Location to adjust park/neutral switch '93 Deville
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Location to adjust park/neutral switch '93 Deville in Past Cadillac Vehicle Discussion; '93 4 door sedandeville, 4.9 liter, frontwheel drive, about 200,000 miles on it On random basis the SES light comes ...
  1. #1
    Team ZR-1 is offline Cadillac Owners Member
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    Question Location to adjust park/neutral switch '93 Deville

    '93 4 door sedandeville, 4.9 liter, frontwheel drive, about 200,000 miles on it

    On random basis the SES light comes on and trips a error code related to park/neutral switch.

    Starts just fine, every time, reverse lights come on when putting shifter into reverse.
    Is a bit stiff using shifter but does go into each gear selection.

    I found the shift cable and where the shift arm is on transfer case which is below the exhaust crossover pipe front from exhaust manifold and then about above that is oil filter.

    What I understand is there is supposed to be like a 3/32 hole for like a drill bit that loosen park/neutral switch 2 bolts and using drill bit turn housing a bit until drill bit goes into hole fully and that then proper adjusts the switch

    Sound correct ?

    I would think if it was out of adjustment then problem would occur every time rather then once in awhile and being it starts and using shifter works OK

    1. is it possible the switch got some engine oil in it ?
    2. Since exhaust pipe is right above it that heat over time degraded the switch ?

    As to adjustment, I see no adjustment hole, does the linkage arm that goes to shift cable have to come off first and then would see this hole ?
    And I see no way to get to the 2 bolts for casing or how shift arm comes off, does the crossover exhaust pipe have to come off ?

    Anything else that would trick ECM to think it's the p/n switch at fault ?

    Thanks for any advice

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  3. #2
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: Location to adjust park/neutral switch '93 Deville

    Do you have a FSM? I think you have to take the arm off.

  4. #3
    Team ZR-1 is offline Cadillac Owners Member
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    Re: Location to adjust park/neutral switch '93 Deville

    No I do not have a GM service manual
    I bought a Caddie service book at auto parts store but it is generic and has nothing for this year/model as to the P/N switch.

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Location to adjust park/neutral switch '93 Deville

    Subscribe the car to www.alldatadiy.com - the GM service manuals plus so much more that you need a home study course to find it all.

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Location to adjust park/neutral switch '93 Deville



    You need a FSM by Helm Inc. or a subscription to alldatadiy as Sub posted. Use the Caddie service book from the auto parts store to sop up coolant, oil and trans fluid spills (it's too stiff to use as toilet paper).

  7. #6
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: Location to adjust park/neutral switch '93 Deville

    Here.


  8. #7
    Team ZR-1 is offline Cadillac Owners Member
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    Re: Location to adjust park/neutral switch '93 Deville

    Not sure why the drawing does not state that the crossover exhaust pipe for this 4.9 L engine is only 2 inches above the P/N casing and no way can get any tools in there to take linkage off and loosen the 2 bolts.

    I tried again and you almost cannot even see the bolts

    So being the proper gears when shifting, starts fine,every time and reverse light come on I said the heck with it for now and since I do custom tuning I burned a new E-prom and turned off the DTC 91 so the SES light cannot come on.

    If shifter then gets worse I would have to fight to get the 4 exhaust stud nuts off and get the pipe out of the way.

    Thanks for all those that replied with help !

  9. #8
    brougham is offline Cadillac Owners Master
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    Re: Location to adjust park/neutral switch '93 Deville

    My 1994 has the same sort of problem. The way the switch outputs it's signal it's possible for it to have a problem but for reverse and everything else to act normally. I've been told that it's a lot more common for the problem to be the switch itself then needing to be adjusted.

    The switch is sealed, so if it got oil in that's already a problem. There is an adjustment hole. I couldn't see it either but with the arm off it's like a cut away view and you can see the hole and exactly where it goes just like that picture from the manual. It's there so you can stick a pin in it and adjust it without taking anything apart. On a 94 the exhaust is routed differently so it's a bit easier to get to the part.

  10. #9
    Team ZR-1 is offline Cadillac Owners Member
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    Re: Location to adjust park/neutral switch '93 Deville

    I agree as I suspect it is the switch itself that has gone bad.
    Taking a photo at a angle, 1/2 of the switch casing where the nut for linkage and the 2 mounting bolts are hidden with crossover pipe and no room at all to get any tool in there

    Being the oil filter is about right above switch and the looks of it over time maybe when oil filter was changed some oil dripped into the switch and then the exhaust pipe heat cooks the switch
    Attached Images

  11. #10
    onecool is offline Cadillac Owners Fanatic
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    I belive the hole lines in with shifter in neutral or park I can't remember right now and some times its just a cut away and not always straight across.
    sometimes it's a plastic pin that's sheared off, in that case though it would remain pluged.

  12. #11
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: Location to adjust park/neutral switch '93 Deville

    Nah, just remove the air cleaner housing to give yourself a little more breathing room. Not that bad.


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