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Transmission jerks when in auto 4-wheel mode

2006 Envoy - when transmission is in auto mode it jerks, it's like it is switching in and out of 4-wheel drive when you excelerate and when you are slowing down.

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  • Anonymous Dec 28, 2008

    I have a similiar problem. Have you changed a tire or are they all the same pressure. They tell me they all need to be the same size and brand of tires and properly inflated

  • Anonymous Jan 06, 2009

    2008 does the same thing. Dealer explained that this is normal giving there is a little play in the front differential due to 4X$ configuration. Don't think I buy it though???

  • lynniegirlie Feb 16, 2009

    my 2007 is at the dealer right now because of the rough shifting. since the 4 wheel drive button is at my cup holder, it changed to "auto 4wd" without me knowing. dealer said it's a common problem.

    does it damage the engine to have the car in auto 4WD all the time? shouldnt it only come on when it's needed??

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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mattman2112
  • 57 Answers

SOURCE: Ford explorer stuck in low 4wheel drive

put it back into 2 wheel drive, then reverse 10 or 15 feet, this should unlock the hubs.

Posted on Jan 10, 2009

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dealt_soul
  • 296 Answers

SOURCE: my 2004 lincoln aviator is jerking when I excelerate.

First go to the part store and have them check for codes on the computer. Check spark plug and wires. Hook up a timing light to each spark plug wire and see if the light skips. If so then change coil packs.

Posted on Jan 18, 2009

  • 1 Answer

SOURCE: engine whinning

I had the same problem on my 2005 Envoy. Turned out to be the idler pulley bearing. It is just a pulley the belt rides on. The bearing in the pulley was what was making the high pitched whine. I replaced the bearing, and the noise went away.

Posted on Mar 07, 2009

  • 1 Answer

SOURCE: 2001 Dodge Durango stuck in 4 wheel-Low. Won't switch back to 2WD

Just to clarify, the "transmission" is not stuck in 4-Lo. It is the "transfer case" that is attached to the transmission that actually engages the 4-Hi and 4-Lo modes. To properly shift your vehicle into 4-Lo, you know that you have to shift the transmission into neutral and slow down to less than 5 mph. Once your vehicle slows down to this range, your can switch your transfer case into 4-Lo mode. Due to the inner workings of the transfer case, the actual shift into 4-Lo may take a few seconds to complete. This is normal and does not signify that there is an issue. All transfer cases that have 4-Lo mode will act this way regardless of the make or model. To make a long story short, to shift out of 4-Lo you must follow the same steps that you took to shift into 4-Lo, just in reverse order. Switch the transfer case to 4-Lo mode if it isn't already there. Slow down to less than 5 mph (your vehicle must be moving, though). Then, shift your car into 4-Hi or 2WD. Give your vehicle several seconds to complete the shift. The transfer case indicator light will flash until it is complete. When it does complete the shift into the new gear mode, you will most likely hear a "clunk" (the range sleeve inside the transfer case disengages from its mating spline) from under your car. Again, any transfer case with 4-Lo (regardless of make or model) will exhibit this same noise. This should help you get out of 4-Lo. It is good practice to shift your car into and out of 4-Lo at least a few times each year to keep all of the splines free of corrosion and build-up. Based on the age of your vehicle, your transfer case may also need a complete flush and some new transmission fluid. Hope this helps.

Posted on Mar 21, 2009

SOURCE: When in auto hubs the 4 wheel drive doesn't work

They are operated by vacuum. Check to make sure the vacuum lines are connected and not ripped or anything. If that checks out fine, remove the vacuum line from the hub and apply vacuum to the hub, if the hubs lock then the problem is in the vacuum line or switch.

Posted on May 09, 2009

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What cause my 2006 gmc envoy danai to go in an out of limp mode


you need to hook up an obd2 scanner to the port under the steering wheel and see what your computer says which sensor or circuit is acting up

free service at my local autozone or advance auto parts stores

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My 99 expedition won't stay out of all wheel drive I changed the transfer case motor and now it stays I awd for about 10 minute then kicks back out and then the 4x4 light flashes and then it is ok until...


The 4X4 system on your vehicle is computer controlled , GEM module . generic electronic module . The four wheel drive mode switch is a low voltage input to the GEM module . The GEM energizes relay's to control the mode as depicted by input from the mode switch an torque on demand relay an someother inputs . Probably has DTC - diagnostic trouble codes stored in the GEM module .
Transfer Case -Automatic Four-Wheel Drive (A4WD) The automatic 4-wheel drive transfer case system consists of the following:
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  • brake pedal position (BPP) switch
  • torque on demand (TOD) relay
  • front output shaft speed sensor
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1 Answer

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When was the last time the transfer case fluid change, it is recommended that it be changed every 50K miles. It is possible that you have transfer case issues. It is not recommended to operate the drive system in Auto mode constantly, this will wear out the internal clutches.
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Need to shut auto light mode off for my headlights


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Envoy 2002 2008 Workshop Service repair manual
My personal suggestion would be to go for these repair catalogs. I know this website reliable-store that i used to buy them from, and they sold online it was very good manual. Go ahead, I bet.

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