Question about 1999 GMC Jimmy

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Removing the 4wd selector motor off the transfercase

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Remove the frront drive shaft then the yoke. Their are three 10mm head bolts holding the shift motor in place. Removing the skid plate will make everything easier to get to.

Posted on Jun 23, 2009

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Posted on Jan 02, 2017

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2008 Dodge Ram 4WD LOW light blinks while running in 2WD. When applied the 4WD High works fine as well as the 4WD LOW but the light keeps blinking and you can hear the system trying to apply 4WD LOW


Replace the motor/module on the transfercase. It has an internal short. Don't replace it. Soon you will have to replace or rebuild the transfer case and the motor.

Oct 31, 2014 | 2004 Dodge Ram 1500

1 Answer

Service 4 whell drive on dash I replaced front actuator and encoder motoron gmc sierra but still no 4 wheel drive I also changed the dash switch all fuses are good what ami missing?


The 4WD transfer case encoder motor position sensor or the selector switch may fail causing the service 4WD message to be displayed. Fault code(s) stored in the transfer case control module will be of assistance in determining the exact fault causing the message to be displayed.
I have found out that usually the two ground wires that are attached to the frame right under the front of the driver's door is the culprit that causes the 4wd selector switch in the dash to go bad. Chevy had the bright idea of applying the undercoating and/or not cleaning the point of contact of the ground wires before they bolted them to the frame therefore overtime moisture, dirt and corrosion affects the contacts of the threads of the bolts which are the only source of ground the two sets of wires have. There are 2 things you will need to do. First you will need to take the bolts out and use a wire brush to clean down to the metal of the frame as well as the bold threads and ends of the wire attachments and then reattach the ground wires to the frame (time to complete - less than 5 minutes). Second you will need to replace the 4wd selector switch in the dash. You can purchase this online from Amazon (Dorman 901-062 4-wheel drive switch for $31.15 - no tax or shipping and handling). To replace, gently pull the outer trim of the dash out by using just your fingers. You do not need to completely remove it, just pull it out far enough so that you can pull the old switch out of it slot. Then unplug the two plugins located in the back of the switch. Plug them into the new switch and push the switch back into the slot and then push the trim back into place (time to complete - less than 5 minutes). This should take care of your problem. Most often, people make the mistake of just switching out the dash switch and when that does not correct the problem they then replace the more expensive and time consuming actuator motor and location indicator on the transfer case that does not need to be replaced. I should point out that when the Service 4WD light comes on

Jan 17, 2014 | 2000 GMC Sierra

1 Answer

Check 4wd light on


could have faulty 4WD switch or could have faulty transfercase shift motor or shift control module.

May 20, 2013 | Cars & Trucks

1 Answer

Wont shift into 4x4


Two posibilities, the manual silonoid(could be operated by vaccum or electric 12V) on the front axle is not operating or the transfercase is not shifting into 4H. Transfercase manual or electric ? Jack up the front end put it in 4WD and see if the front end is locking ? Wheels should spin the opposite dirrection or turn the front driveshaft, that means it is working and the problem is in the transfercase shifting into 4WD Mike n Texas

Jan 25, 2013 | 1999 Chevrolet Silverado 1500

2 Answers

2004 traiblazer extended service 4 weel drive light comes on after 10 minute drive 4wd not working after that. light on 4wd switch is off. if a leave the truck alone for a day, 4wd will work....


I would find an independant shop that has a Tech 2 or equal scan machine....these can communicate with your TCM (Transfercase Control Module) and narrow down what the problem is.

Jun 23, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

My 4wd dash selector bottons are very intermittent. the lights seldom work ( at key on / for short time ) . 4wd hard to engage when dash select is'nt working.


COULD BE EITHER THE SWITCH OR TRANSFERCASE MOTOR. YOU MUST TAKE IT TO A SHOP AND HAVE IT SCANNED. BOTH OF THESE ITEMS ARE FAIRLY COMMON. THANK MOTOR62500!

Dec 21, 2010 | 2001 Chevrolet S-10

1 Answer

4buy4 will not work, light comes on., transfercase dose not engage the front wheels


take the plug loose that is on the lower side of the front axle and test it for voltage while the selector lever is in 4wd. it should have at least 12v. if so it is that solenoid. generally what goes wrong with those vehicles.

Dec 14, 2010 | 2003 Chevrolet Silverado 2500HD

2 Answers

98 Chevy Sub when I push the 4wd switch the light lights up but no noise and no 4wd no indication of problems before this


95 percent of the time it is the 4wd actuator on the passenger side of the front differential. They are about 70 dollars from the local parts store. They go out all the time. just unplug the wire connector and unscrew the actuator with a large wrench. I think its a 1 1/4" size. Make sure you have any of the lights lite up on the 4wd selector. If none light up then your fuse is blown.

Jan 08, 2010 | 1998 Chevrolet K1500

2 Answers

My 4WD is not working. Whether I put the selector


Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

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 :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.

Here is a block diagram of the IWE system
5e79745.jpg

Here is a link to the TSB for the IWE solenoid in PDF format
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

Dec 14, 2009 | 2006 Ford F-150

1 Answer

Elelectronic 4wd


i had the same problem the lights on dash would light up but would not work so i checked the motor on back of transfercase and found out it was the motor was no good some times they can get wet or dameged and not work i would start there if you havent already

Aug 16, 2008 | 1991 Ford Ranger Supercab

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