changed ecm, now wont start! HELP!!

H

hasher

New member
Jan 7, 2010
5
0
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i just joined this forum for some help(sounds like smart people on here)!
we are just a small repair shop and not to familular with the chev duramax.
we had a guy towed in with an 05 chev 2500 crewcab, 6.6 lly ,auto.
the ecm and other parts under the front right of the pickup were smashed. we replaced all the parts and the ecm from another 05 chev 6.6l, but now the truck cranks over but will not start. the security light on the dash flashes. i was told to change the big black box that is under the steering colum(elec chas cntrl mod) with one from the same truck the ecm came from (wrecking yard), so we did. and still wont fire!
can u guys help?
we dont have a local gm dealer. (in the boonies, Canada)
how do we get it to re learn the ecm?
please use lamans terms and spasifics please
thanks
greg
gt auto
 
paint94979

paint94979

Beer Nazi
Sep 18, 2006
11,714
7
38
37
hasher said:
i just joined this forum for some help(sounds like smart people on here)!
we are just a small repair shop and not to familular with the chev duramax.
we had a guy towed in with an 05 chev 2500 crewcab, 6.6 lly ,auto.
the ecm and other parts under the front right of the pickup were smashed. we replaced all the parts and the ecm from another 05 chev 6.6l, but now the truck cranks over but will not start. the security light on the dash flashes. i was told to change the big black box that is under the steering colum(elec chas cntrl mod) with one from the same truck the ecm came from (wrecking yard), so we did. and still wont fire!
can u guys help?
we dont have a local gm dealer. (in the boonies, Canada)
how do we get it to re learn the ecm?
please use lamans terms and spasifics please
thanks
greg
gt auto
Click to expand...

do you have a Tech II or EFI Live?
 
H

hasher

New member
Jan 7, 2010
5
0
0
so will this have to be done every time we start the truck, or just once only, then it will start normaly?
after the truck is running and driving, will a scan tool (like our snapon scaner, or a gm dealer's tool) read the original truck vin, or the vin from the wrecking yards truck? cuz then it would have to get that changed id imagine.


i still dont understand why it wouldnt start even with both the ecm and the bcm(the black box under the stearing colum) swaped out from the same donner truck from the wreckers. is there another module we need to change so it would work?
thanks
greg
gt auto


much gratitude for everyones help
 
Kat

Kat

Wicked Witch of the West
Aug 2, 2006
17,899
13
38
59
Norco, CA
hasher said:
so will this have to be done every time we start the truck, or just once only, then it will start normaly?
after the truck is running and driving, will a scan tool (like our snapon scaner, or a gm dealer's tool) read the original truck vin, or the vin from the wrecking yards truck? cuz then it would have to get that changed id imagine.


i still dont understand why it wouldnt start even with both the ecm and the bcm(the black box under the stearing colum) swaped out from the same donner truck from the wreckers. is there another module we need to change so it would work?
thanks
greg
gt auto


much gratitude for everyones help
Click to expand...

No, the emergency relearn will only have to be done once. Then it should start and run like normal.
 
H

hasher

New member
Jan 7, 2010
5
0
0
thanks for everyones help. we did the key cycles and the truck came to life(on the second try).
this is a grate forum and will use it again when stuck with a problem.
thanks once again!
greg
gt auto
:hello:
 
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