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Pete, GMC Mechanic
Category: GMC
Satisfied Customers: 27838
Experience:  GM training and dealer tech for 14+ years. Diagnostics
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GM sierra: my 2005 6.6 engine has . ive put a 2003 6.6

Customer Question

my 2005 6.6 engine has blown. ive put a 2003 6.6 in its spot. I cant get it to run. is there some thing in the wiring harness that needs to be changed to get it to run?
Submitted: 2 years ago.
Category: GMC
Expert:  Pete replied 2 years ago.
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
If your security light is flashing (it may say security or anti theft or may be a picture of a car with a lock across it) this is the vehicles theft system that has engaged and is causing this issue here.If this is the case a theft relearn will need done.If this is what is occurring here let me know.
If this is not what is occurring check and make sure all fuel line feeds from the fuel tank to the fuel filter are tight with no leaks as this will cause this fault here as the fuel injection pump will suck air and fuel if this is the case and cause this here.If this is all found to be o.k. let me know.
Thanks Pete