Question about 1997 Buick LeSabre

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1997 buick lesabre relay prob

My speed gauge one day stopped working and went all the way to 0mph. then all of the sudden my car will not shift gears. it drives in first only. when i open the relay box and take out the fuses and put them back in and then i drive my car and it will start working again. After a few mins it will stop working. I had a test done on it for the code and it is telling me p0740 can someone please helP! i called a mech and was told to change the speeddometer relay fuse first then if that doesnt work change the TCC

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  • lorie_calder Mar 01, 2009

    So when my speed sensor went out thats what is causing the problem with my car not shifting gears right. I know theres nothing wrong with the transmission i know. so the speed sensor is whats causing all this problem?

  • Anonymous May 02, 2009

    i have a 97 buick lesabre and it drives fine in reverse but pulling out its real slow!!!!!!

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  • 4,669 Answers

Try replacing the vehicle speed sensor. I don't think it has a speedo relay and the Torque Converter Clutch would not cause this problem.

Posted on Mar 01, 2009

  • Clint Smock
    Clint Smock Mar 01, 2009

    Yes, If the powertrain control module doesn't know how fast you are going it won't ground the shift solenoids that change the gears. The whole problem is the vehicle speed sensor.

  • truman swinyer Nov 07, 2011

    where is a clutch circuit

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