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Author Topic: auto 4 wheel drive turning itself ON  (Read 163 times)

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supermanotorious

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auto 4 wheel drive turning itself ON
« on: January 23, 2019, 15:20:24 PM »

I've noticed over the last several months on occasion I am in 4WD and I did not request it. So I noticed when I start the truck sometimes, it goes from 2WD to "auto" all by itself. Is anyone familiar with this issue?
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2003 8.1L Avalanche 2500 4X4
2003 Harley Davdson FXDX
1994 Four Winns Freedom
2008 Skyline Freestyle (toy hauler)
www.phoenixwinch.com

MS03 2500

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Re: auto 4 wheel drive turning itself ON
« Reply #1 on: January 24, 2019, 11:44:28 AM »

Many many years ago mine did the same thing while it was still under warranty.

I would notice it was in the wrong setting even indicated it was in neutral sometimes, I took at back to the dealer and they reprogrammed it.

That lasted for a few weeks until it actually dropped from Auto to 4LO by itself while I was driving, I just heard a thump and almost kissed the windshield.

Good thing I was driving slow because there was about 3 inches of snow on the ground. The writeup guy said there was a bad seal on the transfer case encoder motor, but the bill said they replaced the transfer case encoder motor and they replaced the TCCM (Transfer Case Control Module)

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2003 2500

ca2kjet

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Re: auto 4 wheel drive turning itself ON
« Reply #2 on: January 24, 2019, 19:45:10 PM »

I'm willing to bet it's just a failed encoder motor. The solenoid eventually wears out, usually due to environmental factors, and the sensor no longer knows what position it's actually in.
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Black on Black - 2007 Avalanche 4x4 LT3 Z71

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Re: auto 4 wheel drive turning itself ON
« Reply #3 on: January 24, 2019, 21:29:31 PM »

I will agree with you, but it was still under warranty so they never did tell me for sure what exactly what it was.
Just threw parts at it.
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2003 2500
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