Where is the tcm located on this 2500 gmc savana dont know where to look

Hello, seeking the location of any control module without performing necessary testing to determine what is actually wrong with your vehicle is quite premature. I would suggest that testing is needed to determine what is happening causing the "limp mode" to be engaged as you are assessing. A good diagnostic tool can interface with all the related processors to see what each component is doing - and which ones are acting as designed and which ones are not. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops