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Thread: 1999 STS - Not shifting out of first gear

  1. #1
    preissnem15 is offline Cadillac Owners Member
    Automobile(s): 1999 Seville STS
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    1999 STS - Not shifting out of first gear

    Hello, I have a 1999 STS and about 2 weeks ago I took the car on a trip where I drove about 150 miles and the car ran great. I got to my destination, parked the car for about an hour, then took another short drive and right away I knew the car was not shifting out of first gear. The RPM's would rise but it would not down shift what so ever. I took it in and there were a few codes that came up but they said that the main one was the Mass Air Flow Sensor was bad. So I had them replace this and got the car back and it shifted perfect just like it did the day I took the long drive. Yesterday I drove a short distance to one of my friends houses to hang out for a little bit and the car was still shifting and running fine. After about 4 hours of sitting, I got back in the car to drive home and again the car would not shift and the SES light came on. I have no idea what could be causing this and if it is again the MAF sensor, what could be causing this to go bad so quickly?! Please help!

    Matt


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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The MAF has nothing to do with shifting (and there are multiple codes for it). It's not the problem (although you didn't get it at AutoZone, did you?).

    List all of your codes, AND their definitions.

  4. #3
    preissnem15 is offline Cadillac Owners Member
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    Well the mechanic said that it is tied in with the computer that tells the car when to shift. Obviously he could be blowing smoke but when they changed it after the first time this happened it shifted again. This is why I assumed it was the same thing. I don't have the codes right now as it is currently -15 degrees here in Wisconsin with a wind chill of -45 so working outside is not an option but I'll see if it warms up tomorrow a bit and get back to you

    ----------

    And no I didn't get the MAF at auto zone haha

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 STS - Not shifting out of first gear

    Quote Originally Posted by MoistCabbage View Post


    The MAF has nothing to do with shifting (and there are multiple codes for it). It's not the problem (although you didn't get it at AutoZone, did you?).

    List all of your codes, AND their definitions.
    Including the welcome.

    You may find a shift solenoid code.

  6. #5
    preissnem15 is offline Cadillac Owners Member
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    See and shift solenoid was one of my first guesses but why would the car go from shifting fine, to not shifting, to changing the MAF which for some reason caused it to shift normal again, and finally now not shifting again. If the solenoid burned up initially then it would never go from not shifting back to shifting. Just a thought.

    Codes will come tomorrow hopefully depending on weather.

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 STS - Not shifting out of first gear

    I think changing the MAF sensor was strictly coincidental.

  8. #7
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
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    Re: 1999 STS - Not shifting out of first gear

    Quote Originally Posted by Ranger View Post
    I think changing the MAF sensor was strictly coincidental.
    Probably, but also,
    If sol A is bad, trans will only have 2nd or 3rd and
    if sol B is bad (or broken as usual) trans will only have 1st & 2nd.

    Is your speedo always working consistantly?
    If so, have TPS sweep checked.


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