2002 Chevy Tracker 4WD engagement pro...

2002 Chevy Tracker 4WD engagement problems

Posted in the Chevrolet Tracker Forum

First Prev
of 5
Next Last
Chuck Lind

AOL

#1 Jan 30, 2007
Hi..yesterday I was at my farm on the gaswells roads that were covered by 6+ inches of new snow. I usually tool around in 2WD until I need the 4WD. It's an automatic with automatic locking hubs.

I started up a hill, tried to engage it in 4WD, but the 4x4 light didn't come on, nor did it engage in 4WD. I backed up, put it in neutral, park, etc., but to no avail. I couldn't get the 4WD engaged. Finally, I was spinning the rear wheels in a desperate attempt to climb the hill. Finally, it engaged in 4WD.

This is the 2nd time I got in a "fix" with this. What might be wrong. Freezing cold weather? Something else.
wayne toman

Lower Sackville, Canada

#3 Dec 19, 2007
Chuck Lind wrote:
Hi..yesterday I was at my farm on the gaswells roads that were covered by 6+ inches of new snow. I usually tool around in 2WD until I need the 4WD. It's an automatic with automatic locking hubs.
I started up a hill, tried to engage it in 4WD, but the 4x4 light didn't come on, nor did it engage in 4WD. I backed up, put it in neutral, park, etc., but to no avail. I couldn't get the 4WD engaged. Finally, I was spinning the rear wheels in a desperate attempt to climb the hill. Finally, it engaged in 4WD.
This is the 2nd time I got in a "fix" with this. What might be wrong. Freezing cold weather? Something else.
I have the same problem and am thinking that it might have something to do with the vacuum motor that engages the front axle. I havn't had time to look at it yet.
wayne toman

Lethbridge, Canada

#4 Dec 27, 2007
I found the problem with the 4wd not engaging. There is an acuator motor under the front bumper and one of the magnets in the motor came unglued from the housing. Super glue seems to be working for me so far. The replacment part is around $350
George A

Bonavista, Canada

#5 Jan 7, 2008
Anyone know what fuse feeds the vacuum motor for the Chev Tracker?
Chris Root

Claremont, NH

#6 Jan 16, 2008
George A wrote:
Anyone know what fuse feeds the vacuum motor for the Chev Tracker?
According to our local gm dealer there isn't one. We are having to replace the acuator motor.
Brad

Bracebridge, Canada

#7 Nov 19, 2008
I had the same problem on my 2000 Tracker.

It was the wiring connector at the vacuum motor in the front bumper. One of the 3 wires had corroded inside the plug, and had pulled loose. I just cut it back a tad, stripped the insulation off, reinserted it into the hole, and used hot glue to secure it along with the other 2 wires, so they won't allow moisture to get in, and they won't pull out.

It's fixed now, and works like a charm again.
Andy

Windsor, Canada

#8 Jan 31, 2009
I had problems with 4wd engageing and procrastinated long enough to cause more problems. The 4wd was partially engaging(sounded like it was rounding the gears) but now doesn't work at all. Are there u joints that could fail here or hub issues???
Marty

New York, NY

#9 Mar 2, 2009
I am having the opposite problem. My 2002 tracker does not shift out of 4wd. I have to stop, put the truck in reverse, before it will release. The check engine light comes on when it is cold and it is usually cold when I need the 4wd.
LJS

Dudley, MA

#10 Jan 6, 2010
My 2000 Tracker doesn't go into 4WD. It is in the shop now and the mechanics are having a hard time finding the problem. They were able to get the wheels engaged, but the 4WD indicator light would NOT come on so now they think it has something to do with the computer. Has anyone experienced problems with the indicator light not working even if the actuator pump problem is solved?
Thanks.
Grady

Candor, NY

#11 Jan 6, 2010
ok I have a 02 chevy tracker zr2 2 door convertible, I go offroad alot there for in this season I need 4wd. i noticed when i was in four wheel high it pulled to the right and made a weird high pitched noise. then it would make a loud bang noise and jump back into 2wd. the next day i tried to use it and it did it again. later on that day i was going to check my mail which i use my tracker for and i got stuck in 2wd. so i stopped put it in 4 wheel high and nothing except 2wd. then i tried 4 wheel low, again nothing. now i tried 4wheel low with the power switch. Still nothing but one spinning wheel in the rear and i had to get pulled out which is embarasing being that i am usually the one pulling tow trucks out of trouble. any suggestions????
Mandy

Roanoke, VA

#12 Jan 28, 2010
I don't have my owners manual. What are the positions on the 4wd switch labeled as? Which is which?
TOMMYBOY

Moundsville, WV

#13 Feb 16, 2010
MY 4WD WONT ENGAGE IN 4WD IN 1ST BUT IT DOES WHEN IN BACKING UP EVEN IF ITS IN 2WD I FOUND A WIRE ON THE TOP OF THE TREN BUT CANT IF WHERE IT GO
Brian

Somerset, PA

#14 Feb 17, 2010
I'm having a similar problem with my 01 Tracker. I had it in 4WD but it just stopped working for no reason. No light on the dash and definately no 4WD. Ironically, part of the dashboard doesn't light up by the tach. Could it be related and any thoughts what it might be?
andrew Irwin

Toronto, Canada

#15 Feb 21, 2010
i have a 2002 chevy tracker. my 4x4 wont work, my light wont come on. i thought it was the actuator. but went under and disconneted the hose to the front diff and pluged the hose with my finger and the light comes on and there is suction on the hose. so i assume its not the vacum? is there some kind of check valve in the diff that could be faulty? anyone have a answer for me.
kriz-carr

