Question about 2005 GMC Envoy

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2005 enjoy not transferring power to front wheels and spins the rear

When i am in a4wd or 4hi the power stays in the back tires and spins on snowy roads.

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If ingine light comes on /i would ckeck it out they check at auto store free an 05 /sounds like transfercase contol switch.get some mickys .oh i was thinking check out ur esof/or the msof/manual and electronic shift

Posted on Jan 25, 2013

  • bill krolczyk Jan 26, 2013

    i have seen some articles on the control switch. it mainly does this under A4WD. the 4HI doesn't slip as much.

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Posted on Jan 02, 2017

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dttech
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SOURCE: Recently got remote starter installed (not by

GM has had more that their fair share of transfer case problems. I have also seen may problems caused by addition of aftermarket equipment - especially remote starters. There is a good chance that you have a damaged transfer case, but if an electrical problem was the root cause of the damage, you will only destroy a new transfer case if the electrical problem is not resolved. If the mechanic that you are going to does not have the proper equipment and/or information to diagnose your transfer case control circuits, you should consider getting a second opinion from the dealer before buying a new transfer case. I currently work in an aftermarket shop. There are several of the GM 4 wheel drive systems where the manufacturer has not released the information necessary for an aftermarket shop to properly diagnose and repair the system. Some mechanics are simply to proud to say "I can't" or "I don't know".

Posted on Jan 22, 2011

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elshaddai159
  • 1016 Answers

SOURCE: 1999 GMC Sierra 4WD -

Hi,

The most common problem with this is the clutch packs in the transfer case, they sound like like are not locking up the front diffs properly and may need to be adjusted or replaced.

You need to do a pressure test of the fluid transfer section to ensure that there is the correct pressure to engage the clutch packs then if thats ok start to look at adjusting these.

Let me know if you need more infromation.

Thanks

Jason

Posted on Sep 01, 2010

  • 12650 Answers

SOURCE: 4wd hi is not working, the a4wd works. the 4hi

it is normal if u get tire spin in 4wheel or in all[a4wd]-- even auto[4wd] uses the rear spin to engage the front differential

Posted on Dec 22, 2009

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1 Answer

4 wheel drive won't engage


Which do you have ?
Transfer Case - NVG 236 (Two Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
Is the switch light on or flashing ? If you have automatic 4x4 there are several DTC'S that can set >
DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0362 4LO Discrete Output Circuit High DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error

Dec 01, 2015 | 2000 Chevrolet S-10

1 Answer

4wd will not engage in 4HI, 4LO or Auto 4WD


most of the engine power is designed to go to, the back wheels UNLESS the transfer case is in LOCK position in 4 hi or 4 low..also was the front hubs locked in...some models still use lockouts in front..remember this also.. if most of the weight is up front as it is on pickups, the rear wheels are the least resistance for the power so they will move first unless thers enough weight on top of them say sandbags or firewood or just dead weight...(if the truck is used look under the vehicle to see if the front driveshaft was taken out..some folks do this for fuel economy purposes) good luck repost findings please...thnx

Jan 19, 2013 | 1999 GMC Sierra

1 Answer

Where are the fuses for the 4x4 located on a 05 envoy


This not a fuse problem. When you switch to A4WD or 4HI, do the indicator light for those positions stay on solid or do they blink and then return to 2HI position? If so, then there is probably a problem with the transfer case actuator/motor.

Aug 10, 2012 | 2005 GMC Envoy

1 Answer

The service 4wd light came on in my 2002 envoy.


There are two motors under the vehicle. The front axle actuator moves ONLY during 2HI->A4WD and A4WD->2HI transitions. The transfer case encoder motor makes a lower pitched noise in every mode transition: 2HI->A4WD, A4WD->4HI, and 4HI->4LO, and the three transitions upwards.

If EITHER of the motors fails to do what the TCCM commands it to do, the switch light will flash and the Service 4WD light on the dash will come on.

If you're a DIY mechanic, you might look into them further, or just take it to a mechanic who knows our systems. The average mechanic is not going to know the theory of operation of the trailblazer/envoy 4x4 system, which is pretty unique in the industry

Mar 11, 2011 | GMC Envoy Cars & Trucks

2 Answers

Recently got remote starter installed (not by dealer). Shortly after, light on 2WD kept switching to A4WD. When dial switched to try to get vehicle back in 2WD, light would stay for a few minutes but then...


GM has had more that their fair share of transfer case problems. I have also seen may problems caused by addition of aftermarket equipment - especially remote starters. There is a good chance that you have a damaged transfer case, but if an electrical problem was the root cause of the damage, you will only destroy a new transfer case if the electrical problem is not resolved. If the mechanic that you are going to does not have the proper equipment and/or information to diagnose your transfer case control circuits, you should consider getting a second opinion from the dealer before buying a new transfer case. I currently work in an aftermarket shop. There are several of the GM 4 wheel drive systems where the manufacturer has not released the information necessary for an aftermarket shop to properly diagnose and repair the system. Some mechanics are simply to proud to say "I can't" or "I don't know".

Jan 22, 2011 | 2002 GMC Envoy

1 Answer

How do I know if my 2004 Rav4 has 4 wheel drive


check under the front and rear see if it has a transfer case with a drive line going to the front and rear. If there is no 4/4 button it would be full time 4 wheel drive. you can also check by jacking up the front and rear to see if the tires spin, If it was snowy out someone can stand outside the car and see if tires are spinning.

Feb 16, 2010 | 2004 Toyota RAV4

1 Answer

While set in A4WD the indicator will start


ask another GM dealer, have them check for related TSB's. could be the front acuator.

Jan 02, 2010 | 2005 Chevrolet TrailBlazer

1 Answer

My 2002 2500HD 4x4 front axle not engaging


Try jacking up one side of the front and putting it on a jackstand. Then turn key on(but dont start it) and put it in 4hi. Try to spin the tire in the air. The drive shaft should not turn nor the wheel. If the wheel does then maybe the acuator is not moving in the axle. It worked when you pulled it out but it might be hanging up on something in the axle.

Dec 31, 2009 | 2002 Chevrolet Silverado 2500HD

1 Answer

4wd hi is not working, the a4wd works. the 4hi sounds like it is kicking in but the back tires spin


it is normal if u get tire spin in 4wheel or in all[a4wd]-- even auto[4wd] uses the rear spin to engage the front differential

Dec 22, 2009 | 2004 GMC Envoy

1 Answer

4 lo working, 4 hi stopped working , A4WD never worked


Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer

Mar 30, 2009 | 2002 Chevrolet TrailBlazer

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