Truck starts and runs for a second or two then dies

I believe it has something to do with your spark plug, you should also check all the wires going to your battery to make sure there isn't a split,burnt, or a short in your wires. But first replace the spark plug the check your wires. I wish you the best of luck.

Did you get it fixed?I have same exact problem

I beleave its sicurity issue in top of colum on key cyl too wires come out thay are know for wiggling wires put wooden tooth pic in conector wire end and that should secure it and it shold start bang on collum while trying to start and it most likly will then do this tooth pic deal

Something grounded out and prob shorted a inline fuse so when you turn the key to run you hear your fuel pump Prime the line but when you crank the motor starts then dies. It has to do with your gin. Or ecu. Pcm not telling the pump to fun. Find where it loses that run signal and problem fixed

I had same problem..just fixed it..check under the hood fuse panal on drivers side..tcb fuse was corroded..replaced the fuse and started right up

We are having the same problem with it the security light stays on all the time when I try to start it and it was running fine until I changed the distributor And now doing this need help

We are having the same problem . It was running before we changed the distributor now it will start for 3 seconds the die and can’t figure it out need some help

Bcm is bad or first try reset ur security system

Engine starts right up then dies. It happened last year as well. Although I tried to start it multiple times over a couple weeks I gave it one last try after I called the tow truck. It started right up and engine stayed running like it was supposed to. No more problems for almost a year until about a week ago. I did nothin to fix it a year ago. I'm still trying to start it periodically like a year ago. Hopefully I'll eventually get it to stay running so I wont need to pay for a tow.

Gladeeric, same thing here. Tried resetting security, tried recharging the battery, just seems to have a mind of its own sometimes, don’t know what to do

My 2004 Silverado won’t start when it’s rainy so I sprayed the heck outta the wires and cap with wd40 it started right up ran till it rained 2 weeks later now just starts I can hear the fuel pump running but it dies after about 40 secs dies then will not start till it sits for about ab hour any suggestions

Ok SOLUTION ...... these trucks are notorious for the security locking out even the owner with the proper key. You can reset the passlock system (takes about 30 or 40 mins) this will usually fix the problem however it will usually do it to you again at the absolute worst possible times. You can bypass the security system completely and never worry about the problem again. You will not have a security system in your vehicle once it is bypassed. To reset the pass lock system Make sure your battery is fully charged as your key will be on for 30 to 45 minutes while you are resetting the passlock system. Start your vehicle and let it die once it dies your security light will start flashing leave your key in the on position The security light will flash for roughly 10 minutes and then will either stay illuminated or will go off once it stays illuminated or goes off turn your key off for 15 seconds then start your truck again and let it die repeat this process three times and on the third time the vehicle should start and stay running if it does not on the third time do it again sometimes it takes four times sometimes only three. If you would like to bypass the pass lock security system also known as the VATS system you will perform this exact same procedure The only difference is you will need to take the plastic cover off of your steering column top and bottom. Right above your key you will see three wires the one to the far right will be red the middle one and the far left one are normally yellow and orange however the colors do vary sometimes do not mess with the red wire but cut the yellow and orange wire. Tie the yellow and orange wire together on one side of where you cut as well as tie the yellow and orange wire together on the opposite side of where you cut so both sides should be tied together heat shrink or wire nut the wires together then perform the procedure to reset your pass lock once your truck starts and stays running after 3 or 4 times of doing it your security system has been disabled and you should never have to worry about that again. I hope this helps I am a long time mechanic and even this one stumped me until I finally figured it out. Best of luck and if there are any questions feel free to reach out

Rhett2018 my security light flashes 4 or 5 times then goes off do I still need to wait the 30 minutes or so I go ahead and repeat the steps

I have the same issue and have tried the reset 3x thing 3 different times and still nothing. Very very frustrating!

I have an 00 Sierra. I have done the reset 5x. My security light and battery light stays on they just take turns battery, security, battery , security. My truck starts and dies.

The positive battery cable is bad. The pigtail wire that feeds constant current to your ECM is corroded in the battery connection, put a new connector on that wire, or replace the cable. You can test it by bypassing the terminal connection with a jumper wire from the battery post to the ECM wire. Unplug it from the harness and feed 12V directly into it. If it starts this is your problem. I'vee had many different types of vehicles with this same problem.

Any body figure it out. My 7.4 is doing the same

My 5.7 1996 is doing the same exact thing. Anyone find out the problem?

