Question about 2002 GMC Envoy

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My Envoy will not stay in two-wheel drive mode (it shifts to neutral while I'm driving). When I use AWD, it rides very rough, particularly during tight turns. cjccbay1@msn.com

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Check tires are matching and air level correct but sounds like problem in drive train possible problem with a bad front c-v joint/ trans-axle or fault with actuator at trans check wiring and actuator mounting

Posted on May 06, 2010

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1 Answer

Why don't my front tires turn qhen in 4wheel drive


Clicking is a problem. Do you use 4WD often? My rule of thumb is every month put in 4WD and drive for 10-20 miles. Keeps pumps working and lubes internal parts. Sorry, but have always had problems with GM 4WD. Try this in neutral or park turn switch to 4 wheel, wait for the light tho go off or noise to stop. Do the same in AWD then back to 2. Drive a mile or so in 2, then in all other functions. Oh yea also drive in reverse in all modes as well

Feb 05, 2015 | 2006 GMC Envoy

1 Answer

Why wont my 04 Envoy wont go into drive


The valve body has failed inside the transmission. . It's possible the shift solenoids or the transmission control module are faulty as well.

May 14, 2014 | 2004 GMC Envoy

1 Answer

2wd vs AWD


Page 13 of owner's manual says:
AdvanceTrac
(if equipped):
Illuminates when the AdvanceTrac
system is active. If the light remains
on, have the system serviced
immediately.
AWD locked (if equipped):
AWD
Illuminates when all wheel drive
LOCKED
(AWD) is engaged/activated. If the
light continues to flash, have the
system serviced.

Page 224:
ALL WHEEL DRIVE (AWD) SYSTEM (IF EQUIPPED)
Your vehicle may be equipped with an All Wheel Drive (AWD) transfer
case. With the AWD option, power is supplied to all four wheels
automatically with no need to shift between two-wheel drive and
four-wheel drive. If your vehicle is equipped with the AdvanceTrac
stability enhancement feature, you can change AWD modes, if desired,
by selecting AWD options through the message center.
For the lubricant specification and refill capacity of the AWD transfer
case refer to Maintenance and specifications chapter.
If your vehicle is equipped with AWD, a spare tire of a different
diameter than the road tires should never be used. Such a tire
could make the vehicle difficult to control as well as result in damage
to driveline components.
Utility and four-wheel drive vehicles are not designed for
cornering at speeds as high as passenger cars any more than
low-slung sports cars are designed to perform satisfactorily under
off-road conditions. Avoid sharp turns or abrupt maneuvers in these
vehicles.
The following sections, Normal operation, Autolock operation and
Disabling AWD, apply only to vehicles which allow the driver to change
AWD modes through the message center.
Normal operation (vehicles equipped with AdvanceTrac
During normal operation:
• the AWD system is in AWD AUTO mode (AWD LOCKED will
illuminate in the message center for four seconds when you first start
your vehicle). The AWD LOCKED indicator in the instrument cluster
will also come on.
• AWD AUTO mode can be overridden by pressing SETUP in the
message center. When you first press SETUP, AWD <AUTO> will be
displayed, then if you press RESET within four seconds of pressing
SETUP, AWD <LOCKED> will be displayed. AWD <LOCKED> provides
power to all four wheels constantly which allows you to operate your
vehicle in severe winter or off-road conditions such as deep snow, ice
or shallow sand. It is not recommended that you use AWD <LOCKED>
on dry pavement.

Page 225:
• AWD <LOCKED> can be cancelled by pressing RESET in the message
center. (The AWD LOCKED display in the message center will then
turn off and the display will return to AWD <AUTO> for four seconds
when the shift is complete.)
Autolock operation (vehicles equipped with AdvanceTrac
If the AWD system begins to overheat, the system will place itself in the
Autolock mode:
• the AWD LOCKED indicator light will illuminate in the instrument
cluster and AWD DISABLED <LOCKED> will be displayed in the
message center.
• AWD LOCKED will be displayed in the message center for four
seconds and a warning chime will sound. This condition may clear
without any action being taken by the driver.
• the AWD LOCKED indicator light in the instrument cluster will turn
off when the AWD system cools down.
• When the system is sufficiently cooled down, AWD AUTO RESTORED
will appear in the message center for four seconds and a warning
chime will sound.
Disabling AWD (vehicles equipped with AdvanceTrac
When a problem is detected in the AWD system:
• the AWD LOCKED indicator light in the instrument cluster will flash
eight times every two minutes in the message center.
• The message center will then display AWD DISABLED for four
seconds, then SEE OWNER'S MANUAL. A warning chime will also
sound. The warning displays and chime will continue until RESET is
pressed (which will clear the message from the display).
• AWD LOCKED can still be engaged by pressing SETUP (the message
center will display AWD <DISABLED> LOCKED), then pressing
RESET. The AWD LOCKED indicator light will illuminate in the
instrument cluster and the message center will display AWD
DISABLED <LOCKED>.
• To disable AWD, press RESET. The system will go back to AWD AUTO
mode momentarily, then the AWD LOCKED indicator light will flash in
the instrument cluster eight times every two minutes. The display will
then show AWD <DISABLED> LOCKED for four seconds and then
turn off.

