Question about 1998 Chevrolet Tahoe

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Transfercase control module

I replaced shift motor on transfercase but 4x4 still dosn't work. auto 4x4, 2 high, nuetral and 4 lo lights randomly come on. where is transfercase control module is located?

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I fould my yhis morning. I have 1997 GMC Suburban the Transfercase Module on my is Driver Side under Dash Left of Steering Column. Rectangle Silver box approx.5" long white connections. Good luck getting to it took me quite a while. There are 2 Screws on bottom of Module and 1 tab on top that is difficult to unhook. Where is the Shift Motor on Transfercase.

Posted on May 10, 2009

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Most of the time, the switch is bad. Hope this helps.

Posted on Mar 26, 2009

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2004 Tahoe 4x4 will not go into 4 hi or lo. Changed switch on dash and actuator on transfer case.


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Feb 15, 2015 | 2004 Chevrolet Tahoe

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I have a few99 gmt jimmy with the automatic 4x4 buttons. I can't get it out of 4x4. Please help


Well from experience 99%. Of the time its not the actuator if it shifts into 4 lo and back to 4 hi. The book really sucks at this diagnosis. And if lights on buttons blink for 2 hi for a bit then stay in 4wd then u have to listen very carefully. When shifting from 4 hi. To 4 low the whine or growling noise from motor is heard. If, when shifting from 4 hi to 2wd this motor noise is heard, then actoator or wiring is the issue. If the time while 2wd light is blinking, ie: its trying to shift, no noise from motor or actuator is heard, then shift module has a burnt output. Now. Before replacing any of the components, if you have a schematic of this system, you would be confused on how any of it elworks even if you are a seasoned professional. I wouldn\'t bother 2 much with it as long as you theory inspect Evey millimeter of all the wires from actuator connector (on transfercase) to where it goes through metal and enters occupant compartment. If all wires look good. Lights in all 3, or 4 if u were lucky in neutral which means error, of the lights work, and if requested position is depressed on switch and motor tries to turn or does and clynks are heard , then actuator position switch is stuck and actuator is needing replaced, as not a serviceable assesembly, and I haven\'t had the ability to tear one apart. But if all lights work and when the selected switch button , example 4 WD, 2 WD or 4 lo, and no motor noise like heard when other shift works, them module is to blame. Now, I am a master mechanic with most experience at a gm dealership, I have fought with this system multiple times, and once I employed this diagnosis it has never failed me again. And the stack of 4wd shift modules in my bottom toolbox dawyer. Most times if won\'t shit at all night be actuator but not likely, 95% of the time when this issue rolled through dealership, it took a module to fix it.

Jun 23, 2014 | Cars & Trucks

1 Answer

No four wheel drive


problem could be transfercase shift control module.or check 10 AMP fuse to the front axle switch since the transfercase module will send a signal to engage front axle then transfercase encoder is mounted to the shift motor so the transfercase control module control shift control motors also transfercase speed sensors.the transfercase assembly complex system work on since every thing electronic controlled.

Nov 28, 2013 | Cars & Trucks

2 Answers

I just bought a 2000 Nissan Frontier and I'd like to know the correct way to shift on the fly into and out of 4WD? I don't want to mess it up. Also is it ok to use 4WD if pavement is just wet or will that...


you can shift on the fly from 2 hi to 4 hi at any time as long as you are not under power or in other words on the gas. Hold at a steady speed or let up on gas pedal a little bit then shift, DO NOT shift truck when vehicle is speeding up or taking off. Also do not shift when wheels are spinning or when you are turning a corner. The same goes for shifting from 4 hi to 2 hi. ** Now to shift into 4 lo the truck should be stopped and put trans shift into nuetral then shift transfercase into 4 lo, and never exceed 25 mph in 4 lo position !!!!!!! To shift out of 4 lo and go to 4 hi or 2 hi stop vehicle and shift trans into nuetral then make your 4x4 shift then put trans into forward or reverse gear and VROOOOOM your on your way. Remember to NEVER and i mean NEVER shift into 4 lo while vehicle is moving forward or reverse as you will do serious damage to any and all parts of drive train. You should not run 4x4 at all unless you need to pull something where you need extra traction like a boat out of water,a stuck vehicle,or if roads are slippery, or muddy. also don't be alarmed as sometimes when in 4 wheel drive and you turn corners you will notice a binding or jerking motion, this is normal and if this is occurring i would recommend going back to 2 hi position. HAPPY TRAILS to you with the new toy. I only buy vehicles with 4x4 and have never owned a 2 wheel drive in my 31 yrs of driving. I love the idea that i have extra power and traction options when i need it,the only bad thing is your boss says " what do you mean you can't make it in,you have a 4 wheel drive!

Feb 06, 2011 | 2004 Nissan Frontier

1 Answer

I have a 1992 Jeep wrangler and i don't know how to switch from 2hi to 4hi or 4low. Can someone help me out?


well do you have a switch or push button selector or a actual floor shifter? Ok, when you are driving you can and only should shift from 4 hi to 2 hi and 2 hi to 4 hi at any speed as long as tires are not spinning and you are not on the gas. when shifting, release gas pedal slightly and shift. do not shift lets say when you are taking off at a light, this would be under power and will do damage to drivetrain. also you can shift at any time while vehicle is at a stop position. Now when shifting into 4 lo the vehicle must be stopped and should be put in nuetral and when shifting out of 4 lo the vehicle must be stopped and in nuetral also as to not damage drivetrain. Never drive faster than 25 mph in 4 lo as you will damage drivetrain. When i say shift i mean either push the button to 2 hi or 4 hi or turn selector knob to position desired, or push , pull shift lever on floor to desired position. I dont know what your set up is . but they all use the same instructions as how to shift the 4x4 selections

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I have a 1994 S10 Blazer with 4.3 Vortec engine. My 4X4 is not working properly. It is sort of intermittently working. When I depress the 4X4 LO position on the switch, there is no indication of anything...


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1 Answer

4 lo working, 4 hi stopped working , A4WD never worked


Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer

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2 Answers

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