Yes @guru334ct, @rhett2018S response from 4 months ago worked perfectly for me. It’s an acreage truck so I don’t mind if the security light is on.

I am having the same problem it started then died and won't start. The fuel pump is working I replaced the battery. But the whole dash cluster went out and the security light stays on. I've watched the battery drain should I replace spark plugs? It hasn't had a tune up in a while and is running over 200,000 miles. It trys to start but won't turn over. When I have explained my problem to people most have said it could be the BCM

Mine did the same thing. start and stop start and stop within just a few seconds.I pounded on the top of the column in the middle adjacent to the key switch as I tried to start it and started right up and stayed running. so wires must be loose. I'll take care of it in the morning.

I have a 99 c2500 and it starts for a second then dies, I just finished rewiring the entire dash

I've had the same starts run for a few seconds and dies,replaced fuel pump,pump relay,fuel filter,ignition module.still did the same thing.final put the air box back on and it runs.so the mas airflow sensor has to have air going over it.

2005 Tahoe starts but dies straight away. PLEASE DONT SINK MONEY INTO TAHOE. If the problem isn't your body control module , fuel pump, injectors, nor ignition switch. Flip over engine compartment fuse block carefully and check for bright green coloring around wire port. If any color is present use an 8mm or 10mm socket and loosen the bolt holding the wire connectors on the bottom of fuse block. Carefully unplug connectors and notice acid corrosion. Clean with electronic cleaner sold at any auto parts store and spray generously until copper/silver color indicates clean and spray clean the fuse block connectors and inspect wire connectors wire port for black , melting or charring. If any present replace the damaged terminals. To diagnose bad fuse block terminal use a test light. Hook - side of test light to ground. Turn on ignition don't start. Test each fuse pole every fuse pole side will light . If one pole of fuse lights test light then replace fuse of both poles of fuse does not light it indicates a broken wire, corroded connection, or damaged fuse block connectors.

Problem with every car is battery acid sloshing out of vents on top or side of battery. Rain dilutes the acid to electrolytic fluid and shorts batteries and the vapors cling to anything metal. The engine compartment fuse block on Tahoe sits behind battery and subject to corrosion. The bottom of fuse block in engine compartment connectors not sealed from rain or any other fluid and subject to corrosion. Symptoms of failure to start, security light on or flashing, fuel pump quits, injectors won't pulse and even cause constant dead battery. If there is no power to those systems they will diagnose bad unless bench tested. How I do it. Refer to previous post. ∆

In my Tahoe case of start then dies I had two wires corroded on cooling fans relay block and on ECM, PCM and BCM fuse line in engine fuse block. now starts and doesn't overheat now. The fan relay block sits behind engine fuse block accessable by removing the whole cover not just lid.

My 2000 gmc Sierra slt start up then die I change the crankshaft sensor and the fuel filter and the fuel pump it still doing the something can somebody help me out

Pull and reinstall every fuse in the under the hood fuse box....Fixed my 06 silverado.

2000 GMC 2500. Cold start and drive with no problems. Stop and run in to pickup grocery or whatever. I go to start and will take 4-5 or so cranks to get her going. Have had her into GM service and private repair shops and they cannot figure it out. HMMM

Mine was just a spark plug wire needed wiggling on the boot going to the plug it came back a few weeks later so I gave them all the wiggle it now still no issues think I'm going to add some electrical grease next time I do the plugs and wires or next time it does it again

I have an 02 Chevy Silverado 4.3 L V6 and mine was doing the same thing as the others in this thread but for me it was the battery cells leaking into the battery pan and onto the PCM once I took it all apart and cleaned it repaired any corrosion and covered the pan with Flex Seal as well as the part of the PCM that had been contacted with corrosion put it back together and my truck immediately had all the power back my lights were brighter inside and outside dash lights were bright and even the radio was picking stations up better hope this helps

i change torque converter in my 201 silverado 6.2 6 speed now my truck starts and quits and starts and quits

2011

I just had the same issue as Mattschevy. No headlights, dome lights, would start briefly but then die. Also noticed I couldn't unlock driver side door with key fob or button inside. Turned out to be TCB fuse at very bottom right corner of fuse box under hood.

Unplugging the negative battery lead and turning on headlights for 5-10 minutes resetting the controller worked perfect for me this morning on 2007 2500HD Chevy. Thanks so much!