E92 ECM environmental ID reset?

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,205
155
63
Texas!!!
My buddy has a 2016 Sierra he bought wrecked and has fixed. It seems maybe the ECM was damaged in the accident even though it doesn't show any visible damage because it is keeping the ECM relay powered on even after the key is turned off. Running the diagnostics for the code points to a bad ECM. We have another ECM from another truck, but the environmental IDs GM uses for the theft system is making it difficult to swap it into this truck. Does anyone know if there is a way to clear that from the ECM?
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
18,206
440
83
Phoenix Az
You would need to flash a calibration in to the used ecm to set the ecm up for a new vehicle. Pretty sure there is a way to do this with an mdi2 and gm tis.

The ID’s are gm’s way of keeping “a thief” from swapping in parts to make a vehicle run so it’s hard set into the ecm once set to take (switch is open when new, sees ID, saves data, switch closes and can’t be opened).

Nothing set in stone on GM service info on how to fix this other than buy a new ecm but I’ll keep digging
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
18,206
440
83
Phoenix Az
I don’t think you can program over it, Josh. Looks like you will have to get a new one and find the ID’s to program into the new one.


 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,205
155
63
Texas!!!
I thought the BCM woke up the ECM.
In the old system, it was a simple communication between the ignition switch, bcm, and ecm, but now it is like stated in the post James posted screenshots of. There are a bunch of modules that use the environmental ID, and if one of them doesn't match, the truck won't run.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
18,206
440
83
Phoenix Az
yeah this started in 2010 in some vehicles and progressed from there. real pain in the ass
 

dndj

Boost!
Apr 13, 2019
247
21
18
Oregon
Totally sucks. Really kills the used ECM/TCM etc market and the idea of doing module swaps for simple troubleshooting purposes.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)