Question about 2004 Cadillac Deville

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Transmission problem: does't shift 4th speed (Cadillac Deville 2004, 41k)

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  • yuliy971 Oct 04, 2010

    Hi. For both questions: No

  • yuliy971 Oct 04, 2010

    Thanks, I go to Autozone.

  • yuliy971 Oct 04, 2010

    Hi! I checked. Device showes " No code".

  • yuliy971 Oct 04, 2010

    Thank You very much. For finish, tell me, please, what is RTM for 65 miles/h for 4th speed (OD)?

  • yuliy971 Oct 04, 2010

    Very helpful. Thanks

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This could be caused by a defective shift solenoid that would require transmission pan removal and valve body disassembly to replace the solenoid. Is there an engine light that is lit? Is there e trouble code displayed on the instrument cluster?

Posted on Oct 04, 2010

  • 1 more comment 
  • GetMeOttaHere Oct 04, 2010

    Ok, the next step would be to see if a trouble code is stored in the diagnostic memory of the PCM/TCM (engine control module/Transmission control module). If a code is stored,whicj I am sure there is, will point us in the right direction for diagnosis. I know most people do not have a code reader, but Autozone as well as other part stores will do this for free. Unless we rule this out, it becomes a guessing game and part replacement that would not necessary.

  • GetMeOttaHere Oct 04, 2010

    Ok, comment back with the results.

  • GetMeOttaHere Oct 04, 2010

    Have the transmission fluid changed. If you have not ever done so, now is the time. No codes, no solenoid problems.

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My 92 cadillac deville shift at 30mph and 6th do. You think it's the transmission .speed sensor


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For Automatic transmission problem,Check the list of help links below.click the link below:----Automatic transmission troubleshooting:----

http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html

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http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html

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http://schematicsdiagram.blogspot.com/2011/07/how-to-check-automatic-transmission.html

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http://schematicsdiagram.blogspot.com/2011/07/how-to-change-automatic-transmission.html

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http://schematicsdiagram.blogspot.com/2012/01/transmission-shifting-problem-on-toyota.html

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This will help.

Thanks.

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1 Answer

I have a '91 deville with 70k. The digital speedometer fluxuates sometimes goes to 0mph. The transmission shifting follows the speedometer. My local mechanic replaced the vss twice. First time it lasted 1...


I don't believe the problem is in the vehicle speed sensor. I suspect the problem may be the computer. The speed sensor is just a magnet inside the transmission with an induction coil outside to create an electrical signal every time the transmission output shaft turns. That signal goes to the computer and the computer tells the transmission when and how to shift and displays the speed on your electronic display. I would start by having a reputable transmission shop check out the transmission, then take it to a good mechanic to have him check the computer. It is a relatively expensive fix, but with only 70,000 miles on the Caddy, it should be worth it.

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