Question about 1995 GMC Jimmy

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

Blew water out of vacuum lines to transfer case ( thanks for the tip ) and indicator light is now working. However, even though light indicates 4wd,and it sounds like it is engaging, it does not actually go into 4wd. Is there possibly a vacuum line on front axle with water in it that won't let it engage?

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  • Anonymous Dec 10, 2008

    I have the same problem

  • ctlack Dec 21, 2008

    the rubber boot on the aucator is torn how do you replace it?

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I had that problem on my 1996 not sure the proper term but there is a pin that was seized on mine and the pin is what locks the 4x4 in hope this helps

Posted on Feb 12, 2013

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My 1996 GMC Jimmy had the input shaft seal in the transfer case go bad which then let the transfer case pull fluid in from the transmission allowing it to overfill. This has led to transmission fluid clear up in the HVAC vaccuum hoses and actuators as well as the front axle servo.

Posted on Dec 21, 2008

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Just like previous poster. I had the same deal. I took out the battery and its tray. Underneath is
the servo which in my case had the vacuum line off. I put the vacuum line back on and put it
all together and my 4 wheel is working great.

Posted on Dec 20, 2008

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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

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Have 2004 Chevy1500z71&service 4wd message comes onafter it in 4H but it still worksHad fluids changed 2 yrs ago.Goes into 4wdfine&seems like it runs good. Comes on sometime even not in 4wd. Thanks


Which transfer case does your truck have ?
SERVICE 4WD
Refer to
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Transfer Case Description and Operation for the Transfer Case - NVG 149-NP3


?€¢
Transfer Case Description and Operation for the Transfer Case - NVG 246-NP8


?€¢
Transfer Case Description and Operation for the Transfer Case - NVG 261-NP2


?€¢
Transfer Case Description and Operation for the Transfer Case - NVG 263-NP1


The SERVICE 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and ground of the IPC. The transfer case shift control module controls the service indicator by sending the IPC a Class 2 message. This indicator may be controlled with the scan tool using the IPC device controls.
You should take it to the dealer an have it checked for DTC'S -diagnostic trouble codes

Jan 07, 2016 | Cars & Trucks

1 Answer

2003 F-150 regular cab automatic transmission and the 4WD will not engage.


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.
{ picture of shift motor }
-- If the vacuum shift motor does not move:
•Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
•Check the fuses for the 4WD system and the solenoids.
•Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
•Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
•Check the vacuum reservoir box for cracks.
•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.
•Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_111.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.

Jan 10, 2011 | 2003 Ford F150 Regular Cab

1 Answer

My 2003 F-150 will not engage the 4-wheel drive when the switch is turned on? Two days ago it worked fine and the light does come on?


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.

I am going to guess the drive shaft will not turn, and the problem is the shift disconnect motor on the front axle, or the shift solenoids.
The shift motor looks like this
37bcd6a.jpg

The shift solenoids look like this :
1a11fc1.jpg

You can check the shift solenoids with a vacuum gauge. The blue vacuum line is the 4WD operation, the pink is the 2WD operation. Pull the vacuum line at the shift disconnect motor, and install the vacuum gauge. Shift into 4WD and the vacuum should be on the line, and hold. If not could be the disconnect motor or the vacuum line to the motor.

Could also be the shift motor in the transfer case, but with the 4x4 light on the cluster lighting up, the transfer case should have shifted, the confirm comes from the transfer case to illuminate the 4x4 indicator on the cluster.

Feb 20, 2010 | 2003 Ford F150 Regular Cab

2 Answers

89 jeep cherokee 4 wheel drive won't engage gears arn't meshing and no indicator light


If you engage the 4WD with a switch instead of manually, there is a motor in or on the transfer case. Because of the location, these can go bad. u need to check all your switches and actuators there are actuators under vehicle that clog up with dirt.also try putting vehicle in neutral before engaging 4x4.
This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

Dec 21, 2009 | 1989 Jeep Cherokee

1 Answer

Four wheel drive lights come on but no four wheel drive


The light comes on indicating that the transfer case is engaged in 4wd, but that doesn't mean the hubs are locked. If you have automatic locking hubs, you should check to make sure they are working correctly. This GM vehicle may be equipped with vacuum locking hubs... meaning there is a vacuum line running from the transfer case selector to the hubs on each side. The vacuum makes the hubs lock into place. If those vacuum lines are damaged or missing, they wont lock. If you have electronic locking hubs, they may need to be replaced. Good luck.

Dec 09, 2009 | 1997 Chevrolet Blazer

1 Answer

4x4 indicator flashing all the time wnen not engaged


2001 Mitsubishi MONTERO 01 - Transfer Case > POWER TRAIN : TRANSFER CASE (4-WHEEL DRIVE) [Part 104000 ]
TSB No: 0223007 NHTSA ID: , November 01, 2002 : Replacement:
Summary: 4wd indicator lamp flashing / diagnostic trouble code (dtc) 33.

2001-02 Montero
A flashing 4WD indicator lamp and/or DTC 33 may be caused by corroded transfer case shift position switches. The original switches are susceptible to water damage, and new revised switches are available to prevent the problem.

PROCEDURE

1. Replace the five transfer switches

2. Clear the DTC, using the scan tool.

3. Test drive the vehicle to confirm the 4WD indicator lamp does not flash and DTC 33 does not reset.

Apr 08, 2009 | 2001 Mitsubishi Montero

1 Answer

2003 F-150 Supercew 4x4 won't egage


i had the same problem... even though i have an 04 heritage edition 4x4, manual shift lever, this should help you out... on the transfer case, there should be a plug just beside the forward drive shaft... even though mine is a manual shift, that plug lets the computer know that you are in 4wd... you also have a vacuum locking forward differential, the plug i referred to tells the computer to activate the vacuum system which engages the forward diff... i'm going to take my best guess that either the plug assembly on your transfer case might be bad, OR, you might have a bad vacuum module on your forward diff - even possibly a vacuum leak in the air lines coming from that assembly up to the firewall on the passenger side... just take a peak and see what you think, both the plug and vacuum assembly are easy fixes... (by the way, the vacuum module is a cylindrical unit that has an arm coming out of it that enters the diff... the module should be mounted directly onto your forward diff.)

Jan 12, 2009 | 2003 Ford F150 Regular Cab

2 Answers

1995 gmc jimmy 4wd high not working


sounds like it is loosing vacuum check all the lines for a crack even the engine lines will cause it to loose vacc. pressure. if it is not run to the vacuum reserve canister you may not have enough vacc. to hold the actuator in several times I just run new lines and that helped and not very costly.

Dec 22, 2008 | 1999 GMC Jimmy

3 Answers

My transfer case goes into gear but doesn't turn the wheels.


The lights can come on wihtout the transfer case really working..the lights are actvated by a simple switch and only indicate the switch has been depressed.

It's sounds as if you have a problem with the lickage, or maybe damage inside the transfer case itslef

Dec 20, 2008 | 2003 Ford F150 Regular Cab

1 Answer

4WD indicator light


on the transfer case there is a vacuum switch, check to see if there is any of the vaccum lines may have gotten crossed or the switch may be just defective

Jul 05, 2008 | 1995 Jeep Wrangler

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