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.
Car Problem Reports
Chevrolet Tahoe 4WD Transfer Case Position Sensor/Selector Switch May Fail
Chevrolet Tahoe Problem
52 Reports
Model Years Affected: 2000, 2001, 2002, 2003, 2004, 2005, 2006
Drive Train Affected: 4WD
Average Mileage: 107,038 mi (14,200 mi - 240,000 mi)
Verified
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Visitor, 2004 Chevrolet Tahoe, 4WD, 111,000 mi
Same issue! The tahoe just goes into 4WD on random times. UG!
Flag ThisLike | 15 people like this15 -
devildogae, 2001 Chevrolet Tahoe, 4WD, 153,000 miRookie
4 wheel drive service light will come on after switching to 4 high. Selector swith will fail and is stuck in 4 high. I have to turn the engine off then back on to select 2 high. Dealer cannot find a problem...lol
Flag ThisLike | 15 people like this15 -
Visitor, 2004 Chevrolet Tahoe, 4WD, 124,000 mi
Z71 Tahoe transfer case makes noise when going down the road. Vehicle jumped while at stoplight, like someone bumped into me. Lifted rear axle,put into 2wd ,while tires start to turn loud noise coming from transfer case and klunking sounds. I do not use 4wd !!! This is the only problem I`ve ever had with my Chevy and if continues I will never buy any 4wd vehicle again! I really love this Z71 Tahoe.(I traded my `03 Excursion 4wd diesel for this?) Dashboard says service 4wd.Just driving in 2wd all tne time and having problems with 4wd doesn`t make sense.
Flag ThisLike | 9 people like this9 -
Visitor, 2005 Chevrolet Tahoe, 4WD, 65,000 mi
Service 4WD message and stability traction control off message
Flag ThisLike | 7 people like this7 -
Visitor, 2003 Chevrolet Tahoe, 4WD
service 4 wd warning comes on and 4wd will shift by itself into 4w low from 2w high. and sometimes now both 2 hi and 4 lo stay lit at same time.
Flag ThisLike | 6 people like this6 -
Visitor, 2005 Chevrolet Tahoe, 4WD, 67,000 mi
Service 4WD and system stability disabled light come on. Currently working on a solution.
Flag ThisLike | 5 people like this5 -
hrdir, 2004 Chevrolet Tahoe, 4WD, 85,376 miRookie
servive 4wd light comin on..mechanic having trouble resetting switch..may be motor problem...
Flag ThisLike | 5 people like this5 -
Visitor, 2005 Chevrolet Tahoe, 4WD, 85,000 mi
Dealership in Chapel Hill NC tried to convince me I needed an entirely new transfer case. Not the case at all, just the encoder switch worn out.
Flag ThisLike | 4 people like this4 -
fun2luvlv, 2004 Chevrolet Tahoe, 4WD, 119,000 miRookie
My 4WD/2WD push button selector switch won't light up most of the time and when it does it won't come out of 4LO. Service 4WD light is on. My mechanic ran diagnostic and couldn't find anything wrong. Obviously there is something wrong as it still says service 4WD.
Flag ThisLike | 3 people like this3 -
Visitor, 2005 Chevrolet Tahoe, 4WD, 80,000 mi
TRACTION CONTROL DISABLED IS ON, RANDOM IN 4WD AFTER STARTING, WILL NOT GO INTO 4 LO OR ANYTHING, NO LIGHT AT THE PUSH BUTTONS. HELP!
Flag ThisLike | 3 people like this3