Cranks won't start

The security light comes on some times and stays on until I shut the engine off. When the light comes on is when the starting problem happens. The security light was coming on 2 days, every time I drove it, prior to the no start. Are they related?

The truck started today. After, I used the key fob and turn the alarm system on and left it alone for about 5 minutes. Is the security system shutting off the fuel injectors?What could make this happen?

Thank you for this post I had this problem and had to get a BCM cost me $340.00 all fixed.

My 01' GMC Sierra will not start occassionlly and I have not been able to pin point exactly when or what causes this to happen. Sometimes in the morning it won't start right away and when I drive somewhere and shut it off then try to start it again later it won't start. Sometimes I have to crank it over 5 or 6 times befor it will start. Then it run like a top, smooth good as new, It's not all the time its totally at random. I've changed the fuel filter, had the injectors cleaned, fuel pressure is good, (new fuel pump, and fuel pressure reg.). This seemed to begin with the cold weather, Any help or suggestions?

I have the same problem on my 2000 gmc z71 i replaced the throttle positioning sensor or tps andit seemed to help a little but not completely. if you find the problem please let me know. thanks

My 8.1L Gas engine sometimes will not turn over. To make it start, one time I moved shifter, one time I opened and closed driver door, one time I pushed truck 10 ft in driveway. Time between occurances one month. When trying to start, turning key does nothing. New battery, found no loose wires in system, head lights work, radio plays, interior lights work, dash lights work.

Could it be a loose connection wire, defective key switch, or a starter block in fuse box?

Thanks,

Tom

Took it to a professional mechanic, an he said it was the ignition coil. They replaced it. An told my husband to replace the spark plugs, wiring, an distributor cap. So he did that an it runs worse now. Like its misting an wants to die on us while going on road or sitting idle. Now they say its out of timimg, an my husband is trying to fix it himself cause we cant afford $1000. To get it fixed professionaly. Could you plz help us?

Truck starts sometimes then go somewhere and trk wont even make a click. Battery is fully charged, and no other reasons it not starting sometimes starts just fine last time this happended was about 3-4 months ago. The last time I disconnected battery for awhile and reconnected and it started right up. Now I disconected the bettery all night and still nothing please help.

Yes all lights are working, and rechecked battery cable it does have 2 wires going to it. They are tight and connected. Is there a seperate module or sylinoid to check?

I've had the truck for about two years now since 155k miles. It's been great except for having the transmission rebuilt, front bearing issue and new tires. I do continue to have a problem I need resolved. The truck does not start at times. It's not the battery charge or alternator as these have been tested. When it happens, it's just like you are trying to start the engine while in drive. All dash lights and chimes work but nothing happens when turning the key. I have taken it several times to a reputable Goodyear mechanic who could not duplicate the issue. I have been told by them and friends that it could be the built-in security system or possibly still the starter. Have you heard of this issue and what should I do? Thank you.

2001 GMC Sierra 4x4 mileage: 111,000. I was traveling on a bumpy dirt road, when my truck stalled. I tried to jump it but it wouldn't start. In troubleshooting, I have determined it is not getting fuel. It will start if I put a little gas in the carburetor. I suspect the auto fuel shutoff switch but can't locate it either in the manual or through tracing the fuel line. The reason I suspect this is that I have had trouble with the cutoff switch before on other vehicles.

Your vehicle is not equipped with a fuel shut off switch. If you do some checking, you will probably find the fuel pump has failed.