Question about 1994 GMC Sierra

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4x4 is not working on my truck.

When i try to switch to 4x4 low the truck does not go into 4x4, just low range.

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Is the truck working on 4x4 high? you can jack the truck to have the four wheels off the ground and check if the front driveshaft is rotating while the 4x4 low is engaged

Posted on Mar 25, 2014

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1 Answer

Where are the fuses for the 4x4 located on a 05 envoy


This not a fuse problem. When you switch to A4WD or 4HI, do the indicator light for those positions stay on solid or do they blink and then return to 2HI position? If so, then there is probably a problem with the transfer case actuator/motor.

Aug 10, 2012 | 2005 GMC Envoy

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I own a 1999 Expedition that I used the 4wd High on 2 dayss ago and never used the 4wd Low at all. As I got home a put it back into AWD and parked it. Two mornings later I climbed into it to take my...


This is very strange because of How the low range is engaged. I drive a 1999 F150 4x4 which has the same dash and controls for the 4x4 as your Expedition. I do know that the fan control switch is unfortunately the same shape and very close to the 4x4 switch. It is easy to grab the wrong knob and turn the wrong thing than was intended.

My initial impression is if it is possible, your girl could have reached over to move the fan switch and actual grabbed the 4x4 switch instead. Or you were warming up the Expedition and meant to turn up the fan and instead turned the 4x4 switch to Low. Or a backpack she was moving with schoolbooks could have hit the switch. What puzzles me is that to go into Low range, you need a foot on the Brake and simultaneously need the gearshift in Neutral and the 4x4 selector in Low. That is 3 things to make the low range happen.

Even if your foot was on the Brake and the sensors caught the gearshift going through Neutral on its travel to Park, the 4x4 Selector would have to be in Low. There is one problem you can have with the 4x4 Selector.***The Selector has 3 Resistors and a LED bulb.***

You stated the Selector switch was good. This would mean there were 3 different Voltages under the vehicle. Sometimes when the LED bulb burns out, it shifts the Voltage out of range for the Servo, and although the Selector says one thing, the Voltage at the Servo has the wrong value for that function. Since the dash light and the Servo agree on Low, it would seem the Selector is out of sync with the other 2 parts.

I hope my solution is very helpful in solving your problem.

Mar 26, 2011 | 1999 Ford Expedition

1 Answer

I have never driver a 4 wheel drive. I am going from portland oregon to phoenix az. not sure how or when to switch to four wheel. does the truck need to be in park? etc.


Do you have manual locking hubs on the front? If you do, you have to turn them to 'lock' position. If you have automatic hubs, you skip that step. Never shift into 4x4 low range while moving. You must come to a complete stop to shift in or out of low range. Regular 4x4 (high range) can be engaged while you are moving. Let off the gas, and put it in 4x4 high range, do the same to go back to 2 wheel drive. Vehicles that are part time 4x4 (can be shifted in and out of 4x4) should never be driven in 4x4 while on a dry surface, as you can cause excessive wear or even failure of the system. So only use it in snow, off road, etc. Have a safe trip!

Dec 13, 2009 | 1994 GMC Jimmy

3 Answers

Stuck in 4x4 low range


My wife just recently had a similar problem. She got stuck in the mud and put our 2004 F150 in 4x4 Low to get out. She didn't. Had to have AAA pull her out. She then left a bit later and the truck was still in 4x4 Low even after switching to 2WD. She even tried going backwards to get it to switch. So she called me frantically because the car would not go over 10 mph w/o the RPMs getting way too high. I said I'd call her back. So I called our local Ford Repair shop and he gave me these instructions (loosely based on what the owner's manual says to do) 1. Start Vehicle 2. Switch to 4x4 Low 3. Put in Neutral 4. Switch to 4x4 High 5. Go in Reverse for a bit and then Forward a bit again (You should now be in 4x4 High) 6. Put in Neutral 7. Switch to 2WD You should now be good. If that didn't work, then try repeating step 5 after step 7. Which reminds me. I really should call her back :) (It worked)

Feb 26, 2009 | 2005 Ford F 250 Super Duty

1 Answer

1994 ford ranger 4.0 4x4 supercab


My wife just recently had a similar problem. She got stuck in the mud and put our 2004 F150 in 4x4 Low to get out. She didn't. Had to have AAA pull her out. She then left a bit later and the truck was still in 4x4 Low even after switching to 2WD. She even tried going backwards to get it to switch. So she called me frantically and I said I'd call her back. So I called our local Ford Repair shop and he gave me these instructions (loosely based on what the owner's manual says to do)

1. Start Vehicle
2. Switch to 4x4 Low
3. Put in Neutral
4. Switch to 4x4 High
5. Go in Reverse for a bit and then Forward a bit again
(You should now be in 4x4 High)
6. Put in Neutral
7. Switch to 2WD
You should now be good. If that didn't work, then try repeating step 5 after step 7.

Hope that helps, as it worked for us.

Feb 22, 2009 | 1994 Ford Ranger Supercab

1 Answer

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I have a 1992 4x4 eddiebauer edition and unless I was doing 25 miles an hour mine would not kick in either. For low range I had to put it in 1 on the gear shifter

Jan 08, 2009 | 1994 Ford Explorer Limited

2 Answers

4wd high range does not lite or engage


I had the same problem with my 98 sierra 4x4. Turned out that the electrical activator on the transfer case was not working. It will still go into 4 low but not 4 high. Replace the electrical switch on the transfer case and it should work again.

Dec 29, 2008 | 1998 GMC Jimmy

1 Answer

97 expedition is stuckin low range 4x4


Did you try putting it in neutral for 15 seconds then switching it back to 2 wheel?

Dec 15, 2008 | 2003 Ford Expedition

3 Answers

Can,t get truck out of 4x4 low range


try putting your truck in neutral and then shifting into 2 wheel drive shift on the fly does not apply to 4 low only 4 high and on electric shift models it wont shift unless your ****** is in neutral.

Aug 26, 2008 | 1999 Ford F250 Regular Cab

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