Skip the auto shop - Our mechanics make house calls

Q: Truck not going into four-wheel drive

asked by on

My truck will not go into four-wheel drive. The switch is not coming on.

A: There are several things that can go wrong ...

There are several things that can go wrong with the system on a Blazer. The switch is a part of the system and can possibly not be making good contact. There is a motor on the transfer case that engages the 4 wheel drive that can also fail. This is not very common but it does happen. Lastly the electronic actuator in the differential can also fail, causing it not to go into 4 wheel drive. The actuator is what locks the front differential when you activate the 4x4. Actuator failure is quite common. I suggest seeking help from a qualified mechanic to help you with this issue.

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: Oil pressure dropping

I hate to be the bearer of bad news, but it sounds like your engine is at about the end of its useful life. If a motor seizes, the piston has become so hot and expanded that its stuck in...

Q: Where is the speed sensor located and how to replace it

Hello, the speed sensor for the speedometer is located on the transmission at the rear extension housing. The housing is the part that the driveshaft slip yoke (front part of driveshaft) would be position at. The sensor is attached with...

Q: oil pressure drops,replaced oil pump, ran for a 2 months, and again pressure drops after afew minutes.

Engine oil pressure may go lower after an engine gets warm. You should have the oil pressure checked with a gauge tester to verify the oil pressure is within specification. If it falls to below specification, then you should replace...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.