I believe this is a reminder set in the computer and would have to be reset by a dealer or mechanic. I have the same thing happen in my 04 Suburban.
SOURCE: Service 4WD error displays on 2004 Yukon XL with 37,000 miles.
Most common problem is a code for the encoder motor position sensor.
You will not be able to pull a code unless you can communicate with the Transfer case control module, the codes ARE NOT stored in the PCM.
Sensor is about 80 bucks and takes about 2 hours to install (on your back) about 30 min, if you have a lift.
Just a side not, if the light came on. There is a code somewhere
SOURCE: Where do I find the color code for 2003 GMC Yukon
its in the vin number in the windsheald and your registration. if you call a gmc dealer and give them your vin# they will tell you what letter or number it is and what the name is.
SOURCE: 2002 GMC YUKON XL 1500 MOTOR DIES AFTER GOING
Check the fuel cap!! If the vacuum relief is not working it can impede the fuel flow and cause the engine to shut down or not restart after a stop. Waiting usually gives things a chance to stabalize and the engine will restsrt. When this happens again try loosening the cap and see if the engine will restart.....If it restarts immediately, REPLACE the fuel cap..Do Not leave it loose because this will cause other problems. If it is not the fuel cap the problem may be the filter, the fuel pump, or aome other fuel system malfunction.
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SOURCE: GMC Yukon XL is stuck in auto 4wd. Service 4wd
First get the codes from the transfer case control module.This will help in diagnosing the problem.You can try pushing the 2hi and 4lo buttons simultaneously for 10 seconds.This should put the transfer case in neutral. Then try going to 2 hi.See if this will get it out of 4wd.Let me know what you find.If you need more help let me know Good luck.
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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