Question about GMC K2500

1 Answer

1998 gmc k2500 wont start

Will turn over but wont stay running

Posted by on

  • brody black Feb 15, 2012

    the security light also flashes. also just changed the motor

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 2,185 Answers

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) The TDM is what tells your computer that the correct key is being used and that it is "OK" to allow the vehicle to start and run. These 3 parts must be in CONSTANT communication. If the key is in the ignition, then these parts are sending important signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, (normally due to a failing/broken part) the car goes into antitheft mode. The car misinterperates this and thinks its being stolen or hotwired because it is NOT getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle. So basically, if that light is on, your system has some sort of failing part. This can start as an intermittent "no start", to your vehicle not running for days at a time, to the vehicle NEVER starting again. The problem is electrical and computer based, so don't count on an easy reset button, or the problem fixing itself. The hard part is isolating which part is the problem. You can spend a thousand dollars through a mechanic very easily. I have had great luck with bypassing the entire system. This way the problem will never return. It actually CAN'T ever return because it is eliminated. This can also be done yourself at a much cheaper cost. Read through this link very carefully. You'll find alot of information and pictures, along with ways to help you fix this.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Feb 15, 2012

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad
  • 375 Answers

SOURCE: adjust timing on 1998 GMC K2500 pick up 5.7 liter

It has to be done with a scanner. You can adjust this distributor, but there are no timing marks to watch as you move it. There is a timing mark on the balancer and on the timing cover for referencing Top Dead Center #1 cylinder only, but it is only used for dropping the distributor in to get the engine up and running. A scanner is needed to properly adjust the timing. Connect the scanner and look for a data parameter labeled ‘cam offset’ or possibly ‘cam ******.’ It will be listed in degrees. Start the engine, and bring it up to 1500 rpm. Note the reading. If the timing specification is not within plus or minus two degrees of zero, you need to move the distributor. You can move the distributor with the engine running but the timing will not change. After you move the distributor, the ignition has to be cycled off to let the computer learn the new timing spec. Restart the engine, bring it up to 1500 rpm and see what the new spec is. You must repeat this procedure until you get the timing into the specification as mentioned above. Once you have it set to spec, the code should clear.

Posted on May 18, 2008

  • 11 Answers

SOURCE: starts wont stay running

without seeing it here is my best answere, do you have the ability to pull codes if the cam and crank sensors are functioning properly ( no codes for them) i would then check the fuel pump fuse and relay . do you have fuel getting to the fuel rail . if u have a guage to check pressure at the fuel rail it should be above 30lbs , if you have no pressure and your fuses and relays are good then you have a pump problem provided you have not been in an accident , i believe that vehicle has a safety shutoff that might be located in the trunk .

Posted on Dec 09, 2008

  • 4 Answers

SOURCE: 1998 gmc k2500 4wd wont engage and light flashs on

replace ur 4 by 4 auxuator

Posted on Feb 21, 2009

  • 4 Answers

SOURCE: 4x4 wont engage

i would check to see if power is going to the 4 wheel drive aculator. if there is power then your aculator is bad. it is located at the front diff.

Posted on Feb 24, 2009

  • 41 Answers

SOURCE: 1998 gmc sierra k2500 wont stay running

you'll need a professional computer to reset how ever there are two relays for fuel on chevrolet
i would suggest finding the second one first

Posted on Dec 14, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

1994 k2500 4x4 wont shift in to 3 and overdrive


This year of GM Transmission doesn't have a vacuum modulator, it is all electronically controlled. And yes a shift solenoid can cause this but that should turn the check engine light on and set a fault code.

Mar 13, 2014 | 1998 GMC Sierra

1 Answer

1998 gmc hard to start


Is the base fuel pressure the same hot when it is cold, and so is the spark weak when the engine is hot ?

Jun 05, 2013 | 1998 GMC Sierra

1 Answer

98 gmc savana 350 v8 was running then sputtered would not go turned off now wont start i checked and replaced fuel filter still no luck it will start with starting fluid but wont stay running


sounds like a fuel problem. could be a fuel shut off switch, fuel pump relay, fuel pump. Possible bad electrical plug connection to pump

Apr 04, 2011 | 1998 GMC Savana

1 Answer

1992 K2500 gmc brake lights wont work


try looking on the fuse box, see if it is still okey, then replace if neccessary

Mar 23, 2010 | 1993 GMC Sierra K2500

1 Answer

1998 gmc sierra k2500 wont stay running


you'll need a professional computer to reset how ever there are two relays for fuel on chevrolet
i would suggest finding the second one first

Dec 14, 2009 | 1998 GMC Sierra

1 Answer

I have a 1996 GMC K2500 power staying on to my heater fan


Hardly seems worth changing the lock cylinder, since it is not that easy.
Just be more careful turning the ignition off.
Put in an ignition indicator light on the dash if you have to.

Jul 26, 2009 | 1997 GMC Sierra K2500

1 Answer

Ignition won't stay in running position.


You are gonna need a New Ignition. Will solve this Problem.

Jan 04, 2009 | 1998 GMC Sierra

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

190 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76051 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...