I recently had some work done on my 99 Yukon my 4wd light stays on continuously while the truck is running but the truck is in 2wd and has not been changed I did not have this problem until I had a mechanic do some work for me than I started having this problem could this mechanic have disconnected a wire or something could this be the case
Take it back to the shop who did the work an have them check it .
SOURCE: My yukon will start but won't stay running. When
Check air filter, maybe clogged. Check leaks of vacuum on the intake manifold, maybe a broken hose.
SOURCE: The 4wd is not working on my 2003 gmc yukon,
Does the truck have a push button selector on the dash? If so, you need to replace the drive motor on the transfur case.
SOURCE: I have a 2005 GMC Yukon XL. The service 4WD is on.
Yes you do have to take it to the dealer, This is a common problem in these trucks. This is caused by a bad encoder sensor in the shifter on the side of the transfer case. The sensor can be replaced with out having to replace the shifter assembly.
THe best test is to get the code from the system. This sensor is a sliding resistor and the material wears off causing a false reading. That is why the lights were showing Nothing, but you were able to drive. The code for the sensor is C0327.
TBS: #PIP3480M: Rattle Drone Or Buffeting Noise At Highway Speed In 2WD Or DTC C0327 - keywords 246 2hi 2high 4WD auto awd buffet buzz case click indicator knock lamp light service tick transfercase transfer vibrati - (Mar 4, 2008) Vehicles involved were built approximately between 01/01/04 and 03/06/06. The noise condition if not noticed by the customer may cause eventual encoder sensor wear causing DTC C0327 set in the Transfer Case Control Module (TCCM).
An updated TCCM calibration has been released to apply light pressure to the transfer case clutch pack and reduce the rattle. The calibration was released on 3/18/07 and the title line will read "to correct transfer case rattle at highway speeds and possible DTC C0327". For Rattle only (no current DTC C0327 set), Install the updated calibration and if necessary follow the diagnostics listed below
If the vehicle has a current or history dtc C0327 and can be diagnosed to the encoder sensor, re-flash with the updated calibrations and replace the encoder sensor as necessary.
Important Note: All NV246 transfer cases built 02/25/06 and beyond are manufactured with pressed fit parts to help reduce the rattle. Inspect the ID tag on the transfer case for this build date and verify the tccm has the latest calibration before repairs are initiated.
Thank you fur using Fixya and good luck.
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SOURCE: 2005 GMC Yukon XL-
It is probably the encoder motor attached to the transfere case. look under the vehicle to see if there is signs of corrosion between the encoder motor and transfere case.
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