Suburban

[1320bighead]

Hey there everybody new member to this form wanted to see if I can get some help I put a Duramax 05 motor on a 2003 Suburban everything works fine it starts and everything but check engine light is on and will not move because there's no communication with the TCM heard on one of these forms that there must be some wiring movements wondering if anyone can help with some information I would gladly appreciate it

 

[Kriesel]

You need to provide constant, fused, power to the TCM. Connect a line to power on the bottom of the underhood fuse block, run it through a 10amp fuse to the two wires on fuse block C2, also underhood. Haynes manual or Alldata.com for wiring diagrams.