Will not shift into four wheel low - 2001 Nissan Frontier Crew Cab

Try shifting the shift selector into Neutral first then try engaging 4wd low. If that doesn't work try shifting into 1st gear and then try engaging 4wd low. The information is inside your owners manual but if this doesn't work please let me know. Also is the light on for which mode your truck is in (2wd or 4wd high)? If not, you may want to check for a blown fuse.

On the transfer case
Transfer Case - Electronic Shift
The four-wheel drive electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4WD HIGH, and 4WD LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators: one for 4WD HIGH which appears as 4WD, and one for 4WD LOW, which appears as 4WD LOW. Shifts into 4WD HIGH can be made at any speed. When shifting into 4WD HIGH with the vehicle stationary, tooth blockage may occur preventing shift completion. When the vehicle is driven above 8 km/h (5 mph) the shift will complete. When shifting in or out of 4WD LOW, the four-wheel drive (4WD) control module requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission be in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission).
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and range fork within the transfer case between the 4WD HIGH, 4WD LOW, and 2WD range positions.
The four-wheel drive (4WD) control module controls the gearmotor encoder assembly that shifts between 4WD HIGH, 4WD LOW, and 2WD modes.

are you in four wheel low or four wheel hi. if you are in four lo, put vehicle in neutral before trying to shift out and be at a complete stop. if you were in four hi, put vehicle in reverse and keep backing up, usually 4wd while come out and go back into 2wd

Four wheel High is what you need to use in snow. It is similar to your regular driving experience but your speeds should not exceed 45-50 mph. Shift through your normal gears as necessary and drive with appropriate caution. Four wheel High should be used only as long as driving conditions warrant, using it otherwise can cause unnecessary wear on your transmission and drive-train as well as lower fuel economy.

Four wheel low is used for pulling out of a ditch if you are stuck, going through deep mud or rock crawling. Four wheel low will also cause your vehicle to lurch every time you press the gas pedal.

so the front driveshaft turns in 4 low? or you just feeling gear reduction in 4 low?if the front drive shaft will not turn in 4 or 4low then suspect a shift fork broken. when i say turn i mean under engine power.

Do you have it in neutral? Transmission has to be in neutral to shift into and out of 4 low.

Four low is almost never used. I use it on very steep rocky or muddy trails in the woods or to pull someone out of mud or a ditch. Though some will shift standing still it is best do do this while rolling. Four high can be shifted at low speeds of 2 to about 35mph (higher also but not really good idea) Low can only be shifted between 2 to 10mph. If you find yourself stuck and unable to shift because you aren't rolling you can also turn the engine off, engage the transfer case and re-start. That avoids having the gears clashing together. Best rule is if it begins to grind, don't force it.

I also have a 2002 Envoy. Shifting to and from 4wh and 4wa can be done on the fly but shifting to 4wL has to be done stoped and while in neutral. Try that. Otherwise I'm afraid its a new computer for you. Its located under the left rear seat and you need a loan for one.

Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!

Put the transmission in neutral, emergency brake off, foot off the brake pedal, now try shifting out of 4 wheel drive low. If that doesn't work, drive forward, and again do the above, trans. in neutral, roll to a stop, foot off brake, try to disengage. What you're probably experiencing is called drive shaft 'wind up', and it is very difficult to disengage, but do the above and it should shift out of 4 low. countrycurt0