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Truck will not start

Tiny
1S773M
  • MEMBER
  • 2009 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
When I turn the key to the crank position the starter cranks the engine over, but it will not fire or start. When I move the key to the on position, the starter continues to crank the engine over until I move the key to the off position. I have replaced the battery, the starter, and the ignition switch. If I spray starting fluid in the intake, the engine still does not fire.
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Wednesday, October 10th, 2018 AT 8:11 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

It sounds like the PCM has gone bad. Lets run the codes to confirm the issue. Here is a guide and the location of the PCM. You will need to get it programmed which you can have that done from where you order the new one from have your VIN number ready.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Here are the starter wiring diagrams so you can see how the system works.

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Thursday, October 11th, 2018 AT 3:06 PM

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