Swapping engine

[Ahmed]

Hi guys 

I have Sierra 2015 regular cap 

I swapped the engine to 6.2 2016 

after swapping the engine I downloaded a basic 6.2 tune on my truck but there is something went wrong with the car 

the cruise control is not working 

I changed the brake switch 

still didn’t work 

so i don’t know what to do 

 

And thanks 

[davester]

Did everything work ok after you installed the 6.2, but before you installed the tune?

[Ahmed]

I swapped the engine and installed the basic 6.2 tune and it didn’t work after

but also couldn’t reprogrammed the transmission 

Give me error when I checked via hptuner 

 

one of my friend he did the same and everything is working fine with him 

[davester]

sounds like you need to figure out why the tcm couldn't be reprogrammed (plug is loose, wire in pinched/broken/shorted), as it's important for the ecm and tcm to work together.