Skip the auto shop - Our mechanics make house calls

Q: switching into 4hi from 2hi by itself

asked by on

I can be driving down the highway and my truck will switch from 2hi into 4hi and there are times that it will do it when turning and it can make it really hard to turn at times. I can put it into 2hi again and it willbe fine till it pops into 4hi.

My car has 101111 miles.
My car has an automatic transmission.

A: Your vehicle uses an electric transfer case...

Your vehicle uses an electric transfer case motor to switch from 2WD to 4WD, and that motor or the associated wiring may be failing and switching itself over bumps. I would begin by checking the wiring and connectors to the motor, as well as checking the motor itself. Try starting the car and tapping on the motor with a screwdriver, and moving all the wiring to see if you can get it to shift on its own. It’s also possible that it has a failed switch. I would recommend having a qualified professional, such as one from YourMechanic, diagnose the electric transfer case for 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: Truck stop's pulling going down highway stop put in 4wd and back to 2wd it starts back pulling

Many drivers with your same truck have had issues with the transfer case encoder motor. There will be a diagnostic trouble code (DTC) that can be retrieved with a scan tool to indicate a problem in this system. There is...

Q: Why would there be smoke coming from under my hood and now my car does not shift 2001 Honda Civic

Hello. This can be caused by a number of things. The first thing that needs to be determined is where the smoke is coming from. That may be directly related to the shifting if it is due to leaking transmission...

Q: My check engine light is on

A vehicle that has a problem with the engine or power train can turn on the check engine light and set a code in the computer. The list of possible codes and problems are in the hundreds. You will need...

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...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...