Anyone ever experience trying to start a 3.0 Duramax and it won’t fire? Starter engages and cranks engine but will not fire and start.
Yes, it’s at the dealer now. Truck is brand new. I’ll let you know, hopefully they can find something.I don't think I've heard about a crank/no-start yet.
Presumably you're getting a dealer to look at it.
Let us know what they find.
My suburban was doing that too. I found out that when I was in a hurry is when it would always happen. It appears to me I wasn’t giving the computers enough to wake up. Haven’t had this issue since I started getting in and putting my seatbelt on and pressing the brake pedal while doing so before I try to start the truck. It was doing it pretty regularly before that. I’ve been an automotive tech for over 20 years and have seen this type of problem with all kinds of vehicles since they got have gotten rid of the mechanical ignition switch. It seems even worse on vehicles with push button start. Hopefully this is your problem as there are many other factors that could beI have a 2021 GMC Sierra 1500 AT4 with the 3.0 Duramax that is 4 weeks old with 2500 miles. The following has happened three times. I press the brake, press the start button, the engine turns over for approximately 10 seconds without starting. Each of the three times it has started on the next attempt.
The dealer looked at it after the second time and could find nothing wrong.
After reading this thread it appears to be more than an isolated case.
Wow, what an eye opener. I've got a few bolts I'm going to check torque on based on that thread.There is a lengthier thread on this subject on the gm truck forum, see here: Won't start ?
There is a service bulletin about loose bolts connecting together the under hood fuse block. I have been having the same starting issues and found that mine were loose as well. It's only been a week or so, but have not had any failed start attempts since