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Jerry
Jerry, Master Mechanic
Category: GMC
Satisfied Customers: 17218
Experience:  ASE Master, 30+ years exp. former shop owner/ manager
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I have a 2004 GMC Yukon. Upon start up, the 4WD indicator is

Customer Question

i have a 2004 GMC Yukon. Upon start up, the 4WD indicator is a complete mystery as to what it will start up in. What is causing this?
Submitted: 2 years ago.
Category: GMC
Expert:  Jerry replied 2 years ago.
Hello. My name is ***** ***** you for using the site, I will be happy to assist you today.
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There has been a factory service bulletin, (not a recall) for that type of concern. It involves a software update for the vehicle’s computer and has to be done by a dealer, I hate to have to say.
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Here is a link to what it states.
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https://www.dropbox.com/s/agsq7yb3hpzu5yw/TCCM%20program.pdf?dl=0
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Please don’t forget to rate the answer, **** THAT IS THE ONLY WAY I GET PAID **** if you need any more on it, I will be here.
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Thanks

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