Updated 2021/2022 4500 Cab Chassis

[ls2trailblazer]

I have a 2022 4500 Cab Chassis that I’m working on. Truck has already been ECM swapped with a 2021 ECM and tuned. Unfortunately the dash looks like a Christmas tree and sometimes the truck goes into limp mode when towing heavy. I’ve read online that the ECM needs cloned before swapping, but I don’t know if they did that. I’ve also read that the cab chassis are a bit different. Does anyone have any suggestions?

[dcmechanical]

I can’t give you a hand if you still need it

[ls2trailblazer]

I can’t give you a hand if you still need it

I tried private messaging you but it won