2004 Truck. Engine Size : 5.7 liter Question: 4x4 not working . Does not switch over when I try to engage it.

It would help if you mentioned the make and model of your vehicle, and if you have electronic 4WD, or have to shift it into 4WD manually. If it's electronic, you could have a bad switch, or a bad actuator on the front axle. Either electronic or manual, you could have a mechanical failure inside the front axle housing that is causing it not to engage into 4WD, like broken gears or axles, mis-aligned parts, etc. If the problem is with the transfer case, you could have a bad encoder motor or a mechanical failure inside the transfer case. On the electronically controlled systems, there is a main control module that could be bad as well. You're best bet is to get it to a shop for diagnosis.


Leave your comments

Post comment as a guest

0

    Comments (9)
    Subscribe To These Comments-----   

    • Guest - carl

      I have a 1993 chevy truck k2500 5.7L automatic 4x4. My 4wd works only in 4wd high but for some reason does not work in 4wd Lo. Lights go on when shift into 4wd Lo but does not engage.

    • Guest - kevin

      why a 1997 gmc yukon wont go in 4 wheel drive dont work in high

    • Guest - Paul Peck

      4wd not working, and 4x4 light won't come on

    • Guest - erick

      2001 chev4 weal drive wont ingage lite blinks

    • Guest - james

      2006 chevy Silverado 4x4 when I push button to go into 4 wheel drive the button blinks and goes back to 4 wheel auto..does not go into 4 wheel drive

    • Guest - Stan

      In reply to: Guest - james

      This sounds like either the 4wd computer is bad, or the actuator on the transfer case went. You would need to have the 4wd computer scanned for codes.

    • Guest - Ira

      I have a 1992 GMC Sierra 4x4 that won't go into 4x4. There seems to be no power going to the front axel actuator. The actuator does work, tested ok. How can I test the switch on the transfer case?

    • Guest - dave

      I have a 2005 GMC Sierra 1500 Z71 with electronic 4wd. When I press 4w high, the light selector works and goes to high, but the 4wd is not engaged (the front tires do not spin)? I checked the fuse and its good. Any ideas? I hear a slight electrical noise when I go to high and a clunk when I go to low but it doesn't engage.

    • Guest - Tech

      In reply to: Guest - dave

      Since you hear it tying to engage, then you could have a bad encoder motor. This is on the transfercase and is what changes gears, or an internal problem in the case that does not allow it to change.

    Latest Articles

    Chevrolet Blazer Lost Power ...

    2000 blazer 4x4 lost power to drivetrain going down the ...

    Dodge Durango Timing Chain ...

    My 03 Dodge Durango 4.7L engine was blowing white smoke ...

    2002 Chevy Blazer Keeps ...

    My 2002 blazer keeps dying on me when I am driving, and ...

    1996 Lumina Dies Looses ...

    1996 Chevy Lumina 3.1 L. I have good fuel pressure,spark ...

    Silverado Won't Start Cold

    My 1992 Silverado 6 cylinder turns over but will not run if ...

    How Things Work

    Brakes- Hydraulic System- How Does It Work

    The hydraulic brake system consists of the following:

    Hydraulic Brake Master Cylinder Fluid Reservoir: Contains supply of brake fluid for the hydraulic brake system.

    Hydraulic Brake Master Cylinder: Converts mechanical input force into hydraulic output pressure. Hydraulic output pressure is distributed from the master cylinder

    Read more...

    Common Engine Codes

    Oxygen Sensor Code P0130 - P0141

    The powertrain control module (PCM) supplies a bias voltage of about 450 mV between the heated oxygen sensor (HO2S) high signal circuit and the HO2S low reference circuit. When measured with a 10 mega ohm digital voltmeter, this may display as low as 350 mV. The oxygen sensor signal varies from about 800 mV when the exhaust is rich, to about 50 mV when the exhaust is lean.

    Read more...