2000 SLS "Thinks" it's in gear after placing in Park
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 2000 SLS "Thinks" it's in gear after placing in Park in Past Cadillac Vehicle Discussion; Hi All: New to the Forums, as I finally got my Caddy after years of dreaming. Anyway, the dreams have ...
  1. #1
    bjschaner is offline Cadillac Owners Member
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    2000 SLS "Thinks" it's in gear after placing in Park

    Hi All:

    New to the Forums, as I finally got my Caddy after years of dreaming.

    Anyway, the dreams have turned to nightmares...recently, the car has become an electrical nightmare, of which I've corrected most of. (used, but got a great deal) Anyway, I've run into an issue where the car 'thinks' it's in gear after I place the shift handle into Park. If I place the car back in gear, it bangs pretty hard when placed in drive, and shifts very hard through each gear. Also, on the IP, the PRND321 under the digital speed display 'loses' the hash mark that shows what gear you're in. If you put the car in park at this point and turn it off, you won't restart it again, unless you did like I did, and broke the plastic housing off the starting relay and start it 'manually'.

    I know I have issues with the underhood fuse block, but the stealership wants a cool 565 bucks for it, and I promptly got one from a junkyard for 100 bucks. My question- should I replace the shifter assembly also ? Is there a 'position switch' on the shifter stalk that 'tells' the computer what gear the car is in ? Also, if you place the car in park, the daytime running lights stay on. And I found that if I jiggle with the #13 (I think) fuse on the underhood fuse block, I can 'reset' this problem. But when I start moving the shift handle around, voila, the problem returns.

    FYI< I ran my code scanner across it came up with the codes related to the "D-3 Postion, 2-1 Postion" etc, etc. on it.

    Any feedback appreciated, thanks in advance !


    2000 Seville SLS With "Y" in the VIN Code

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  3. #2
    Crown Vic Owner is offline Cadillac Owners Connoisseur
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    maybe the shifter is just acting stupid and blowing fuses?

    Our shifters are completely electronic, right?

  4. #3
    JC316 is offline Cadillac Owners Connoisseur
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    Sounds like the position switch on the transmission is goofed. Has anyone ever taken it off? It's easy to put it back on wrong.

  5. #4
    chubbyranger is offline Cadillac Owners Connoisseur
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    There is a set of switches that detect which gear the selector is in and you can actually get a code that detects if the transmission is in a different gear than the transmission is in. I believe your problem might be in the shifter position detection switches, in particular the park switch may not be working so it doesn't think you shifted it back into park. Do you have a FSM?

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    No, the shifter is not completely electronic. The desired gear or sequence is set by a cable and arm connected to the transmission and the position switches and shift algorithms take over from there. Sort of "mechano-electric".

    There was a thread about this six months ago.

  7. #6
    CadillacSTS42005's Avatar
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    nope
    my 03 STS had the same problem
    it was solved by 1st adjusting the shift linkage (solved the problem for about a week)
    then adjusting the cable (lasted not an hour)
    end fix was the transmission fluid pressure switch, not fun, not cheap, requires the valve body in the tranny to be dropped, my GMPP covered it though....

  8. #7
    Ranger's Avatar
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    My guess would be the PRNDL switch is failed or needs adjustment. I would not touch it without a FSM. Always start diagnostics by pulling the DTC's.

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    bjschaner is offline Cadillac Owners Member
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    Thanks for the feedback so far- I"m going to replace the front fuse block tomorrow (it needs replaced anyhow) and I picked up a new shfter assembly from a scrapyard because the stealership wanted 286.00 for that....got mine for 65....

    Ranger- you mentioned a PRNDL switch...where is this located ?

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    Ranger's Avatar
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    I was thinking of my '92 (4T60E). Just went out and checked my '03 (4T80E) and I don't see one. It may be internal from what I can see.

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    bjschaner is offline Cadillac Owners Member
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    I've been doing some research on Alldatadiy.com (bought a year of service manuals for the car) and now I'm wondering if it's not an "INTERNAL MODE SWITCH" ???

    What's bothering me is that a few months ago, it started this 'hard shifting' and wouldn't start, and out of frustration I slammed the underhood fuse block and it started....no problems for over two months, and now out of blue it showed up again, and got bad fast. Oddly, if everything was working well, and then the problem occured (for instance, I park the car and put it into Park) and the 'hashmark' under the PRND321 dissapeared- if I was to leave the engine run and go out and pull the fuse for the "transmission" under the hood fuse block and plug it back in, then it would be fine, except I would NOW have the DTC. At any rate, it started giving me troubles, and now it doesn't seem that I can jimmy-rig it by playing with the fuse.

    Does this shed any more light ? Any other ideas guys ?

  12. #11
    bjschaner is offline Cadillac Owners Member
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    FYI:

    Here are some of the codes I've been able to pull off it. Sorry, I'm trying to go from memory, because it's cold here and the girlfreind would probably throw something at me if I went outside to "work on the damn car" again.

    DTC P1825
    Internal Mode Switch - Invalid Range

    DTC P1842
    1-2 Shift Solenoid Circuit Low Voltage

    DTC P1845
    2-3 Shift Solenoid Circuit Low Voltage

    DTC P1860
    TCC PWM Solenoid Circuit Electrical

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    chubbyranger is offline Cadillac Owners Connoisseur
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    The profusion of codes may be caused by having pulled the fuse. I would clear them and see which ones return with constant power. I would also hunt down the switch that tells the PCM what gear the selector is in and find out if it is working correctly since the message that you're in Park doesn't seem to be getting through. I would suspect that the hash mark disappearing means its getting NO signal for the shifter position. I cannot find your DTCs in my 99 FSM P-codes do not go up that high for me.

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    Ranger's Avatar
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    What's bothering me is that a few months ago, it started this 'hard shifting' and wouldn't start, and out of frustration I slammed the underhood fuse block and it started....no problems for over two months, and now out of blue it showed up again
    Is there any corrosion or oxidation on the fuse block contacts and are they tight?

  15. #14
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    Jesus doesnt ANYONE listen
    my car did the same thing
    i said what to replace
    heres my vid of the car doing EXACTLY what you said
    stop wasting your money buying a shifter and attempting to adjust the linkage
    its the TRANNY FLUID PRESSURE SWITCH
    subject done
    http://www.youtube.com/watch?v=6_vJHc9PMgc

    why ask for help, the answeres given, then ignore it, and continue to ask?

  16. #15
    Playdrv4me's Avatar
    Playdrv4me is offline Cadillac Owners 10000+ Posts
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    Re: 2000 SLS "Thinks" it's in gear after placing in Park

    ^^ Yes, that.

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