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Service 4wheel light - 2003 GMC Sierra 2500HD

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POSSIBLE 4WD CONTROL MODULE. MODULE MAY HAVE TO BE PROGRAMED

Posted on Dec 30, 2010

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Four whell drive service light comes on


service the 4x4 change swith on the transfer case

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No light on 4wheel dr control


There are a few things that would cause this problem.
The first and most common would be the switch itself is bad. the next would be a bad 4wheel drive encoder motor, this is the motor on the transfer case that is used to operate the 4wheel drive. The last would be the 4 wheel drive module.
You will need to do some testing, if the four wheel drive is working and goes in and out of 4 wheel drive then i would say it the switch. if it does not work correctly it may still be the switch or one of the components i listed above.I have enclosed a wiring diagram, you will need to do some testing to check system, first make sure all fuses are good. the fuses that operate the 4wd are listed on diagram, it will also tell you the location of each part. you will need to test front axle actuator and selector motor and switch, you will need a test light and a meter. hope this is helpful, good day.4_26_2012_10_13_14_pm.gif

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I have a 2002 Trailblazer. The 4wheel drive service light is on what should I do? The 4wheel drive isn't working at all. Can I continue to drive in 2 wheel High until I get to dealer?


Your fine to drive it on 2wd till you make it to the dealer, but in the mean time check your 4wd fuse. The 4X4 encoder motor is know to blow fuses in cold days and it's a simple fix by replacing a fuse for 35 cent then having a dealer replace it for $65.00 service charge. Good luck and hope ti's a simple fuse that has gone bad, there common to go bad when 4wd is engaged during cold operation.

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How to reset Service 4wheel drive warning light on 2005 ChevTahoe


I have a 2005 Tahoe that recently had a similar problem. To resolve, I did the following.
  1. Change the transfer case fluid (Which you already did)
  2. Change Gears to 4L while in neutral, change back to drive, and drive slowly 50 yards or so.
  3. Change Gears to 4H while in neutral, change back to drive, and drive slowly 50 yards or so.
  4. Change Gears to 2H while in neutral, change back to drive, and drive normally for a couple of miles.
This will cycle the fluid within your transfer case, and hopefully clean out the sensor. I did this, and my Service 4WD light went away after one day of normal driving. Hope this helps. Note: When I went into 4L the first go around, it had a hard time shifting due to non use. I changed between 4H and 4L a few times until it got smoother.

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1 Answer

4wheel drive service light comes on


its a possibility that the transfer case might be going out or the fluids in it are bad sometimes after alot of mileage the tranfer case will slip or stick

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