My 2006 gmc Sierra won't start sometimes. I have to recode the key and it starts right up and is fine for a couple of months and then it won't start again and I have to recode again. What could be the reason for this?

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GMC Sierra 1500 Questions - Truck suddenly stops running ...

www.cargurus.com > Questions > GMC > Sierra 1500

CarGurusJul 11, 2013 - Truck suddenly stops running, acting like it's out of fuel. ... start it and let it run until it dies then check the pressure and shut the key off. ... Was running fine and then turned off as if the ignition was turned of. .... Well mine was a loose battery connection that just shut down the vehicle completely while driving.

1998 1500 5.2 Shuts Off Randomly - CarGurus

www.cargurus.com > Questions > Dodge > Ram 1500

CarGurusAug 29, 2011 - I let it sit for a second then tried to start it back up and it wouldn't start.... 2006 ram 1500 randomly dies while driving 13 answers ... truck started outrunning fine but would randomly die. wait a few ... Used GMC Sierra 1500".

GMC Sierra 1500 Questions - started stalling and dying ...

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CarGurusJul 28, 2008 - The truck starts and dies. Have to give a little gas to keep running.While driving have to 2 foot it so it won't die. Wants to die when I come to a ...

Engine Dies and Then Starts Right Back Up

www.justautorepair.com/chevrolet/blazer/stalls-starts-up

Check plugs,wires,coils.

What have you checked so far ?
Is the coil getting power and a ground signal ?

The security light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. Remember too, the TDM controls the security light. Sometimes you can have ALL the symptoms and no lights.
This link may help you.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

When you turn the ignition to start, do you hear the starter turning and the solenoid engaging the flywheel ? test your starter by jumping it and see if the engine turns over. If this works, then you might consider in checking fuel pressure. Do you have any codes in your ECM ?

The first thing I would check is fuel pressure. This type of fuel injection requires a minimum fuel pressure in order to operate. If fuel pressure is as little as one psi below minimum the vehicle will not start. You can try squirting a couple of shots of carb spray into the air snorkel while somebody cranks the engine over. If the engine starts and then dies you now you fpdeffinetely have a fuel issue. If the engine still won't start check for spark. Let me know what you find. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

does it turn over or does it do nothing at all

have u had the starter tested

If you are at or near the 100,000 mile mark then your fuel pump may have failed. If you remove the fuel filler cap and listen carefully at the filler neck while someone turns the ignition key to "run" [don't actually crank the engine] you should be able to hear the fuel pump buzz for about a second and a half as the key is turned On. If you don't hear the pump buzz then odds are your pump is dead. Your pump may have actually failed making it appear as though you ran out of fuel. Not to uncommon. Hope this helps and good luck!

Sounds like a weak fuel pump. Have you checked fuel pressure? It should be at least 50 psi key on engine off.