Question about 2001 GMC Yukon XL

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Will not come out of 4 wheel drive

I have to disconnect the electric plug on the diff motor to get it to shift out of 4 wheel drive.

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  • martin_prinz Jan 13, 2009

    I have replaced the switch on the dash and the unit that screws into the differential.



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Posted on Jan 13, 2009

  • Ronnie Wilson Jan 14, 2009

    Then its Got to be between your bypass point and the Switch ( wiring)



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SLT. Why doesn't 4 wheel drive work?

If 4x4 is electronic shift, possible decoder motor problem ( common ). The motor is bolted to the t-case and operates the engagement. Have someone operate the shift button while listening to the motor at the t-case. If the motor is ok, you should hear the engagement and the problem will be most likely a vacuum issue to the front diff not allowing the hubs to lock in. If there is no noise heard from the t-case, try tapping on the motor to see if it activates. If it does, suspect an internal motor issue and replacement will be required. Also, check wiring connections to motor for any burned/melted wiring that could indicate a problem

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See that this is an old problem. Some of the knobs could crack on the backside and allow the knob to rotate on the shaft without turning the shaft at all. If the knob is okay then go underneath the vehicle and disconnect the electric plug on the shift solenoid and Inspect for corrosion on the terminals. There is a problem which can happen if an indicator light burns out in the electric shift models. The length of the shift solenoid plunger is what determines whether you are in 2 wheel or 4 wheel drive, or high or low range. If the indicator light burns out, it changes the electric power and position of the shift solenoid plunger.

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2004 Ford Explorer AWD. what could be wrong? abs light is on, 4 wheel drive ligh is flashing, truck is stuck in 4 wheel drive

Sounds like you have an electronic shift diff to put it in 2 or 4 wheel drive. You could have a bad position sensor, or shift motor/linkage problem. Unfortunately, unless you have the diagnostic tool to see which is the problem, it is best to take it too a good tranny shop.

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Abs light is on, 4 wheel drive is flashing,

Sounds like a bad diff control, or diff linkage. Either way, sounds like you have an electronically shifted diff and the problem lies with that control board, or the mechanical part of the controls.

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Transfer case stuck in 4wd

Your encoder motor is broken or your front diff actuator is stuck try checking your fuses then pull your actuator is it working? Shift it in 4 wheel while parked listen for it to shift if it doesn't make a shifting sound most likely your encoder motor. Most likely one of those problems if not gonna have to open up your transfer case and inspect for problems might be your linkage to your shift forks if your shift selector sprocket isn't turning when your motor shifts could make sense why it is stuck in 4 wheel drive.

Nov 30, 2011 | 2002 Chevrolet Silverado 1500HD

1 Answer

My '96 Suburban 1500 4x4 won't shift into 4 wheel drive. When I push the button for 4 Hi the light just flashes and stays in 2 wheel drive.

the electric shift motor on transfer case is bad, replace and it will work great. if your at all mechanically inclined you can do this very easy. before unbolting motor disconnect battery to reset computer install part, should only take you 15 min maybe then hook up battery and you will have 4 wheel drive again. good luck

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1 Answer

The transfer case will not shift into 4 wheel hi or low 4 wheel drive auto with elect shift

I would suspect the vacuum disconnect motor or the vacuum solenoids for the disconnect motor ( or the vacuum lines ), but best to confirm
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.

With the engine running ( and wheel chocked, parking brake on ) have someone shift into 4WD, and watch the shift motor to see if it operates
It is on the front axle, looks like this

If the disconnect motor does not shift, you can check the vacuum on the lines with a vacuum gauge. Blue line is 4WD operation, pink line is 2WD operation.
The vacuum solenoids are on the firewall, and look like this

This is the block diagram for the ESOF vacuum operation of the disconnect motor.

This is assuming you have checked the fuses for the transfercase shift motor, and the vacuum solenoids.

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there should be a front diff lock actuator right in the side of the front differental that has an electrical connector that u have to unconnect and unscrew the actuator and replace. this part will run you about $100 and should take about 10 minutes to install. or another alternative is they have a manual kit out that replaces the actuator and it is a pull cable instead of an electrical job.

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Check to see if you are getting power through your switch on your dash. I also suspect your shift motor but it is a lot easier to check it with a test light.

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