Skip the auto shop - Our mechanics make house calls

Q: My 4x4 system stopped working.

asked by on

My 4x4 system stopped working. I have had it in a shop for a few weeks but still nothing. I have replaced the motor on the transfer case, the control switch, fuses, relays, and the gem module. I can't afford to pay for the mechanics to keep trying this and that. What could it be and how do I correct it ?

My car has 160000 miles.
My car has an automatic transmission.

Hi there. First, put the vehicle on 4 jack stands with all tires off the ground. Then, start the engine and put the transfer case in 4 HI. Then put the transmission in Low. Watch the tires and drive shafts to see what is moving. If the front drive shaft is not moving, then either the chain in the transfer case is broken or the fork is misaligned. If the front drive shaft is turning, then the front axle engagement switch has failed and is not working. If your see the wheels trying to turn but you hear a grinding sound, then the front hubs are ground out and need replaced. Shut off the engine and when the vehicle is off, put the transmission in park after the wheels have stopped and lower the vehicle after diagnosing your problem. If you need further assistance with your 4WD not working, 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!

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: The a/c cycles between vent, then defrost, then floor, then back to vent in my 1989 ford f150 v8 5.0

I am not sure that these two issues are related. The radiator leak is most likely a separate issue from the air flow issue. Since the radiator has been fixed I will address the air flow issue. It is likely...

Q: 4WD is stuck in low range - 2001 Toyota Land Cruiser

Hi there, your 4WD problem is likely caused by bad linkage to the transfer case, or a bad transfer case shift actuator. Unfortunately, this is not a repair YourMechanic is able to offer at this time. Check with a local...

Q: It's in drive but won't budge, only moves forward in Drive3 2002 Ford Explorer

Hi - most likely the overdrive sprag (a one-way clutch) in the transmission is slipping, and must be replaced. It must work properly for any forward gear to work. I would recommend a transmission inspection by a mobile, professional mechanic,...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.