update ecu and tcm at dealership?

[apollo18]

i read that sometimes the ecm, tcm, and transfer case updates for our trucks can improve driveability. my truck hasnt been to the dealer in a while, if i ask them to update my ecu, tcu, and any other computer module, can they do it in an hour? or will they not do that becuase they want a diagnostics first. Im guessing I need someone with a tech 2 to update these modules. I have a transmission shifting problem so thats why im hoping it will fix that or improve driveability.

[Jsdirt]

Any garage with programming capability can do this for you. Does NOT have to be with a Tech 2!

 

Anybody with a J-box and a laptop, and the $55 fee to GM can do this.

 

My recommendation is, if it ain't broke DON'T FIX IT.

[tbarn]

If its under warranty, take it in and have them address the trans issue. Leave the rest alone. Sometimes programming makes things worse.