No start

2021 Tundra purchased in Nov , decided to upgrade to a dual battery setup. Purchased the Genesis brand, hardest part of install was moving the fuse box an inch to accommodate the new batteries. Finished everything and no start, key fob works, powers up, doors lock and unlock, app will not start it nor lock or unlock the doors. Its at the dealership they tested all the fuses and relays. Any info?

 

I dont know much past 2019. But it sounds like its not registering your fob. I know with the 2019, not only do you need to register the buttons on the fob with techstream but also the chip in the key to start the ignition. When i first tried registering keys on techstream I programmed the buttons and they worked but I still could not start the truck, it would just crank. I needed to go into a different section in techstream and program the chip in the key. My guess would be that the new push to start has an option in techstream for the dealer to register you fob. I'm just guessing though. Maybe having your batteries disconnected during the install the cpu forgot your fob for the push to start? This is why is hope to never have a vehicle without a key, the chip stuff is bad enough to deal with. Have you tried going back to stock setup to troubleshoot?

 

Welcome from NY.
Hopefully it's a quick easy fix.