Question about 2002 GMC Yukon Denali

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My service engine soon light came on what is connected to it what would be a list of possible service its a 2001 youkon denali????

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There are over 100 sensors that can cause the check engine lamp to come on , retreiving the codes from the computer will be required to determine which part of the system the failure is in.

Posted on May 31, 2010

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Posted on Jan 02, 2017

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Reset service light 2001 yukon


the answers above do not work. batter cable off does not work. that turn on 5 pedal thing is BS. also some a holes online are saying undo the fuse cover under the steering wheel and and unplug the ECU - well the fuse panel is not under the wheel, it's on the drv side of the dash. AND even when you pull that there is nothing called a ecu. funny hu. there is not a ECU fuse in the under hood fuse box either. service engine soon light is STILL ON. It was flicked on from the air breather intake being loose. that has been fixed. gas caps on tight. engine oils been changed.

Mar 18, 2012 | 2001 GMC Yukon Denali

1 Answer

How do i resest service engine soon light on a 1999 Denali, it has stayed on for 2 days, but all the gages are fine and all fluids are full.


The service engine soon light can be reset using an OBD-II Scanner's Erase Code function (button).

I got one for $98 plus tax at Walmart that has this function and should work on your vehicle.

Otherwise, the code may erase after 40 or more cycles of starting and shutting off the car's ignition, if there isn't something causing it go on consistently.

I would read the codes stored in the computer to see if it's something simple to repair.

Good luck on clearing your codes.

Jul 16, 2010 | 1999 GMC Denali

1 Answer

Replace front round shaped daytime driving light on the right front of my 2006 denali GMC XT Youkon


There are two pins on the righ and left side of each Headlight. Turn the pins forward then pull all the way up and out. The Headlight should easily come out. You now will have complete access to your daytime running light bulb socket. Twist out and replace bulb. To replace assembly simply go in reverse order keeping in mind that the holes need to be lined up when inserting pins.
Thank you for using fixya and be safe.

Apr 18, 2010 | 2006 GMC Yukon Xl Denali

1 Answer

1999 denali-5.7- looses power and starts to shimmy...then shifts down and struggles to stay at speed...service engine soon light begins to flash and eventually comes on solid. This happens intermittently...


flashing check engine light is a sever engine misfire that will cause a catalytic convertor failure which is about a $1500 repair in your denali. Have someone scan the code for you and let us know the codes stores in the computer are. Could be as simple as a tune up to fix the problem or bad as a fuel pump

Feb 25, 2010 | 1999 GMC Denali

1 Answer

Service engine light staying on


Hello tdamm...No...the service engine soon (SES) light on your yukon is not telling you to change the oil.
This is a warning light that is illuminated when there is a problem affecting the Emission system and the engines computer management (ECM) has detected it from a fault. It could be something as simple as a loose or defective gas cap. If the SES light is blinking, it's more serious....
The yukon needs to be connected to diagnostic equipment (scanner) for fault diagnosis.
You can go to autozone they will hook up an OBD II scanner to your vehicle and explain the codes to you.
Good luck...i hope this helps and will fixya up.

May 25, 2009 | 1999 GMC Yukon Denali

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