Skip the auto shop - Our mechanics make house calls

Q: 4x4 not working. Replaced transfer case motor, control module, and tested the 4WD switch. Everything is good.

asked by on

Will not shift into 4x4

My car has 12000 miles.
My car has an automatic transmission.

Hi there. The synchronizer or fork inside the transfer case may be damaged causing the transfer case to not engage the front axle. Try to put the transfer case in 4 HI and see if the vehicle is engaging. If not, try to put the transfer case in 4 LOW and see if the vehicle will only travel at a low speed. If so, jack up the vehicle and have all 4 wheels off the ground. If the front driveshaft turns when the 4WD is engaged, then there is a problem with the front axle. If the 4WD is engaged and the front driveshaft is not turning, then there is a problem with the transfer case. If you need further assistance with your 4WD unit, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • 4x4 not working. Replaced transfer case motor, control module, and tested the 4WD switch. Everything is good.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I have white/bluish smoke coming out of the exhaust occasionally. I have no power loss and it happens infrequently.

I suggest you study the smoke and try to recognize a pattern. It might mean that you have to spend a lot of time looking in the mirror, so try not to be unsafe. If you are having a problem...

Q: Where is the starter located on a 2006 lr3 4.0 liter?

Hi there. The starter is located on the back of the engine on the driver side attached just in front of the transmission bell housing. You may have to remove the exhaust manifold to get to the starter. If you...

Q: How hard is it to switch an nv 4500 transmission from 2 wheel drive to 4 wheel drive in a Chevrolet.

Hi there. There are a couple of ways to convert your transmission from 2WD to 4WD. You could install a transfer case and have a short drive shaft go to it from the transmission. Another was is you will need...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...