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First thing I would try would be disconnecting the battery for 5 minutes to see if that clears the code...

I just sold my 99 Yukon to a friend last week....

UPDATE: My Yukon now has 330,000 and still running strong.

No, this engine has 119,xxx.

My 99 Yukon has 303,475. :thumbsup:

Have you checked to make sure the parking brake is not partially engaged? All it takes is one down click to disable the daytime running lights.

There are supposed to be plastic caps on the bleeder valve. They are sometimes discarded by unprofessional mechanics. Without the added protection, I have seen them get gummed up. A small stiff piece of wire, or a scratch awl inserted into the valve can clean them up enough to work...

Most dealerships only charge 40 bucks for a diagnostic. Money well spent in cases like yours.

I had this problem a while back. I would bet it is your catalitic converters, O2 sensors, or a combination of the two. Drive it at night getting it up to operating temps. Stop and get out and look at the converters. If they are glowing red, they are restrictive causing the 02 sensors to...

Remove the cover on the vents for the foot area, stick your hand in it and you will feel the diverter door. See if it moves when you change the controls. I have seen these break off the little tabs that hold them in. The part is not expensive, but the whole dash needs to be removed to replace...

Got any pics of the culprit?

Have you disconnected the battery for 5 minutes or so? If your O2 sensors are bad they will keep throwing a code.

Good luck. I have searched, and searched. No such animal. Helper springs were all I could find.:confused:

Check the front end and make sure everything is tight. Worn ball joints, pitman arm, and idler arms can cause vibrations.

If the U-joints seem tight, the ring and pinion gears could be worn causing this noise. Hope this helps.

My yukon has 297000 miles on it. Wash it regularly. Regular maintenance is key.

Great post!:thumbsup:

Hey, I can't be wrong all the time! I did not think this was a common problem. I am glad I could help.

I had a similar problem. Come to find out it was the passenger side vanity mirror light not shutting off.

Your best bet is to call a local junkyard. Most of them have a cross reference program. Hope this helps.