Last post on Aug 24, 2013 at 7:44 PM
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Chevrolet Tahoe, Chevrolet Tahoe Limited/Z71, Chevrolet Suburban, SUV
#75 of 120 Service 4WD message
Nov 24, 2010 (7:47 am)
I was driving on snowpacked roads and needed to drive up a steep hill. I tried to transfer from 2wd into 4wd (hi) but the switch over didn't happen. My 2001 Tahoe stayed in 2wd and the message center signaled a Service 4WD message. I drove home in 2wd. The buttons on the panel that allows you to switch from 2wd to 4wd (hi) or even 4wd (lo) didn't work from the moment I received the message for Service 4WD. I switched the fuse for the 4wd (15 amp) and nothing happened. I then opened the hood and replaced the ATC (20 am) fuse and the problems was fixed. Just wanted to leave a note that might help someone else who may run into the same problem. Test drive was successful.
#76 of 120 4x4 disengage and engagement issues resolution
Dec 02, 2010 (11:22 am)
I can save you a lot of time tinkering with 4wd problems. I did it for years on 2003 chevy tahoe 5.3 Z engine. Replaced front actuator (dont use the gas piston get the non-gas model), 4x4 switch on dash and transmission motor switch. The transmission motor switch was the item that was last and resolved all my problems. I had service 4x4 being displayed, 1.5 minutes to switch from 2wd to 4wd, 1.5 hours to switch from 4x4 to 2wd. Warranty never would fix it because I could not replicate the problems in front of them. Imagine car posts serverice 4x4 but technician has no idea what to do (5 dealerships visited) No MIL codes or transmission codes eventhough the service 4x4 light would come on. GM home office service calls were useless.
#77 of 120 Re: 4x4 disengage and engagement issues resolution [mechanic12]
Dec 04, 2010 (6:54 pm)
I am having the same "service 4 wd" light on the display. 2004 Tahoe Z71. did you replace the transmission motor switch yourself or did GM do it? If yourself, is it simple enough to do? Where did you get the part. can you please give me some pointers on replacement.
#78 of 120 Re: 4x4 disengage and engagement issues resolution [kingdvb]
Dec 06, 2010 (11:44 am)
I changed the actuator switch on the front differential and had a 4 wheel drive mechanic change the transmission motor switch. I bought the actuator from "http://www.dormanproducts.com/applicationguideresults.aspx?y=2003&mk=CHEVROLET+- TRUCK&md=TAHOE&e=V8+-+5.3L+(323+CID)%3a+FLEX%3a+FI%3a+N%3a+Z&c=4&cn=4WD+AXLE+ACT- UATOR" and my mechanic bought the switch. The advantage of dorman actuator is that it is not the gas controlled piston which is cold temperature sensitive. There are tricks to install the transmission switch so I would not recommend doing it by yourself since you can seriously kill your transmission. Good luck! It is well worth the money for the two components.
#79 of 120 98 Tahoe 4WD Lights
Dec 06, 2010 (1:56 pm)
The 4wd / 2wd dash lights on my 98 Tahoe are not working properly. I pulled the fuse and reset the code and this worked for a few starts before they failed again. If I press on the 2wd button when I first start, it will nornally engage, but it won't stay set (it may fail while driving, or on the next start). When the lights do work, I can hear the shift into 4wlo. Any suggestions on where to start would be greatly appreciated.
#80 of 120 Re: Taho 4 WD 1998
Dec 07, 2010 (11:00 am)
Just for the record... the Transfer Case Fuse on a 1998 Tahoe with the push button 4-wheel drive is in a little door on the side of the dash (open the drivers door and look at the dash). The fuse is marked "T Case".
My story, just in case your interested:
Had the oxygen sensors replaced and, two days later going down the freeway... rip, thud, thud, thud, rip, bam! and rolled to a stop. The sensor wiring harness was wound around the front drive shaft. Along with the sensor harness was the transmission wiring harness as well as the transmission linkage. Also ripped out the linkage bracket.
After a week in the shop 300 miles from home, the harnesses, linkage and bracket were replaced with a mixture of new and scrapyard parts. No... I didn't pay $2300 for a new transmission harness... lol.
When I picked it up after turning in the rental, I found that the 4 wheel drive did not work. Lights on the indicators worked somewhat and, when anything was pushed, "neutral" illuminated... but no response down below. Drove home in 2 wheel thinking I'd work on it more later. Yes, I could have held the shop responsible for missing it but, frankly, I'd had enough for the time being. Remember... 300 miles from home.
Kudos to this forum. May I say again... KUDOS TO THIS FORUM AND ALL WHO POST! Finally found the 20 amp T Case fuse, replaced it (it was blown, of course) and as nikt said, even though the keys were nowhere near the ignition, I heard the click of the transfer case. Started it up and all is well!
#81 of 120 Re: 98 Tahoe 4WD Lights [mn_dan]
Dec 07, 2010 (11:27 am)
Please look at this post: 4x4 disengage and engagement issues resolution [kingdvb] by mechanic12 Dec 06, 2010 (11:44 am) I would be very concerned driving your car. It has been reported the transmission automatically shifting from 2wd to 4wd on its own. If this happens at over 45 mph this could cause tremendous problems. My undeducated guess is the transmission case motor switch is not sure what mode it is in (4x4low, 4x4high or 2wd). I would replace the front actuator and the transmission motor switch. Since I have done this I have not had a single problem with my 4 wheel drive. I hunt almost every weekend so I use my 4 wheel drive frequently.
#82 of 120 front axels wont engage
Dec 11, 2010 (9:06 am)
i have a 94 chevy suburban with a 454 big block and i can tell that the 4wd is engaging at transfer case but the front axels are not locking in
thanks for any help
Jan 11, 2011 (5:38 pm)
i have a 95 4dr 4x4 tahoe 5.7l i have a 300 hp rated transmission with a level shift kit from monster transmissions. i have checked actuator and t case. i have the floor shifter. tcase engages u can hear it click. i bought a new actuator but it didnt make a difference. so i made sure the old one worked n took the new one back n got my 80 bucks back. i have got my dad to drive it while i held the front driveshaft to see it it was turning in 4 wheel it was so im thinking its in the hub or it might be the thing in front of the actuator. any suggestions please. i have replaced every brake line and hose caliper to wheel cylinder, master cylinder. radiator blew out when i hooked the tranny up blew the sides out of it lmao this truck will be all new b4 long.