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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Jan 08, 2016 | Cars & Trucks

1 Answer

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


There is an actuator located in the front differential " About 15 minutes to change " . By transfercase actuator , do you mean the Encoder Motor " transfercase shift motor ? 9 times out of 10 it is either the front differential actuator or the transfer case encoder motor

Feb 15, 2015 | 2004 Chevrolet Tahoe

1 Answer

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

2000 chevy siverado z71 4x4 not working


Yes we can ! With the light on and or flashing , DTC'S - diagnostic trouble codes are stored in the 4X4 control module . Have the codes check , not at auto zone or any other parts stores . There code reader tool will not pull this codes . Need to take to a qualified repair shop . Testing also needs to done , not guessing an throwing parts at it . This 4X4 system can set a number of codes .
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error

DTC C0387 Unable to Perform Shift
Circuit Description
The transfer case encoder is a switch that converts a shaft position, representing a mode or range position, into electrical signals for use by the transfer case shift control module. The encoder houses 4 Hall effect sensors that are used for channels P, A, B, and C. These sensors provide a path to ground, when a magnet, (part of the Motor Encoder), passes over them.
The transfer case shift control module supplies an 8 V reference and a ground circuit for the encoder hall effect sensors to function.
The transfer case shift control module supplies current limited 5 V on all the channels, thus as these channels are pulled to ground, the module can interpret the location of the transfer case shift position.
This DTC detects that the transfer case is unable to successfully complete a shift to a requested mode or range.

May 07, 2017 | 2000 Chevrolet Silverado 1500

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

4 Answers

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...


If I'm not mistaken, there should be a module or relay. Not for sure where it's at. Heard of these going out and not being able to switch into 4 wheel drive. I know on a 200'? Ford F-250 they have a motor on the side of the transfer case. That switches it into 4 wheel. Signal from 4x4 switch is sent to module then to the motor that engages the transfer case. Hope this makes sense. Hope this helps.

Feb 24, 2010 | 1994 Chevrolet S-10 Blazer

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

Mar 30, 2009 | 2002 Chevrolet TrailBlazer

2 Answers

4x4 button sticking


Hello there.Im assuming you have a push button 4 wheel drive,if so you have a bad electric shift motor on the transfercase,faulty shift button or your transfercase is worn and the elec. motor is having trouble shifting it in 4 wheel drive.Hope this helps.John.

Mar 10, 2009 | 1992 Ford Ranger

1 Answer

Denali slips in and out of 4x4


How may buttons for the 4X4 two , three , or four ? Do the lights flash ? Any messages - service four wheel drive system ? Which transfer case does it have ?

Transfer Case - NVG 246-NP8 (Two Speed Automatic)
The transfer case shift control module uses the VIN information for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine. The system does not know which calibration to use without this information.
Transfer Case Encoder Motor
The transfer case encoder motor consists of a permanent magnet (PM) DC motor and gear reduction assembly. It is located on the left hand side (drivers side) of the transfer case. When activated it turns the sector shaft of the transfer case (clockwise or counter clockwise) to shift the transfer case. The encoder motor is controlled with a pulse width modulated (PWM) circuit within the transfer case shift control module. This circuit consists of a driver on both the Motor Feed A and Motor Feed B circuits. The encoder motor is bi-directional to allow the motor to shift the transfer case from 2HI or 4HI to NEUTRAL and 4LO positions.
Transfer Case Encoder
The encoder is mounted to the transfer case encoder motor assembly and is replaced as an assembly. The encoder converts the sector shaft position (representing a mode or range) into electrical signals inputs to the transfer case shift control module. The module can detect what position the transfer case is in by monitoring the 4 encoder channels (P, A, B, and C). These inputs translates into AUTO 4WD, 2H, 4H, NEUTRAL, and 4L or in transition between gears.
Transfer Case Motor Lock
The transfer case motor lock is used to provide a 2H, 4H, and 4L lock-up feature. When the lock circuit is energized, the transfer case encoder motor is allowed to turn. When the transfer case is placed 2H, 4H, or 4L the motor lock circuit has no power provided to it and the lock is applied. This assures that the transfer case remains in the current gear position. When AUTO 4WD is selected the motor lock remains applied until an adaptive mode (torque is applied to the front propshaft) is required. During an adaptive mode the motor lock circuit is energized and the motor lock is released, enabling the encoder motor to turn and apply torque to the front propshaft.


SERVICE indicator (4WD/AWD) Lamp
The SERVICE indicator (4WD/AWD) lamp is an integral part of the cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle of malfunctions within the automatic transfer case (ATC) system. The SERVICE indicator (4WD/AWD) lamp is controlled by the transfer case shift control module via a Class 2 message or by a Sevice Indicator Control Circuit.

The first thing to do before assuming it's a loose wire would be to have it checked for codes , auto zone , advance etc... can not check this codes .
DTC B0768 Service Indicator Circuit High
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0357 Park Switch Circuit High
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error

If you know nothing about this , your best bet would be to take it to a qualified repair shop .

Apr 29, 2017 | 2000 GMC Denali

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