Page 226:
• If a serious problem occurs with the AWD system, the AWD LOCKED
indicator light in the instrument cluster will flash 10 times every two
minutes. The message center will also display CHECK AWD and a
warning chime will sound. You can press SETUP to check the status of
the AWD system (which will display AWD <DISABLED> LOCKED),
but the AWD system will be disabled until the system is serviced.
Driving off-road with truck and utility vehicles
AWD vehicles are specially equipped for driving on sand, snow, mud and
rough terrain and have operating characteristics that are somewhat
different from conventional vehicles, both on and off the road.
When driving at slow speeds off-road under high outside temperatures,
use 1 (First) gear when possible. 1 (First) gear operation will maximize
the engine and transmission cooling capability.
Under severe operating conditions, the A/C may cycle on and off to
protect overheating of the engine.

Nov 30, 2013 | Lincoln Navigator Cars & Trucks

1 Answer

Expedition is AWD but drives all of the sudden like it's stuck in 4WL ????


There is a small difference in what you are saying here. "AWD" stands for All Wheel Drive. 1999 Ford Expedition is equipped with (A4WD) which stands for Automatic 4-Wheel Drive. There is a big difference between these two systems. The AWD has no driver controls and drives all of the wheels all of the time. the A4WD system ia capable of shifting in and out of 4WD automatically as needed, depending on wheel speed sensor data that indicates wheel slippage. The A4WD also has a 4WD Mode switch mounted on the instruent panel to allow the driver to override how the system operates.

FIRST, check to make sure that the 4WD Mode switch is in the "AUTO" position. If the switch is in the correct position, then you will need to scan your transmission and transfer case control modules and perform visual an functional inspection of the system to pinpoint the cause of the malfunction. It could be anything as simple as a defective mode switch to a major problem like bent/broken shifting forks inside the transfer case, requiring complete overhaul. Proper diagnosis will be required.

Mar 24, 2012 | 1999 Ford Expedition

2 Answers

When do i use my gmc envoy 2006 four wheel drive or awd


4x4 when you want it locked in all the time and all when you want it to decide when to kick in

Feb 01, 2011 | 2006 GMC Envoy Xl

1 Answer

How do you put a 2001 dodge durango in neutral to dolly tow it. I know to put the transfer case in neutral but can't seem to shift the transfer case into neutral, 4h and 4L and awd shift


If your going to put the front wheels on a dolly then it won't matter whether or not the front end is in neutral,if the rear is going to be lifted then it is a good idea to remove the drive shaft,this will keep the transmission from turning.

Apr 05, 2010 | 2001 Dodge Durango

1 Answer

Put newtransmission on 02cadillac dts.shifts,but stays on neutral


you did not apply vasoline to a nylon washer to keep it in place during assembly. the washers is out of place and will cause this problem
in the old rear wheel drive gm cars if this was done at least you had 1st gear only.

Mar 03, 2010 | Cadillac DTS Cars & Trucks

3 Answers

Wont shift back from 4x4 low, to 2x2


I also have a 2002 Envoy. Shifting to and from 4wh and 4wa can be done on the fly but shifting to 4wL has to be done stoped and while in neutral. Try that. Otherwise I'm afraid its a new computer for you. Its located under the left rear seat and you need a loan for one.

Sep 05, 2009 | 2002 GMC Envoy

1 Answer

1993 Grand Cherokee AW4 transmission issue


have you tried a rolling shift? leave trans in drive and try moving 4x4 lever. it works on mine!

Mar 14, 2009 | 1993 Jeep Grand Cherokee

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