Question about 2000 GMC Yukon Denali

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2000 gmc yukon denali wont start i think because of the security

I already checked about everything because i have a scanner and checked reading with multimeter and i have fuel and spark but i noticed the security light would flash on and off when attemping to start. can i bypass the factory alarm.

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There is a detailed write-up here: http://newrockies.com/vatsbypass. That guy is great, this was the only way I was able to save my Park Avenue.

Posted on Apr 16, 2010

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SOURCE: 2000 gmc yukon denali wont start i think because of the security

you have a bad ignition switch but if you turn key on for ten minutes until the light stops flashing then turn off key then try to start this should reset the security system

Posted on Mar 19, 2009

6ya6ya
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Posted on Jan 02, 2017

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1 Answer

2000 GMC Yukon Denali will start And then shutoff immediately. Why?


My guess would be something electrical that is not working due to the temp. Like a relay.
A relay could loose magnetic power for a few tries then start working.
Or the engine temp sensor could be out of calib and telling the computer the temp is 90 degrees when it is only 50.
You could use a scanner to read the sensors and look for something not right.
Without knowing what is missing in the equation its going to be tough to diagnose it. You really need to know if you are loosing voltage to the coil or the injectors or if the fuel mixture is too lean, etc.

Sep 27, 2012 | 2000 GMC Yukon Denali

1 Answer

2000 GMC Yukon Denali just changed o2 sensor tps sensor pcv valve fuel filter and did an oil change. Now it wont start. Drove it 3 days before what's the problem


Good question. There are certain things an engine needs to start and run.
> air-fuel mixture
> volumetric efficiency
> compression
> ignition

Which of these things is your engine missing?

Nobody can tell you over the internet without first checking the vehicle out to determine which of these things are missing. Even if we knew which one, there are MANY things that can be the possible cause of each of these things to not be correct.

Plain and simple, the vehicle is going to have to get checked out.

Anybody who tries to tell you any different does not know anything about automotive diagnosis and repair.

May 04, 2012 | 2000 GMC Yukon Denali

2 Answers

I have a 2000 Yukon Denali and the alarm system will not alow it to start at times.....What should i do whwn this happens or how can i prevent this from happening


According to my lists, 2000 Yukon has a Passlock 2 anti theft security system. This means that the key literally has a transponder in it that sends a radio signal to the ignition. The ignition/lock cylinder then sends a signal to the TDM (theft deterrent module) which then reads the signal and allows your truck to start. If there are any communication breaks, the truck thinks its being stolen and goes into anti theft.... Read up on this link. There might be an option for you. http://vatspasslockpasskeysecurityhelp.yolasite.com/

May 05, 2011 | 2000 GMC Yukon Denali

2 Answers

2000 Yukon denali having trouble starting. Sounds flooded. After it sits awhile it will start. Replaced fuel pump. Still having problem. Security light is on. Replaced ignition switch. Please advise.


If it is flooding,fuel is not the problem.Sorry you did a pump already.You need to check spark and air,I would start with spark.Check your plugs for spark.If they all spark normal,that also means the ignition coil is good.That leaves air.Check the filter and intake hose for leaks,holes,etc.I would guess spark,but you never know what you'll find.If you are not 100% sure how to check spark,sounds like you probably do though,just comment on this post and I get an auto email linked to here and tell you the best method.Good luck! Greg

Aug 19, 2010 | 2002 GMC Yukon Denali

1 Answer

2000 gmc yukon denali wont start i think because of the security


you have a bad ignition switch but if you turn key on for ten minutes until the light stops flashing then turn off key then try to start this should reset the security system

Mar 19, 2009 | 2000 GMC Yukon Denali

1 Answer

2000 Gmc Yukon Denali wont start i changed fuel pump and filter


your getting too much air in chamber on igintion probly cause by a faulty intake and or a faulty tps (throttle positioning sensor) sounds like intake is sucking more air that fuel which is giving a bad air fuel mix in chamber also try checking your mass air could be faulty as well

Feb 10, 2009 | 2000 GMC Yukon Denali

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