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Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 22666
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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It starts right up but runs for 3 seconds and shuts off as

Customer Question

It starts right up but runs for 3 seconds and shuts off as if I turned the key off
JA: Is the car in "Park" or "Neutral?" Do you know if your car has a "wheel lock" feature?
Customer: it's in park , of course it has a steering lock feature
JA: What is the model/year of your Chevy?
Customer: 07 2500 HD duramax
JA: Are you fixing your 2500 yourself? What have you tried so far?
Customer: fixing it myself , looked for blown fuses but not sure which ones to look for, disconnected the batteries and reconnected but didn't help.
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 10 months ago.
Category: Chevy
Expert:  sprinkles08 replied 10 months ago.

Hello and welcome to JustAnswer!

It is starts, runs for 2-3 seconds and dies abruptly like the key was shut off then the problem is almost surely security related and you're losing injector pulse. Do you have a second key to try?