Question about 2000 GMC Jimmy

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My 4wd doesn't engage at the front axle

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On my 2001 jimmy i had the same problem i fixed by changing the actuator on the front diff very simple and inexpensive

Posted on Feb 24, 2012

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Posted on Jan 02, 2017

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SOURCE: 4wd not working even though light indicates it's on

i have the same problem as well, but this is the solution i have found, which i have yet to try.

"look under the battery for th4 4x4 servo. it looks like a cruise control servo.
or could be the vac switch in the t-case. thses trucks were know for the vac switch to go bad. whick would cause it to **** tranny fluid into the vac lines to the servo. whick cause's the rubber to get soft and weak. which would cause it to not hold vac or tear the rubber."

from S-10 forums.

Please leave a reply to clarify if this fixes your problem as well.

Posted on Dec 17, 2008

mnabi01
  • 94 Answers

SOURCE: front axle wont engage

check the solenoid on right side of diff cover for operation

Posted on Jan 28, 2009

  • 103 Answers

SOURCE: front axle is not engaging when put i 4wd,2000 gmc

is the front tail shaft turning,if not problem is in transfer case

Posted on Jan 01, 2010

  • 14036 Answers

SOURCE: 1999 GMC Sierra 4WD -

SOUND LIKE TRANSFER CASE SHIFT CONTROL MODULE OR THE SHIFT MOTOR.CHECK 4WD FUSE.SOUND LIKE NO POWER GOING TO SHIFT MOTOR.

Posted on Sep 06, 2010

  • 209 Answers

SOURCE: i got a 1997 gmc

It would appear you have a failed CV shaft on your drivers side front. If the axle is jumping around, that means the 4wd is engaged, but the front wheels can't pull because the one axle is just freewheeling. Replace that left axle and you should be good to go. Might want to check the cv boots on the right side axle while you are there.

Posted on Aug 22, 2011

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2 Answers

Chevy 2002 2500 series, 4x4 will not engage, when shifted into 4wd a kind of grinding noise comes from the front like gears are not meshing.


No hubs on 2002 Chevy 2500. I'd check the front axle actuator (engages front axle when 4WD is engaged). Belive it's on the passage side axle tube of front differential. Could be wrong, but that's what it sounds like. Or the front ring/pinion is shot. They don't turn when not in 4wd.

Apr 08, 2015 | Cars & Trucks

1 Answer

I have a 1994 4wd grand cherokee jeep what makes it bump at sharp turn's


Sounds like the front axle in engaged,if it is command trac there may be a problem with the vacuum "motor" on the front axle.

May 21, 2012 | 1995 Jeep Grand Cherokee

1 Answer

The 4wd will not engage.


Most likely the front axle actuator,unhook it ,unscrew it from the axle ,then engage the 4x4 ,see if the actuator extends,if not it will need replaced.

Jan 31, 2012 | 1995 Chevrolet C/K 2500

2 Answers

Got. A 2003 f150 4x4 got problems with 4 wheel drive locking in and stay in drive shaft turning front wheels not


Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
- If it turns it is a problem with the transfer case.
- If it doesn't it is a front axle engagement problem ( this is what you seem to have, the transfer case is engaged and will drive the front shaft mine was a key on engine off test ).

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
sscullys_185.jpg
-- If the vacuum shift motor does not move:
1.Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
2.Check the fuses for the 4WD system and the solenoids.
3.Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
sscullys_187.jpg
4.Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
5.Check the vacuum reservoir box for cracks.
6.Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
7.Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_186.jpg

Usually the case is cracked vacuum lines from the solenoids, the next common is a cracked vacuum reservoir box, and 1 time I have seen the mount for the vacuum disconnect motor broken ( motor floating free so it could not push against the axle )
sscullys_188.jpg

Aug 28, 2011 | 2003 Ford F150 Regular Cab

1 Answer

I got a 1997 gmc jimmy 4wd my 4wd doesnt engage the front diff but it engages the ****** for low range ive checked my actuator pump and its moving but now i have a rattling noise in my front drivers side...


It would appear you have a failed CV shaft on your drivers side front. If the axle is jumping around, that means the 4wd is engaged, but the front wheels can't pull because the one axle is just freewheeling. Replace that left axle and you should be good to go. Might want to check the cv boots on the right side axle while you are there.

Aug 22, 2011 | GMC Jimmy Cars & Trucks

1 Answer

I can not get power to the motor to engage my front axle on my 4x4.


Power as in 12 V DC ? if yes, you are not in the correct area, the front axle is locked in and out of 4x4 mode with vacuum.

Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).


Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
- If it turns it is a problem with the transfer case.
- If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
sscullys_200.jpg
Item #10 in this diagram
sscullys_10.gif
-- If the vacuum shift motor does not move:
1.Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
2.Check the fuses for the 4WD system and the solenoids.
3.Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
4.Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
5.Check the vacuum reservoir box for cracks.
6.Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
7.Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_199.jpg

- If the front drive shaft turns:
For ESOF system
-- Check the fuses for the transfer case, engine compartment fuse panel, 17 & Cab fuse panel fuses 13 and 23 ( verify with owners manual, 97-97 & 99-03 MY can be slightly different on some items ).
-- Try hitting the transfer case with a dead blow hammer ( do not use a metal hammer, it can damage the transfer case ) to see if the transfer case shift motor is hung up .
-- Check the transfer case connector, to make sure the connector pins are clean and making good contact.
For MSOF systems
-- Check that the shift linkage on the transfer case is moving when the lever is moved from 2W to 4H and 4L.

Jul 30, 2011 | 2000 Ford F150 Flareside SuperCab

1 Answer

1997 Ford F-150 4x4: Electronic four wheel drive will not engage. Was working then wouldn't engage when it was below 32 degress. But once warmed up would engage. But now it will NOT engage at all. The...


Lift and support the front of the truck so the front wheels are off the ground.
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

There are the two lines that operate the diaphragm on the axle. Facing the truck, the right solenoid (pink & black lines) is activated to disconnect the axle and go back into 2WD. The left solenoid (blue & white lines) lock the axle into 4WD

you'll have to get a vacuum source like a Mighty-Vac hand pump and apply vacuum to the pink and blue lines, one at a time. If one leaks down you'll have to check the line, including the diaphragm, to locate the leak. If vacuum was held, reconnect the bottom half of the line "connector" (black & white lines) to the solenoids and crank the truck. Switching from 2WD to 4WD and back verify each time that there is vacuum on the top nipple of the activated solenoid. If you're in 2WD the right solenoid (pink/black) should be sucking, in 4WD the left (blue/white) should be. If these operate as described then you axle shift fork may be bad. If you're not getting vacuum when you should be, replace the solenoid.

The Vacuum shift motor ( item #10 in the diagram )
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Close up :
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Vacuum shift solenoids

2eae686.jpg

The other source of the vacuum leak ( if the lines to the solenoid test good ) is the vacuum box behind the battery.

Oct 17, 2010 | 1997 Ford F150 Regular Cab

1 Answer

2003 f150 crew 4wd Lost 4WD tranfer case locks


Lift and support the front of the truck so the front wheels are off the ground.
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

Nov 30, 2009 | 2005 Ford F-150

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