Service 4WD light came on
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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, Service 4WD light came on in Cadillac Escalade Forums; It's snowing like a mofo here in N.H., leaving the gym i decided to romp around in "auto 4wd" in ...
  1. #1
    thehurtmac is offline Cadillac Owners Member
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    Service 4WD light came on

    It's snowing like a mofo here in N.H., leaving the gym i decided to romp around in "auto 4wd" in the parking lot in my 2000 escalade, my service 4wd light came on after a few minutes, so i stopped messing around and went and got gas. Turned it back on and never came back on during the 10 mile drive home. Any clues? I've only had it for maybe 600-700 miles, haven't done any regular maintenance on it yet.

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  3. #2
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
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    Quote Originally Posted by thehurtmac
    It's snowing like a mofo here in N.H., leaving the gym i decided to romp around in "auto 4wd" in the parking lot in my 2000 escalade, my service 4wd light came on after a few minutes, so i stopped messing around and went and got gas. Turned it back on and never came back on during the 10 mile drive home. Any clues? I've only had it for maybe 600-700 miles, haven't done any regular maintenance on it yet.
    I would say its the switch (are the lights flashing or not doing a thing?)

  4. #3
    thehurtmac is offline Cadillac Owners Member
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    Re: Service 4WD light came on

    it just blinks when i try to put it in 4low, blinks then goes solid when i press the other 3 buttons, sometimes the light will disappear and come on randomly, confusing as hell and no clue how to fix it

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    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
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    Quote Originally Posted by thehurtmac
    it just blinks when i try to put it in 4low, blinks then goes solid when i press the other 3 buttons, sometimes the light will disappear and come on randomly, confusing as hell and no clue how to fix it
    Replace the switch I know as I had a friend who works at the collage I go to and his trucks transfer case went into neutral when his four wheel drive control switches failed he replaced the switch and didn't have a problem

  6. #5
    Fox2boost is offline Cadillac Owners Member
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    My money is on the shift solionid next to the transfer case did one on a surburban last year same symptom. Not cheap either. I wanna say the part was around 200. Six pack job.

  7. #6
    thehurtmac is offline Cadillac Owners Member
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    Re: Service 4WD light came on

    After 8 long months I finally got the new LM7 heart transplant. Its running rough because it hasnt been tuned yet and everything works except my 4wd...

    I replaced the front solenoid and switch. All the lights on the switch blink once when I turn the key and that's it. I press and hold a button, nothing. I've yet to replace the rear diff solenoid but I have no clue why none if the lights come on.

    Any clues?

  8. #7
    the cadillac man's Avatar
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    Replace the switch and all should be good

  9. #8
    thehurtmac is offline Cadillac Owners Member
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    Re: Service 4WD light came on

    Quote Originally Posted by the cadillac man View Post
    Replace the switch and all should be good
    I already replaced the switch and the front actuator. I stated this in my previous post.

  10. #9
    the cadillac man's Avatar
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    Quote Originally Posted by thehurtmac
    I already replaced the switch and the front actuator. I stated this in my previous post.
    Is the fuse blown?

    If not then it may be the control module that works the system

  11. #10
    thehurtmac is offline Cadillac Owners Member
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    Re: Service 4WD light came on

    Quote Originally Posted by the cadillac man View Post
    Is the fuse blown?

    If not then it may be the control module that works the system
    I checked all the fuses. Pulled all 3 plugs to the T-case, they all have power or ground. It's getting tuned this week then I'll get a type 2 reader and figure it out. Sure is pissing me off though. The lights come on and go out when you turn on the ignition and that's it, and sometimes the lights don't even blink when you turn the key.

  12. #11
    the cadillac man's Avatar
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    Quote Originally Posted by thehurtmac
    I checked all the fuses. Pulled all 3 plugs to the T-case, they all have power or ground. It's getting tuned this week then I'll get a type 2 reader and figure it out. Sure is pissing me off though. The lights come on and go out when you turn on the ignition and that's it, and sometimes the lights don't even blink when you turn the key.
    Check for voltage at the module
    Its behind the headlight switch

  13. #12
    thehurtmac is offline Cadillac Owners Member
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    Re: Service 4WD light came on

    Does it say TCCM on it or anything that i will know what it is?

  14. #13
    the cadillac man's Avatar
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    Quote Originally Posted by thehurtmac
    Does it say TCCM on it or anything that i will know what it is?
    It might never had to get one

  15. #14
    thehurtmac is offline Cadillac Owners Member
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    Re: Service 4WD light came on

    No clue what that means. Any 4x4 with the push button selection has a TCCM, automatic transfer case control module. It wouldnt work without one.

  16. #15
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
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    Quote Originally Posted by thehurtmac
    No clue what that means. Any 4x4 with the push button selection has a TCCM, automatic transfer case control module. It wouldnt work without one.
    Any of them with a transfer case has that module even mine does and its all wheel drive

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