2005 O/D Button issue

Hi All -

I recently had my center carrier bearing and U joint replaced on my Tundra (Auto, 4.7 LTD DblCab). While it fixed the vibration that was happening, now it seems at any speed once I get through even a couple of years, when I hit the button there's no changing RPM and it feels like nothing is engaging.

Is this something as simple as maybe a cable or part of a wiring harness getting disconnected?
I honestly don't know and unlike my last query, I'm not gonna just jump to conclusions, shade tree mechanic that I am.

Also, some thing that didn't exist before I had this work done is the check engine light is on and it tells me the code thrown is for the knock sensor 2.
Are the two connected?

Thanks -

 

Sharing the link to this discussion ongoing in the 1st Gen forum...

https://www.tundras.com/threads/knock-sensors-plus.123456/#post-3162675