'06 DTS transmission stuck in 3rd but does random downshift to 1st
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  • 1 Post By Superjim
  • 2 Post By danog
Cadillac DTS Forum - 2006 through 2012 Discussion, '06 DTS transmission stuck in 3rd but does random downshift to 1st in Past Cadillac Vehicle Discussion; Help. Various issues. Transmission stuck in 3rd (P, R, @N work), but when driving the locks will cycle and the ...
  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 online now 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.
    Cadillacman916 likes this.

  4. #3
    Cadillac Cust Svc's Avatar
    Cadillac Cust Svc is offline Cadillac Customer Service
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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 offline Cadillac Owners Fanatic
    Automobile(s): 1936 cadillac 05 deville 08 DTS
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    Re: '06 DTS transmission stuck in 3rd but does random downshift to 1st

    wrong trans. We do have the 4T80E
    Superjim and Tom's Caddy like this.

  6. #5
    Tom's Caddy's Avatar
    Tom's Caddy is offline Cadillac Owners Fanatic
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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?

  7. #6
    hazcaddy's Avatar
    hazcaddy is offline Cadillac Owners Fanatic
    Automobile(s): 2010 DTS Premium, '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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