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Another (OT) question. '99 chevey silverado

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Oliver Power

07-14-2007 08:40:38

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The measage center reads "Service 4 wheel drive". Everything seems to work OK. Any ideas? Thanks

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07-14-2007 12:38:53

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Re: Another (OT) question. '99 chevey silverado in reply to Oliver Power, 07-14-2007 08:40:38

The button panel has a high rate or replacement on those trucks. I had the same issue with my 01. New panel and the problem went away. Had a buddy that worked at the dealership and said 75% of the problems are with the button panel on the dash.

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bradk

07-14-2007 10:12:57

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Re: Another (OT) question. '99 chevey silverado in reply to Oliver Power, 07-14-2007 08:40:38

Does it have "auto 4x4"? There have been issues with the auto 4x4 transfer cases.

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oliver power

07-14-2007 11:10:04

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Re: Another (OT) question. '99 chevey silverado in reply to bradk, 07-14-2007 10:12:57

Yes , it does have the buttom for the auto 4 X 4. I have never pushed that button. I do like the sounds of that push button modual replacement idea. That sounds like a simple fix to me. Sometimes when I go to switch from 4 wheel drive and back , I may have to do it 2 or three times before it changes. Still open to other opinions.

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Bob

07-14-2007 11:12:17

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Re: Another (OT) question. '99 chevey silverado in reply to oliver power, 07-14-2007 11:10:04

Before throwing money at it, get it "scanned". The 'puter will tell what's bothering it with a specific trouble code.

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Bob

07-14-2007 11:25:38

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Actuator failure in reply to Bob, 07-14-2007 11:12:17

P.S....

What you are describing sounds more like a shift actuator unit failing. That is common. There is a motor in there, and a wiper switch that tells the 'puter that the motor has actually completed the commonded shift. If it doesn't shift, or takes too long, the 'puter turns on the warning light.

The shift buttons actually don't switch any current, just send commands to the 'puter that does the actual shifting. NOT to say the buttons can't fail, but it's not like they are actually carrying the current for the shift motor.

Replacement transfer case shift actuators are in the $125.00 to $250.00 range, depending upon rebuilt or new.

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Matt Weltz

07-14-2007 10:08:24

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Re: Another (OT) question. '99 chevey silverado in reply to Oliver Power, 07-14-2007 08:40:38

Both my brother and I had the same problem on our 99's (one chevy, one GMC). The push button module for the four wheel drive will need to be replaced. I think when I did it a few months ago it was like $30.

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bradhowNE

07-14-2007 09:06:56

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Re: Another (OT) question. '99 chevey silverado in reply to Oliver Power, 07-14-2007 08:40:38

Mine has been doing that almost ayear now would like to hear any info

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Bob

07-14-2007 08:52:09

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Re: Another (OT) question. '99 chevey silverado in reply to Oliver Power, 07-14-2007 08:40:38

The engagement of the 4X4 system is even under 'puter conrol.

It looks at ABS (wheel speed) information, etc., before commanding the shift motor to engage.

You need to pull the trouble code(s) and see what the computer is "seeing" that it doesn't like... missing sensor information, or problems with the switch in the motor that tells the 'puter where it's at, for example.

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