Question about 1996 Chevrolet Tahoe

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I have a 96 chevy tahoe with a bad speed sensor in the transfer case but cannot figure out how to get it out, does it screw out or does it just need to be pulled off?

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  • jnero402 Jun 04, 2010

    ok, tried the ecm, and it still did the same thing as soon as the car warmed up, any more suggestions??

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  • Master
  • 1,297 Answers

Depends of if its an automatic or manual

automatic
Disconnect negative battery cable. Raise and support vehicle. Disconnect speed sensor electrical connector. Remove speed sensor retainer bolt. Using Speed Sensor Remover/Installer (J-38417), remove speed sensor. Remove speed sensor "O" ring from speed sensor.

manual
Disconnect negative battery cable. Raise and support vehicle. Disconnect speed sensor electrical connector. Remove speed sensor retainer bolt. Remove speed sensor. Remove speed sensor "O" ring from speed sensor.

but for either of these you may find that the little bugger is stuck in there... that's where the little GM tool works well


however, I have found that with a little elbow grease and big pair of pliers you can wiggle it out in one piece

good luck and keep me posted
Sean


Posted on May 30, 2010

  • 12 more comments 
  • jnero402 May 31, 2010

    thanks a lot man! can u tell me if the sensor is acually on the transmission or the transfer case? (been getting conflicting information) thanks

  • Sean Reisdorf
    Sean Reisdorf May 31, 2010

    well I don't have one in the shop right now but logically I'd say you'd find it on the extension housing of the transmission

    if it were on the transfer case you would not see a VSS unless you were in 4x4

    I'll see if I can confirm this some how from my electronic service manuals



  • jnero402 May 31, 2010

    ok sir thanks a lol id apreciate that!

  • jnero402 Jun 01, 2010

    you get a chance to find those manuals?

  • Sean Reisdorf
    Sean Reisdorf Jun 01, 2010

    sorry for the delay... busy day in the shop

    according to my electronic service manual the VSS, with a 5.0l or 5.7l, should be located on the left side of the transmission or left side of the transfer case for a 4x4

    ironically, we got a 96 GMC in this morning, same as yours with a 5.7

    here is the best pic I could take...



  • jnero402 Jun 01, 2010

    actually thats a range sensor, there should be one more sensor on there I believe.

  • jnero402 Jun 01, 2010

    my tranny wont shift its in "safe mode" speedometer doesnt work and abs light on, I was told it was my vehicle speed sensor, can u think of anything else it might be?

  • Sean Reisdorf
    Sean Reisdorf Jun 01, 2010

    according to my GM manual that should be the sensor in question
    I tend to believe it is correct since it is in the tailshaft of the case
    but let me do some more digging

    Sean



  • jnero402 Jun 01, 2010

    thank you I greatly apreciate that, like I said I was told it was the transmission speed sensor or "vss" and the pics im getting from the autostore look nothing like the range sensor. I actually replaced the sensor u showed me and i was still having the same result, tranny running in safe mode and speedometer not workin. Anything else u might think it could be?

  • Sean Reisdorf
    Sean Reisdorf Jun 01, 2010

    wow... are we having fun yet

    so lets back track here a second and see if I can fix your original concern since the parts issues are over with...

    Correct me if I'm wrong, but your concern is the speedometer does not work

    this "safe mode" you are talking about... I do not recall anything in the GM programming about a "safe mode"

    who told you it was in "safe" mode?
    if it was the parts store IGNORE them

    what they were trying to say is that it was in "limp" mode which is what newer vehicles have programmed into their computers... but we are talking like 2005 and up

    your vehicle, while smart... is still dumb in comparison

    So... give me, in GREAT detail, your "actual" vehicle concerns

    an example would be...
    My car won't start

    a GREAT example would be...
    My car will crank but not starts
    It cranks normally
    I hear the fuel pump running and I have spark but still will not start


    OK
    Sean



  • jnero402 Jun 01, 2010

    once again man THANKS A MILLION! ok when i start the car and drive, it runs fine for about 2 min until it warms up then i the speedometer stops working or at least becomes very intermittent. the transmission wont shift, it stay in what feels like maybe second gear no matter how much gas i give it. Simultaneous while all this is occuring the abs break light comes on and I can feel the abs working when it shouldnt be. Any ideas?

  • Sean Reisdorf
    Sean Reisdorf Jun 01, 2010

    thanks for the rest of the story

    lets look at this...



    your speedometer is indirectly controlled by the VSS
    but the ABS is actively looking at both the front wheel speed sensors

    However, if I expand the schematic larger I see something else...



    Now I see something interesting...
    the ABS module only monitors the front wheels
    what does it do for the back wheels?

    well....
    it uses the VSS but not directly
    instead... look at the 5th wire from the left on the vehicle control module
    this is a simulated VSS output for the ABS module

    Additionally... How does the speedometer calculate speed without an actual cable

    Again, it uses a simulated input that comes from where?????
    The Vehicle Control module

    I remember replacing a lot of these back in the day for a similar reason
    Most of the time they were just sooooo trashed because of their location.....
    Left Front Wheel Well

    I think now that I know what your real vehicle problems are and what you have already done it would be safe to assume that you have not had the left fender apart to diagnose

    not sure what this part costs today... but I know they were a big issue in the late 90's so I'm sure nothing has changed in 2010!


    Sean





  • jnero402 Jun 01, 2010

    Man! you are a piece of work! the schematic really helps on understanding whats whats wrong. (ima visual person lol) thanks a million man, ima try that and let u know what I find

  • Sean Reisdorf
    Sean Reisdorf Jun 01, 2010

    that's what happens when you become an automotive instructor...
    thanks I guess LOL

    let me know if you need anything else


    Sean



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1 Answer

Where is the speed sensors located on a 2001 Tahoe


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I have a 99 chevy tahoe 4X4 thats giving me problem.when pushing down on brake pedal it pushes back then the ABS light comes on and then the truck starts revving up and not shifting gears right and se


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