GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 9 of 9
  1. #1

    Default 2005 silverado service 4wd message

    Hi guys, I have a 2005 z71 and until now (172,000 miles) it's been a great truck besides a transmission rebuild at 100k and now the service 4wd message is on and won't go off, and none of my buttons on the left side are lit up. It started just doing it every now and then And now it's constantly on. I tried all the tricks I used on my two previous z71's (an 03' and a 99') but its not working, tried starting and restarting, disconnecting battery, all of the above, do y'all think it could be a bad connection or an actuator, if so how do I find out? My scanner is only picking up 02 sensor codes which is the least of my worries lol any input would be greatly appreciated bc without 4wd in my line of work I'm screwed

  2. #2

    Default

    Look into changing your transfer case motor you will need to know your vin code and its pretty simple its three bolts and a wiring clip, had the same problem on my 2004 silverado.

  3. #3
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
    Posts
    1,478

    Default

    what you need to do is have the GM drive train codes pulled with the scanner having this ability . then post what the code[s] are.

    it can be many things causing this. check fuses. It is not uncommon to have the small wires to the transfercase break. the feedback sensor in the encoder is also a problem. could also be the transfercase is stuck.

    codes will reveal the area of failure. you may have to go to the dealership of the local tranmissiom shop.

  4. #4

    Default

    I had this same message come up last weekend. I had backed up a steep, slick, grassy slope to load up while helping my son move out of his apartment. After spinning the rear wheels a little I switched to 4WD for a few feet. After loading up, I switched back to 2WD and noticed the message. I acknowledged it and it disappeared, hasn't come back - even though I had to duplicate the procedure again later that day.
    I continue to lie to myself because I'm the only one who still believes me. - Vermin

  5. #5
    Jr. Mechanic
    Join Date
    Nov 2011
    Location
    Central Illinois
    Posts
    130

    Default

    I agree with j cat. If you search the forum you will notice that the encoder is the culprit a lot of the time.

    Quote Originally Posted by j cat View Post
    what you need to do is have the GM drive train codes pulled with the scanner having this ability . then post what the code[s] are.

    it can be many things causing this. check fuses. It is not uncommon to have the small wires to the transfercase break. the feedback sensor in the encoder is also a problem. could also be the transfercase is stuck.

    codes will reveal the area of failure. you may have to go to the dealership of the local tranmissiom shop.
    2012 Silverado 1500 LT 4X4
    2003 Suburban LT 2500 6.0L
    2004 2500HD Crew Cab LT 4x4 6.0L - SOLD

  6. #6
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
    Posts
    1,478

    Default

    the encoder has feedback circuits that report the encoder position. if not correct you get a message. best check the fluid color make sure it is blue. if dark/grayish replace now to avoid any more damage.

    when switching into 4wd or out give the vehicle some time to complete operations before heavy loading up of the drivetrain.

  7. #7

    Default

    I would start by crawling under the truck and unplugging and reconnecting connectors on and around the transfercase. The same thing happened in my 03. I played with the connectors and the light went off and never returned. I do agree with everyone else though the encoder motor on them are a known issue. But, you might gert lucky and have a corroded connection

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  8. #8

    Default

    Sometimes the cause is as simple as the switch on the dash... I have the same problem, but never looked into it because until 2 weeks ago, it would only turn on randomly, and if I shut the truck off, and then back on, I was able to shift into / out of 4wd... But now I can only get it into Auto 4wd once in a while... So I gotta fix mine now too... Let me know what you come up with.
    00 Chevy Tahoe LT, 5.3 4x4

  9. #9
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
    Posts
    1,478

    Default

    those encoder signal wires are very small and break easy. I know of one case where an owner was too hard on the wire harness on the driverside fuse box when changing spark plugs . he broke a wire . that wire was the encoder brake wire.

Similar Threads

  1. Service 4wd message comes on when I turn on AC??
    By steelfoxdesign in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 08-11-2012, 05:45 PM
  2. Service 4WD Message
    By Six point in forum General Chevy & GM Tech Questions
    Replies: 4
    Last: 09-09-2011, 08:47 AM
  3. service air bag message
    By castor in forum GM Electrical Tech
    Replies: 1
    Last: 07-05-2011, 09:38 PM
  4. 09 Silverado, Service 4 Wheel Drive message
    By BigRed09 in forum GM Powertrain
    Replies: 2
    Last: 12-27-2010, 01:24 PM
  5. Service 4 Wheel Drive message
    By SlickMachine in forum GM Powertrain
    Replies: 5
    Last: 09-29-2010, 11:34 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •