1. Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online
    Online since 2004, we are the #1 Chevy Truck & SUV forum and user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free
    Registering is Free and Easy! Hope to see you on the forums soon!

Service 4x4 Light On

Discussion in 'GM Powertrain' started by nlocho11, Sep 29, 2009.

  1. nlocho11

    nlocho11 New Member

    sometimes on startup, "serivce 4x4" message comes on in on-dash computer, and wont let me engage any 4x4 or 2wd, but goes off and wont come back on for a while. could it just be a sensor?
  2. Darknesss23

    Darknesss23 New Member

    What Year vehicle? I had the same issue in my 08 silv.... I took it to Danbury Chevy but they said they could not do anything about it since they could not replicate the issue... They said it could be improper use of the 4x4 system... they said you should always operate the vehicle in 2wd unless road(slippery, low traction) conditions call for the use of auto, 4H or 4L...
  3. nlocho11

    nlocho11 New Member

    its an 04 silverado 1500 and i always have the 2wd on unless im plowing and whatnot.
  4. Darknesss23

    Darknesss23 New Member


    I hear plowing does put a lot of stress on the 4WD.... I would have it checked by a Certified GM Mechanic just to be safe... what Part of CT you from?
  5. nlocho11

    nlocho11 New Member

    southern CT..East haddam...you?
  6. Darknesss23

    Darknesss23 New Member

    Western Ct, danbury area about 10 minutes from the NY border
  7. Jimmiee

    Jimmiee New Member 1000 Posts

    You may want to get it scanned for codes. It may have a code which can help pinpoint the problem. It may be a sensor or the switch itself. Have you ever serviced your transfer case? If not it's a good idea to do it every 30K . Keeping the fluid clean prevents fine metal particles from settling into sensors.
  8. MAsZ71

    MAsZ71 New Member

    I had this problem w/ my "old" 2004 Silverado Z71. I replaced the switch and had no more problems. However, with that said, I remember doing some research on this back then and found that there are several situations that can cause the Service 4x4 light to come on. I would get the codes scanned like Jimmiee suggested.

    This is a VERY COMMON problem with the '99 - '06 trucks. Hopefully, your situation is one of the simple (cheaper!) ones!!
  9. nlocho11

    nlocho11 New Member

    ok i got the codes scanned, when the light was off, because it hasn't been on for a while now and there were no error codes that came up. I have to get my plow serviced next week, new fluids and a new harness, so i'll have the mechanic there take a look as well.
  10. Jimmiee

    Jimmiee New Member 1000 Posts

    A code reader won't "see" transfer case codes. If the lights were flashing you have or had a code. The code will be stored as a history code. The only codes a code reader will see are OBD Generic "P" codes.

Share This Page