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Thread: '06 DTS transmission stuck in 3rd but does random downshift to 1st

  1. #1
    NTS 01 is offline Cadillac Owners Member
    Automobile(s): 2006 DTS
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    Question '06 DTS transmission stuck in 3rd but does random downshift to 1st

    Help. Various issues. Transmission stuck in 3rd (P, R, @N work), but when driving the locks will cycle and the tranny shifts to 1st. A couple minutes later, the reverse happens (back to third). Additionally, the radio stays on after engine off and door open.

    Anyone with any suggestions on cause before I go and get raped by dealership? All issues popped up at same time.


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  3. #2
    Superjim's Avatar
    Superjim is offline Cadillac Owners Connoisseur
    Automobile(s): 2011 DTS Platinum
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    Re: '06 DTS transmission stuck in 3rd but does random downshift to 1st

    There is a way to REBOOT all of the electronic modules in the entire car.
    Sometimes ( lots of times) that will fix random electrical gremlins.

    Remove BOTH battery cables... negative cable FIRST...
    Touch both cables together for 5 seconds or so, making sure they have good contact with each other.
    This will drain all the capacitors in the system.

    While you have the cables off... undo the one bolted to the floor.
    Take a little piece of sandpaper and sand the paint away from the attachment point.
    It will then have a better ground.

    Re-attach the battery cables... negative cable LAST...
    You will have to do the window EXPRESS UP learn again and you MAY have to do the memory seat settings again.
    Sometimes they will forget the seat settings and sometimes they don't.

  4. #3
    Join Date
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    Re: '06 DTS transmission stuck in 3rd but does random downshift to 1st

    Quote Originally Posted by NTS 01 View Post
    Help. Various issues. Transmission stuck in 3rd (P, R, @N work), but when driving the locks will cycle and the tranny shifts to 1st. A couple minutes later, the reverse happens (back to third). Additionally, the radio stays on after engine off and door open.

    Anyone with any suggestions on cause before I go and get raped by dealership? All issues popped up at same time.
    Hello NTS 01,

    Welcome to Cadillac Owners! You will learn a lot of insightful information while being an active member. I already see forum members engaging in your post and trying to help you with your current situation. If you choose to bring your vehicle into the dealer, please let me know. I can be contacted via private message and would like to assist you during that process. Gregory and I monitor the Cadillac forums and are here to help with vehicle inquiries and concerns.

    Sincerely,

    Laura M.
    Cadillac Customer Care

  5. #4
    danog is online now Cadillac Owners Fanatic
    Automobile(s): 1936 cadillac 08 DTS 11 DTS
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    Nov 2011
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    Re: '06 DTS transmission stuck in 3rd but does random downshift to 1st

    wrong trans. We do have the 4T80E
    Last edited by danog; 10-31-13 at 03:55 PM.

  6. #5
    Tom's Caddy's Avatar
    Tom's Caddy is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 CTS/ 2008 DTS/ 2008 STS V8 N*/ 2011 CTS4 ALL W/D Pearl
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    Re: '06 DTS transmission stuck in 3rd but does random downshift to 1st

    Do we not have 4T80E tranny RPO MH1?
    Last edited by Tom's Caddy; 10-31-13 at 02:38 PM.

  7. #6
    hazcaddy's Avatar
    hazcaddy is online now Cadillac Owners Enthusiast
    Automobile(s): 2016 XTS4, 2010 DTS (gone), '07 STS4 (gone), '03 DHS (gone)
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    Re: '06 DTS transmission stuck in 3rd but does random downshift to 1st

    I checked my Build Sheet and all it has is"MH-1 Transmission, Automatic" and "MX0 - Transmission, 4-spd automatic".


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