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Thread: Transmission wont shift, tach stuck on zero, speedometer stuck on 45mph

  1. #1

    Default Transmission wont shift, tach stuck on zero, speedometer stuck on 45mph

    Hi everyone,


    My vehicle feels like it wont come out of second gear. Also it feels like it starts in second gear. The tach is on 0 and the speedometer is stuck on 45.

    Also, I am not getting fuel to the filter, atleast enough to keep it running at wot.

    Thanks for any help.

    Don

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
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    2,681

    Default

    Bad ignition switch/fire wall ground?
    Grant H.
    1994 6.5 turbo GMC K2500 HD suburban "F" VIN FSD heat sync #9 resistor, PMD in the bumper, no cat, mechanical waste gate, 220,000 miles, 4L80E Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3

    Default Hi

    I just replaced the ignition switch. What firewall ground should I check?

    Thanks,

    Don

  4. #4
    Join Date
    Feb 2007
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    Baja California Sur Mexico
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    2,681

    Default

    Look along the wall above/behind the engine for grounded wires, they change positions depending on year. Also could be the ignition switch harness, if it was only a gage problem then pulling the instrument panel and cleaning the contacts can cure that.
    Grant H.
    1994 6.5 turbo GMC K2500 HD suburban "F" VIN FSD heat sync #9 resistor, PMD in the bumper, no cat, mechanical waste gate, 220,000 miles, 4L80E Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  5. #5
    Join Date
    Sep 2007
    Posts
    10

    Default

    Quote Originally Posted by don bad View Post
    Hi everyone,


    My vehicle feels like it wont come out of second gear. Also it feels like it starts in second gear. The tach is on 0 and the speedometer is stuck on 45.

    Also, I am not getting fuel to the filter, atleast enough to keep it running at wot.

    Thanks for any help.

    Don
    stuck in second is indicative of limp mode. ses lite on? check for codes, there should be at least one
    1995 K3500 DRW 6.5TD F 4L80E high idle switch, manual TCC lock-up, air box mods, snorkelectomy, K&N filter, 4" with flowmaster and 5" tip, autometer boost pyro and tranny gauges, Max-E-Tork v2.0

  6. #6
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
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    2,681

    Default

    He's got 15 48 84 99, too many at one time, indicates an obscure problem, that's why I say ground, or connections. He has just replace the IP so may have disturbed a connector.
    Grant H.
    1994 6.5 turbo GMC K2500 HD suburban "F" VIN FSD heat sync #9 resistor, PMD in the bumper, no cat, mechanical waste gate, 220,000 miles, 4L80E Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  7. #7

    Default Hi

    I have 3 codes 81,82,83. I am starting to think Ground, possibly the one on the block. Should I run another ground somewhere. I still don't get the tach on 0 and speedo on 70 now. And the shift indicator isn't on.

    Don

  8. #8

    Default Now I am getting a code 29 also

    I checked grounds the one on the front passenger side of the block and the one at the back of the block same side. Also, drivers side. Does anyone know any others? I will check connections now, and hopefully we can find a problem. The codes are all transmission ones, and the other thing is that there is no tach and mph is stuck at 70. Also, no shift indicator light.. I just noticed that my headlights wont come on either.

    Thanks,

    Don

  9. #9
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,681

    Default

    Forget the engine grounds, that causes the starter not to work, look for body grounds, come off the batteries to the inner guard.
    Grant H.
    1994 6.5 turbo GMC K2500 HD suburban "F" VIN FSD heat sync #9 resistor, PMD in the bumper, no cat, mechanical waste gate, 220,000 miles, 4L80E Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

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