need to be bench tuned before installation?

I did a quick search, so if I missed this info, I apologize.
Any help is appreciated.

You can take your current tune, full flash it into your new PCM and be good to go. If your new PCM is Blue/Green connectors.

But can i install the computer and flash through the ob2 port or do I need to do it before it is installed?
Thanks for the reply.

Woops. missed that part..

Yea i havent had a issue flashing it like that thru the OBD port.

Awesome, thank you so much!

I've flashed other people's computers by screwing them into my truck and going through the OBDII port. I finally picked up an extra set of connectors to build a bench harness though.