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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 29570
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2004 GMC yukon, service 4wd light comes on just about every

Customer Question

2004 GMC yukon, service 4wd light comes on just about every time i drive it, checked all fluids and they are fine. what 's the next troubleshooting step ? FYI I'm an aircraft mechanic so i am competant with tools etc.
Submitted: 8 years ago.
Category: GM
Expert:  GM Tech (Cam) replied 8 years ago.
Welcome. There are 2 common issues on these systems. First is the soldering for the terminals in the dash switch, the second is a failed encoder sensor in the shifter of the transfer case. The switch you can open up, loot at the back of the board where the pins attach. If you are good with a soldering in, resolder them. If this is the sensor, HERE are instructions and part numbers. Getting codes from the system would be best, XXXXX XXXXX the switch and c0327 is the sensor.