4T80e TCC Solenoid
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  • 2 Post By basscatt
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 4T80e TCC Solenoid in Past Cadillac Vehicle Discussion; Hi everybody, I'm new to this forum and I have an issue I need an answer for. I have a ...
  1. #1
    4T80e is offline Cadillac Owners Member
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    4T80e TCC Solenoid

    Hi everybody, I'm new to this forum and I have an issue I need an answer for.

    I have a 99 Cadillac Deville, 72000 miles, for a few months now my torque convertor has been slipping and has been getting worse.
    I have the code P0741 present and diagnosed it as the TCC Solenoid. Thanks to this forum.
    I finally found the courage to do it this weekend, it was tough, especially getting the pin clip in to secure the Solenoid.
    Anyway, filled the transmission, started engine and right away there was a grinding noise, it went away and when shifting through gears theres a clunking noise.

    Now I dont remember putting the plug back into the Solenoid and I would like to know the consequences of leaving it unpluged. I need my car to get to and from work during the week. Right now there is no codes.

    i would have to redo it next weekend.

    Thanks in advance...

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  3. #2
    PineyJustice is offline Cadillac Owners Fanatic
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    Re: 4T80e TCC Solenoid

    You just left the solenoid unplugged or did you forget the pin?

    Leaving it unplugged isn't an issue, same as having a non functional solenoid.

    Leaving the pin out would be really bad...

  4. #3
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 4T80e TCC Solenoid

    --------------------------------------
    I have the code P0741 present
    and diagnosed it as the TCC Solenoid. Thanks to this forum.


    you should have read more about the P0741 code -

    when this code is displayed by itself - the problem is NOT the solenoid -
    the problem IS the torque converter seals -
    replacing the solenoid will NOT help or change this problem -

    the ONLY way to solve the P0741 code is to drop the trans and replace the seals -

  5. #4
    4T80e is offline Cadillac Owners Member
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    Re: 4T80e TCC Solenoid

    Thank you both for your speedy replies.

    Thanks to the internet I found the Pin connector harness and getting 20.13ohms of resistance through the solenoid, so I must have plugged it in unconsciously and refuse to take it all apart again just to see if I connected it. I do remember putting the clip in and only taken me 3 hours of trying and cursing.

    basscatt, I was debating weather it would be that, I also read about the seals, my code is P0741 and have no other codes present and there is no way Im going to do that job by myself after my experience with the Solenoid.
    Would you suggest replacing the torque convertor? How much would a job like this cost for the seals?

  6. #5
    PineyJustice is offline Cadillac Owners Fanatic
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    Re: 4T80e TCC Solenoid

    I had both p0741 and p1860, replaced the solenoid and my torque converter blew up.

    A full trans rebuild cost me 1600 and it came back fully functional, so I'm guessing getting the seal fixed should cost you between 1000 and 1600.

  7. #6
    70cougar is online now Cadillac Owners Enthusiast
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    Re: 4T80e TCC Solenoid

    It costs about $1,500 at a good indie shop that knows these transmissions. More at a dealer. The parts alone if you tackle it yourself are about $400. There is a GM TSB on here that tells you what parts to check once transmission is out and open. Lot bigger job than the one you just did.

    But many drivers don't bother to fix it & it doesn't cause any other problems except slightly lower gas mileage. Only real reason to do it is if you have to pass emission testing where you live.

    Piney - where did you get a full rebuild for $1,600? Standard labor hours just to get the transmission out = 8, and same to put it back in. Thus, with parts, the TCC repair costs about $1,500 with fairly low labor rates per hour. A full rebuild, with more parts & labor used, has to be lot more unless you paid ridiculously low labor rates.

  8. #7
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 4T80e TCC Solenoid

    basscatt, I was debating weather it would be that, I also read about the seals, my code is P0741 and have no other codes present and there is no way Im going to do that job by myself after my experience with the Solenoid.
    Would you suggest replacing the torque convertor? How much would a job like this cost for the seals?
    [/QUOTE]
    -----------------------------------------
    I agree with 70cougar many drivers don't bother to fix it - referring to the P0741 code -

    HOWEVER - your original statement bothers me -
    "for a few months now my torque convertor has been slipping and has been getting worse.

    how do you know your torque converter is slipping -
    and why do you think it is getting worse?

    if your symptoms include the engine revving up and going nowhere -
    it could be the trans is slipping and you are assuming it is the torque converter
    because of the P0741 code.

    My guess is that your trans is slipping - and it will need to be completely rebuilt -
    I would further guess that the actual cost will be closer to $2500

    read this about the P0741 code -
    it will explain everything in detail and has pics of the worn seals

    http://www.cadillacforums.com/forums...60-1998-a.html

  9. #8
    4T80e is offline Cadillac Owners Member
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    Re: 4T80e TCC Solenoid

    Thanks again for your replies.

    The torque converter is slipping, if I put the gas pedal 1/2 way down from a stand still, there is allot of loss of power but the RPMs climb.
    I believe I will have to get a rebuild because I saw fine metal fillings in the fluid. Not a good sign.
    I know the RPMs is the transmission, because I've changed the Throttle Possition Sensor, Idle Air Control
    Valve, Map Sensor etc & still occurs sporadically & Hense it's not a Intake Manifold Gasket.

    Any transmission specialists in Pembroke Pines South Florida?
    What's your views on AAMCO? I have one close by & will get a quote.
    Have decided to get the rebuild, it's better than getting a new car & be stuck with a payment ��

  10. #9
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 4T80e TCC Solenoid

    What's your views on AAMCO?

    AAMCO shops are independently owned - franchised shops -

    there MIGHT be a good one somewhere - but most are thieves -
    how can you tell the difference? -

    if you get the canned speech -
    "no one can tell you how much it's going to cost to fix your trans
    until we know what the problem is -
    we need to drop it and disassemble it to find out -
    and it is going to cost $XXX to diagnose it" -


    RUN AWAY!

    with the exception of a rare broken "hard-part" inside the trans -
    they know - down to the penny - how much to rebuild the trans -

    to find a good trans shop - ask around -
    but also check for complaints filed with the BBB
    70cougar and 70cougar like this.

  11. #10
    PineyJustice is offline Cadillac Owners Fanatic
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    Re: 4T80e TCC Solenoid

    I had a guy who used to work for a dealer rebuilding transmissions rebuild it.

    These days he just works on transmissions out of a shop in his barn, so not an actual company but he does warranty his work.

  12. #11
    4T80e is offline Cadillac Owners Member
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    Re: 4T80e TCC Solenoid

    For those who are interested.

    Today I called a few transmission specialists in the area,

    1: $1400
    2: $2000
    3: Have to bring it in and diagnose it before giving a price.

    The first, somebody had recommended it, hes had a great experience with them and the transmission has lasted.

    http://stevestransmissions.net/

  13. #12
    johnmcd1957 is offline Cadillac Owners Member
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    Talking Re: 4T80e TCC Solenoid

    My Name is John I have had my 1999 concours 13 YEARS. I have had the the code Po741 for over 6 years. As some of the threads said I too
    have learned to live with it. I clear the code until it reads again and the light comes on. Interestingly it still at time still will show up as history instead of reading current. It's a king kong annoyance but It runs smooth plenty of power and I have no complaints about my fuel economy. My white diamond old girl has almost 200k and she still will make the A Longshoremen take notice,,LOL You D*m$ right she paid for and she's fine. Their is for FYI Jasper and they are rated very well and they will ship the transmission anywhere you need it to go.
    Peace.

  14. #13
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    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Re: 4T80e TCC Solenoid

    John.

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