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Four wheel drive vehicles with inside the vehicle four wheel select buttons etc. have plug in four wheel drive control modules, you need to find where yours is located some are under the dash, behind the glove department. others are under the battery box..it can be a DIY job. they are somewhat expensive $ 200 or so..and come in so many modeks..you need to find the exact number of your modual even though you give your vehicle model they vary greatly due to vehicle options...without it your four wheel will not engage....garage cost will be approx $ 400++ so try and find it..Good luck..
SOURCE: 2001 Dodge Durango
Many times this type of issue is caused by the motor that changes the transfer from 2 to 4 wheel drive, they get stuck, another issue is dirty fluid, have you had the transfwer case serviced?
SOURCE: 4 Wheel Drive Does Not Engage
transfer case or front diff to check put transfer case into 4x4 go under the truck and move the front drive shaft it should go in if working. Hope this helps.
SOURCE: 2001 Dodge Durango stuck in 4 wheel-Low. Won't switch back to 2WD
Just to clarify, the "transmission" is not stuck in 4-Lo. It is the "transfer case" that is attached to the transmission that actually engages the 4-Hi and 4-Lo modes. To properly shift your vehicle into 4-Lo, you know that you have to shift the transmission into neutral and slow down to less than 5 mph. Once your vehicle slows down to this range, your can switch your transfer case into 4-Lo mode. Due to the inner workings of the transfer case, the actual shift into 4-Lo may take a few seconds to complete. This is normal and does not signify that there is an issue. All transfer cases that have 4-Lo mode will act this way regardless of the make or model. To make a long story short, to shift out of 4-Lo you must follow the same steps that you took to shift into 4-Lo, just in reverse order. Switch the transfer case to 4-Lo mode if it isn't already there. Slow down to less than 5 mph (your vehicle must be moving, though). Then, shift your car into 4-Hi or 2WD. Give your vehicle several seconds to complete the shift. The transfer case indicator light will flash until it is complete. When it does complete the shift into the new gear mode, you will most likely hear a "clunk" (the range sleeve inside the transfer case disengages from its mating spline) from under your car. Again, any transfer case with 4-Lo (regardless of make or model) will exhibit this same noise. This should help you get out of 4-Lo. It is good practice to shift your car into and out of 4-Lo at least a few times each year to keep all of the splines free of corrosion and build-up. Based on the age of your vehicle, your transfer case may also need a complete flush and some new transmission fluid. Hope this helps.
SOURCE: 2001 Dodge Durango 4 wheel Drive doesnt work
i had same problem for almost 6 weeks . I just replaced my batty and it fixed the problem compleatly
SOURCE: my 2005 durango engages the 4 wheel drive by
This issue has reared its ugly head more than once on the Gen 1 and Gen 2 Durangos. Sometimes a simple battery disconnect /reset can cure the issue.
Other times, the TCCM or Transfer Case Control Module was at fault and needed to be replaced.
If you are fortunate enough to be still under the 7/70 powertrain warranty, the dealer will replace the TCCM for the $100 deductible.
Otherwise, it can cost in the region of $400.
Don
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