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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2008 GMC Acadia crank NO START!!!

  • Cobie1990
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1 week 4 days ago #92264 by Cobie1990
2008 GMC Acadia crank NO START!!! was created by Cobie1990
I been learning from you for while now and been fixing alot of no cranking and starting cars but I've ran into a 2008 GMC Acadia that flips ECM authentication from Valid to unknown. The car have no faults codes for communication errors. Im using a GM dealer key and ECM was replace by dealer and theft deterrent module and was programmed but key just wont stick. Any help on that?

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  • Chad
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1 week 2 days ago - 1 week 2 days ago #92269 by Chad
Replied by Chad on topic 2008 GMC Acadia crank NO START!!!
Do you have a scan tool that will communicate with the TDM? If so, post some screenshots of the available pids.
 
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)
Last edit: 1 week 2 days ago by Chad.

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