GMC Sierra 1500
Report: 4WD Transfer Case Position Sensor/Selector Switch May Fail
GMC Sierra 1500 Problem
Drive Trains Affected: 4WD, Automatic Transmission
Average Mileage: 116,925 mi (29,000 mi - 235,000 mi)
The 4WD transfer case encoder motor position sensor or the selector switch may fail causing the service 4WD message to be displayed. Fault code(s) stored in the transfer case control module will be of assistance in determining the exact fault causing the message to be displayed.
Visitor, 2005 GMC Sierra 1500, 4WD, 69,000 mi
Transmission selector button lights on upper left dash are not responding properly. Truck may be in 2WD but indicator lights show 4WD Lo. Sometimes truck will be in 2WD and the indicator light will show neutral or will not light up at all. Sometimes when 4WD Lo is illuminated, the truck feels like it is in overdrive. The first time this happened, a friend told me to disconnect the battery for an hour or so and the problem would resolve itself. It did... 9 months later it is doing it again and the battery disconnect trick no longer works. I am headed to the Dealer tomorrow. Wish me luck!
you can hear the transfer case kickin in, but the front wont lock in. replace the actuator and the switch on the dash and still doesnt work.
Visitor, 2002 GMC Sierra 1500, 4WD, 235,000 mi
attempted to change into 4 wheel drive low and the front wheels did not lock, lights on push buttons went out also. returned to street and when I try to drive off the vehicle goes into 4 wheel low. no indication from the buttons what gear it is in. no response from pushing any of the buttons.
my service 4wd light came on and i thought i was screwed. the last thing i wanted to do was , take it in and have them tell me i needed $5,000 worth of repairs,.
i looked it up on the internet and it said check the soildering connections on the back of the switch . it said they sometimes werent done correctly and become loose.
and wouldnt u know it , that was the problem . light has never came on since . THANK GOD !!!!!!!!
Visitor, 2005 GMC Sierra 1500, 4WD, 103,000 mi
service 4wd indicator came on after trouble trying to engage 4wd. 2wd light lit but will not switch to anything else. switch unresponsive
Visitor, 2003 GMC Sierra 1500, 4WD, 125,000 mi
No lights on the selector switch. 4WD wont engage.
Visitor, 2005 GMC Sierra 1500, 4WD, 100,000 mi
This indicator has been on for a few years - I have ignored it because I don't use my four-wheel drive. If I want to put it into 4wd, I put the transmission in neutral before the indicator comes on, push 4wd high or low button, it clunks, I drive around the parking lot, put it back into 2wd and the sensor won't go on again for a few months.
Visitor, 2005 GMC Sierra 1500, 4WD, 29,000 mi
I had a "Service 4WD" msg pop up out of no where. Looks like it might be the switch based on what I'm reading out here. Wow...quality job #29. What a disappointment! Maybe I'll sell mine & start shopping for a Ford.
Visitor, 2006 GMC Sierra 1500, 4WD
4 wd light turned on all of a sudden
Visitor, 2004 GMC Sierra 1500, 4WD, 107,000 mi
Service 4wd light came on. I ignored it for two days and then my 2wd light disapeared and it wouldn't stay in 2wd. I was scared to take it to a dealer and be ripped off, but I was also scared to take it to someone that really didn't know what they were doing and not get the problem fixed properly (especially with it possibly being a transmission issue). I decided to give the dealer here a chance- it was the encoder motor (they looked at the switch first)- $340.41 out the door and they took really good care of me. I think they did a great job and I don't feel like they ripped me off. I do not have the time or the knowledge to replace it myself, and besides this is now warranted by a dealer.