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.

Be Social With Us !

FacebookGoogle Bookmarks


Leave your comments

Post comment as a guest

0 / 300 Character restriction
Your text should be in between 10-300 characters

    Comments (3)

      • 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?

      • 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.

      • Tech

        In reply to: 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.

      Search Us Here...


      How Things Work

      Evaporative Emission System Operation and Components

      The Evaporative Emission (EVAP) control system limits the fuel vapors from escaping into the atmosphere. The EVAP transfers the fuel vapors from the sealed fuel tank to an activated carbon (charcoal) storage device (EVAP canister). The EVAP canister stores the vapors until the engine is able to use the extra fuel vapor. When the engine is able to use the extra fuel vapor,

      Read more...

      Common Engine Codes

      Code P0101 or P0102 Mass Air flow Sensor

      The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The powertrain control module (PCM) uses the MAF sensor signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air entering the engine indicates deceleration or idle.

      Read more...