No overdive
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Northstar Engines and System Technical Discussion Discussion, No overdive in Cadillac Engine Technical Discussion; 96 N* STS No overdrive on my Caddy - seems the solenoid is gone in the trans? It just suddenly ...
  1. #1
    thehammer is offline Cadillac Owners Member
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    Aug 2005
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    Question No overdive

    96 N* STS

    No overdrive on my Caddy - seems the solenoid is gone in the trans? It just suddenly stopped working. Still drives fine, but no overdrive, so the freeway mpg is limited to around 20 or so average. I used to get 24 or so.

    I live in an apartment - no tools, no space, so have to have a shop do it for me. Any idea how much this should cost?

    Is it "safe" to get this done at a non-dealership trans place like AAMCO??

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  3. #2
    mcowden is offline Cadillac Owners Connoisseur
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    Re: No overdive

    Quote Originally Posted by thehammer
    96 N* STS

    No overdrive on my Caddy - seems the solenoid is gone in the trans? It just suddenly stopped working. Still drives fine, but no overdrive, so the freeway mpg is limited to around 20 or so average. I used to get 24 or so.

    I live in an apartment - no tools, no space, so have to have a shop do it for me. Any idea how much this should cost?

    Is it "safe" to get this done at a non-dealership trans place like AAMCO??
    Look at the first thread in the Northstar forum "Got codes?" and it will tell you how to check them and look them up. Let us know what you find.
    Mike

  4. #3
    thehammer is offline Cadillac Owners Member
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    Thread Starter

    Re: No overdive

    OK, thanks Mike.

    Codes are as follows:

    PC0171 PC0174 PC0603 PC1520 IR1740

    No Codes for IPC, ACM, SDM, TCS, RSS, PZM, RFA, CCP

  5. #4
    J.A.O. is offline Cadillac Owners Fanatic
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    Re: No overdive

    I had the same thing happen to my car about 6 months ago. It was indeed the solenoids but what was really strange was that there were no codes at all.

  6. #5
    thehammer is offline Cadillac Owners Member
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    Thread Starter

    Re: No overdive

    Did you fix yourself, or have a dealer do it? What sort of costs am I looking at here?

  7. #6
    nvmyvettes is offline Cadillac Owners Member
    Join Date
    Jan 2006
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    Re: No overdive

    http://www.v8mr2.com/reference/transaxle4.pdf
    Check this out for tranny diagnostic!!
    Bad sensors on the motor will allso cause you not to have o/d. Are any of those codes solenoid codes? And are they all current or history? I would try disconnecting the negative battery cable to reset the codes drive and and then scan again

  8. #7
    zonie77 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 ETC,97 STS
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    Re: No overdive

    You can get "sticky" solenoids. I had it happen in a 4L60E and it has been a common thread here. No code because the solenoid hasn't hit whatever threshold is needed to set a code but it isn't moving far/fast enough to shift.

    Check what nvmyvettes posted first. If not, any shop can change solenoids or if you are inclined you can do it yourself. There are threads with instructions and pics.

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