Q: My 2000 blazer switches itself into 4x4 while driving along and then will not disengage

asked by on

I have a 2000 Chevy Blazer and after using the 4 wheel drive for the first time in a while now it switches by itself driving at any speed down the road without being touched and was it engages will not disengage back to too high

Your Blazer has a vacuum switch inside the transfer case that can fail which can cause the vacuum to leak pass the seals in the switch which will apply vacuum to the front axle actuator. When this happens, the front axle becomes locked to the front differential which is what essentially puts your car into 4x4. The part is relatively cheap to replace, however, the job itself can be quite complicated. I would recommend having an expert from YourMechanic come to your location to inspect the system in order to verify the problem and guide you with the repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. My 2000 blazer switches itself into 4x4 while driving along and then will not disengage

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: Trouble code P0101

Hello. P0101 is the trouble code for a problem with the mass airflow sensor and or circuit. This code is thrown when the computer detects an issue with the signal of the MAF sensor. The MAF sensor is one of...

Q: I HAVE A 2009 SRX V6

Between the drive shaft and the yoke into the differential is a u-joint. Based on your description that joint may be faulty and in need of replacement. To have that component inspected, and replaced if necessary, please request universal joint...

Q: Tranfer case keeps cracking

Hello. This is a very common problem with this design transfer cases of these years of Dodge vehicles. This is a design flaw that was fixed in newer versions of the transfer case. You can find many forums and complaints...

Related articles

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...
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.
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.