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The four wheel drive on my 2006 GMC Envoy will not engage

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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blueextc3221
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SOURCE: four wheel drive wont engage

If you have push button 4-Wheel Drive, it is recommended that you use it every once in a while, in order to keep gunk, rust, and corrosion to build up on moving parts. The mostly likeley (though not definite) reason would be that you let the 4-wheel drive unused for so long that corrosion has built up on the parts and the actuator that engages the 4-Wheel Drive doesn't have the power to engage it past the corrosion. You'll need to take it in to be cleaned, or to have parts replaced. In the future, every month or so, engage 4-Wheel Drive and drive around in some mud, grass, sand, or any other loose ground for a bit, just to keep the parts moving and clean.

The service Four wheel drive light is to alert the operator the system is not being read properly by the ECU.

If the ECU loses contact with or position of the Transfer case actuator motor the service light will come on. Same thing goes for the front diff actuator.

So it may be a bad switch, sensor, or an actual problem in the 4WD linkage. This is not a Oil Change light that you can ignore a few extra weeks - it indicates a problem that should be taken care of ASAP to avoid costlier problems down the road.
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Posted on Feb 21, 2009

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  • 5 Answers

SOURCE: 1999 jeep grand cherokee all time four wheel drive will not engage

Sounds like the splines on your transfer case gear are ground down

Posted on Apr 23, 2009

  • 118 Answers

SOURCE: wont shift back from 4x4 low, to 2x2

put the truck shifter from park to neutral then shift 4x4 button into 2whl Or Auto which ever you prefer. note when always shifting into low 4x4 or out the transmission MUST BE in neutral

Posted on Sep 07, 2009

csmock132
  • 4669 Answers

SOURCE: four wheel drive doesnt engage

Sounds like you have a bad switch.

Posted on Apr 21, 2010

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  • 432 Answers

SOURCE: how to fix four wheel drive on a gmc serria 1500

Good Evening. So from the sounds of it you say the hubs are not engaging, which means you probably checked the driveshaft and saw it moving. There is a actuator on the right hand side of your front differential and has plug in with 2 wires going to it. First off take a test light and hook it between the wires start the truck and be sure it is in 4wd and if the light turns on you need to replace the actuator which is a common replacement item. We only use the 88 and newer chevrolet trucks for our snow plows so I have seen this too many times. If there is no power there is a fuse in the fuse panel then take your test light and check them as well. I hope this helps you.

Posted on Aug 11, 2010

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your actuator for the transfer case is probably malfunctioning. check to see if it makes any noice when you press the four wheel drive button. if not check current flow with a voltage meter. if no voltage is present check wiring and connections from the actualtor back. always check fuses and relays first.

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CHECK FOR THE MOBIL OIL AND radiator colling system are they jamed give a clean service and check for the oil filter , if the heat is controlled then tune your engine to the local machanic or service center
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