Question about 2003 GMC Sierra

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Got in truck wouldnt go into 4wd said service 4wd shut truck off then everything worked fine

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Has it been some time since 4X4 was engaged? Have you had the fluid changed in the tranfer case? it should be done at 60,000 miles, worn out lubricant can cause these kinds of problems with transfer cases.

Posted on Dec 03, 2008

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1998 Chevy Suburban - service 4wd light comes on after running 4x4 for 2 mins


Well it could be the selector switch, but I doubt it.
Generally, the service light means something is not working that the computer controls. Solenoids and valves are a couple of possibilities.
The transfer case is shifted by solenoids commanded by the body computer based on the switch position on the dash.
You should be able to have a shop scan the body computer for trouble codes and proceed from there.
A basic code reader may not access the body computer.

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check the 4wd switch on the transfercase and wiring sounds like its shorting out. Fuses only blow when theres a short

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If everything is working fine, then yes, it seems to be the sensor/sending unit. Check all connections first prior to replacement.

Good luck!

Feb 04, 2010 | 2004 GMC Sierra

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Service 4wd light is coming on but 4wd works fine


i had the same problem in my 99,i replaced the switch assembly on the dash and all is well,hope this helps

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have you checked to ensure that the actuator is working? if the actuator isn't working then the ring gear wont engage and won't turn the front shafts. try turning your key to accessory and put the truck in 4wd

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sometimes a fuse might be going bad.....thus leading to lights turning on...i wouldnt pay too muc attention to the light unless it comes on more frequently or stays on. if so definitly get it checked out.

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1 Answer

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you need to get an obd2 code reader so you can clear the code.

Jan 22, 2009 | 2005 GMC Yukon

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