Hello fellow Colorado friends. I’ve been lurking on the site for many years and have gained valuable information from all of you. I’m guessing the service is because I’m coming up on 60,000 miles and Chevy wants to make a little bit of money off me. Any thoughts?
Service 4wheel drive at 59,600 miles
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From what I have read along the way that comes on when there's an issue with the motor that controls the transfer case. Does the truck actually go into 4WD? You could try putting the the truck in and out of 4WD a few times and see if it clears up. It's an out of sync type of thing where it doesn't really know if it's in or out of 4WD. The feedback signal doesn't line up with the dial selector in the cab.
Let us know what you figure out...
Thank you, I’ll play around with it and get back to you
It worked! The first time I tried to turn the knob to 4wheel it wouldn’t make the change. The same with 4wheel low. The second and third time it worked perfectly. Knock on wood, the warning has not happened since.
Thanks for your advice!
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Cool, glad I could help.... thanks for the follow up.
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This has happened to me twice, with 4lo. Both times when I wanted to crawl up on my racks to change oil. So, cold engine/trans, and later it worked. I would much prefer the manual stick on my '95 "light" K2500, X cab, with 3.73's and trailer tow pack. 23 years, and it always worked.
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I hope that the cause of everyone's 4lo problems is from serial carelessness. Mine were. The dialed shift positions are easily found by GENTLY turning the knob. I.e., when you jam it clockwise to the stop, you pass by the 4lo position. So, no 4lo, and you do it again, and again..... Lightning finally struck me in the drivers seat yesterday afternoon. I moved the trans case thru it's different positions 3 times, uneventfully.
I really need to work on my ready, fire, aim, approach to life's processes.
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The only time I turn the switch fairly quickly is when going to Neutral on the transfer case. I have learned through experience that allowing the switch to pause in any of the positions before Neutral will preclude the shift to Neutral. I have to go through this multiple times/month when I tow the truck 4-down behind the Coach.
Otherwise, bigoilbob's advice seems very on point regarding shifts to positions before Neutral.
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More good info. I'll try and remember that.
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