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.
Service 4WD Message May be Displayed on Chevrolet Tahoe
Average mileage: 126,011 (2,060–250,000)
Drive Train affected: 4WD
203 people reported this problem
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.
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
2004 Chevrolet Tahoe - 4WD 124,000 mi, Visitor
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.
2005 Chevrolet Tahoe - 4WD 80,000 mi, Visitor
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!
2006 Chevrolet Tahoe - 4WD 150,000 mi, Visitor
trasfer case will not switch into 4wd drive and I replaced the transfer case motor and now the car won't go into gear or show 2wd on the switch. It grinds when I go to put it in park and won't move. service 4wd light and stability control disabled light as well as TPMS light comes on.
2004 Chevrolet Tahoe - 4WD 111,000 mi, Visitor
Same issue! The tahoe just goes into 4WD on random times. UG!
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.
2004 Chevrolet Tahoe - 4WD 120,000 mi, Visitor
I have 4wd Tahoe switch is stock on 4hi and ,if i press 2h light is blinking service 4wd massage comes on and goes back to 4hi ,change the switch but didn't help .
2004 Chevrolet Tahoe - 4WD 107,000 mi, Visitor
will not go in to 4x4 an half the time none of the push buttons work on the switch most of the time it stays in 2 wheel drive but some times goes into 4x4 by its self an hard to get out of it. have not found probelum yet
2005 Chevrolet Tahoe - 4WD 65,000 mi, Visitor
Service 4WD message and stability traction control off message
2005 Chevrolet Tahoe - 4WD 85,000 mi, Visitor
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.
2005 Chevrolet Tahoe - 4WD 67,000 mi, Visitor
Service 4WD and system stability disabled light come on. Currently working on a solution.
2003 Chevrolet Tahoe - 4WD 110,000 mi, Visitor
The connections within the 4x4 selector switch on the dash go bad and cause the Servvice 4x4 light to come and occasionaly cause unwanted switches from 2wd to 4wd and vice versa....pick up a new switch...$50 and 10mins of install time and the problem is fixed
servive 4wd light comin on..mechanic having trouble resetting switch..may be motor problem...
2004 Chevrolet Tahoe - 4WD 101,024 mi, Visitor
Since 2008 I have replaced 4WD sensor three times and the actuator twice. If either one is bad it will cause your transfer case to try and shift into neutral while you are driving and once it is in neutral you have to pull off the road and turn the motor off and then select four wheel to get it into park and then back into two wheel drive. I have had it happen at 70 miles an hour with the cruise control on causing the engine to rev to maximum revolutions while trying to get off the freeway.
I had a similar problem with 4 wheel drive selector switch. When I select 4 wheel hi the transfer case moved into 4 wheel hi, but I later switched back to 2 wheel hi, the switch wouldn't always take place, or it would switch but the lights on the selector switch would turn off. It seems that this is a common problem due to a bad ground wire underneath the drivers seat on the main frame of the vehicle. There are two ground wires next to the emergency brake cable that need to be cleaned. As soon as I cleaned them my 4 wheel drive worked great again. Try cleaning these first, it's an easy no cost fix.
service 4wd and stabilitrack disabled displayed
2005 Chevrolet Tahoe 77,000 mi, Visitor
random switching into 4low and shutting off of switc all together.
2006 Chevrolet Tahoe - 4WD 118,000 mi, Visitor
I purchased a new 4wd switch from autozone and it fixed everything. I would try this before doing any expensive transfer case work! hope this helps someone!
2000 Chevrolet Tahoe - 4WD 90,000 mi, Visitor
Service 4wd warning message displays all of the time. 4WD has not been used. Sometime after warning began, tried to set into 4wd mode and does not seem to actuate the front drive axel. Dealership found no problem and claimed to have reset the "system". Warning continues. NOTE: instrument cluster has been replaced under manufacturers recall before this has happened. No solution has yet been found.