Need help trying to figure out what happened

Asked by GuruMNWM9 May 22, 2020 at 07:23 PM about the 2007 GMC Sierra 1500 SLE2 Crew Cab 4WD

Question type: Maintenance & Repair

My husband tried to install a bully dog in his 2007
GMC Sierra after he installed it the truck won't
crank. He took the bully dog out but it still won't
crank.

1 Answer

255,795

Put the bully dog back in and put it back to stock settings and see what happens. If nothing still works then it blew out all the factory programming and the vehicles systems will have to be reflashed by a GM dealer.

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