Falls Church, VA

#16 Jul 14, 2010
This is a great system to avoid lockout hubs, if it was not prone to so many issues. Here is how it works: When you shift into 4WD-Lo or 4WD-Hi, a switch is closed which starts a low pressure air pump (about 5 to 8PSI) located behind the front bumper. This pump has an integral pressure switch, which lights the 4WD dash light when pressure limit of about 5PSI is reached (and held). The pump is connected to an actuator in the front axle housing, and it is this actuator ring that expands under air pressure to engage some teeth in the differential, which locks the differential to the axles, performing the same function as external lock out hubs. The pump should be able to expand the spring loaded actuator ring to engage 4WD within about 2 seconds, and will time out after about 10 seconds, if the pressure switch senses that a pressure of about 5PSI has not been reached in that time. When the tranfer case lever is taken out of 4WD, the switch is opened, which stops the pump and drops the pressure to the actuator and turns off the 4WD light because the pressure switch opens. The spring loaded actuator returns to the default 2WD position, and the differential becomes isolated from the axles.
Therefore, problems with the tranfer case switch, its wiring, the pump, its pressure switch, valving or wiring, hose connection from the pump to the drive axle, or inside the drive axle, or the actuator or actuator spring can all render the system inoperative.
My problem is that all components in my vehicle seem to perform to service manual specifications individually, but the system will not reliably engage. I am unsure if the actuator is supposed to be totally sealed, or if a little leakage is to be expected. My pump works fine if plugged, and can come on intermitently to make up for some leakage, but can not seem to keep up with the amount of leakage present in my actuator. Axle lube may help limit leakage, but everything appears marginal. Does someone know if the actuator is supposed to be air tight and should be replaced, or if everything is just marginal enough not to work?
benzo

Orchard Park, NY

#17 Aug 18, 2010
kriz-carr wrote:
This is a great system to avoid lockout hubs, if it was not prone to so many issues. Here is how it works: When you shift into 4WD-Lo or 4WD-Hi, a switch is closed which starts a low pressure air pump (about 5 to 8PSI) located behind the front bumper. This pump has an integral pressure switch, which lights the 4WD dash light when pressure limit of about 5PSI is reached (and held). The pump is connected to an actuator in the front axle housing, and it is this actuator ring that expands under air pressure to engage some teeth in the differential, which locks the differential to the axles, performing the same function as external lock out hubs. The pump should be able to expand the spring loaded actuator ring to engage 4WD within about 2 seconds, and will time out after about 10 seconds, if the pressure switch senses that a pressure of about 5PSI has not been reached in that time. When the tranfer case lever is taken out of 4WD, the switch is opened, which stops the pump and drops the pressure to the actuator and turns off the 4WD light because the pressure switch opens. The spring loaded actuator returns to the default 2WD position, and the differential becomes isolated from the axles.
Therefore, problems with the tranfer case switch, its wiring, the pump, its pressure switch, valving or wiring, hose connection from the pump to the drive axle, or inside the drive axle, or the actuator or actuator spring can all render the system inoperative.
My problem is that all components in my vehicle seem to perform to service manual specifications individually, but the system will not reliably engage. I am unsure if the actuator is supposed to be totally sealed, or if a little leakage is to be expected. My pump works fine if plugged, and can come on intermitently to make up for some leakage, but can not seem to keep up with the amount of leakage present in my actuator. Axle lube may help limit leakage, but everything appears marginal. Does someone know if the actuator is supposed to be air tight and should be replaced, or if everything is just marginal enough not to work?
kriz, did you figure it out...i am having the same problem. thanks, benzo
bob blankenship

Raleigh, NC

#18 Sep 9, 2010
Have the same problem. Started with slow to engage but now, won't engage at all. Dash light (4WD)does not light.

Pump removed ad check and works on bbench. But, does not work when installed. Where is the switch to provide power to the pump?

Does anyone have a wiring diagram for the 4x4 system?
tony in maine

Old Town, ME

#19 Sep 19, 2010
My recently acquired tracker came with retrofitted manually locking front hubs, I can only assume due to the failures others have mentioned on this board while the previous owner had it. Not sure if this is a viable alternative for others to try or how economically practical it is. I'm unsure of cost to the previous owner, but seems like it would eliminate any of the issues mentioned at the expense of convenience.
joe in pa

Tamaqua, PA

#20 Nov 15, 2010
My 2000 tracker keeps jumping into to 4 wheel drive for no reason what is wrong with it. i think it is the pump by the front bumper whats the name of it
jwhite

London, Canada

#21 Nov 20, 2010
i can't shift my 4 wheel drive shifter out of 2 wheel any one know if there is a sensor on the shifter or not! or what the problem might be

Tell me when this thread is updated:

Subscribe Now Add to my Tracker
First Prev
of 5
Next Last

Add your comments below

Characters left: 4000

Please note by submitting this form you acknowledge that you have read the Terms of Service and the comment you are posting is in compliance with such terms. Be polite. Inappropriate posts may be removed by the moderator. Send us your feedback.

Chevrolet Tracker Discussions

Title Updated Last By Comments
Towing behind motorhome Sun Kenny 1
Door lock fuse blown Sun Frederick8317 1
chevy tracker battery not charging (Jan '08) Jun 23 Mimi 17
2002 Tracker won't shift out of park (Mar '11) Jun 16 Mcdgirl 17
2001 tracker Apr '16 kim 1
tracker vibration (Oct '11) Mar '16 Skip 3
Transmission problems Mar '16 Excorsistix 1
More from around the web