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Thread: 2009 CTS-V Strange Downshift

  1. #1
    Tuner
    Join Date
    Sep 2011
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    Germany
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    2009 CTS-V Strange Downshift

    Hi,

    my customers 2009 ctsv autom. shifts on highway from 6 to 5 and i dont know why.
    my customer like to drive up to 250km/h in 6 gear to save fuel but on light accererate 50% TPS the car shifts at 221km/h down in 5 gear. (see log file time 2:54)

    any ideas?

    Thanks
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    Last edited by zr1driver; 10-06-2019 at 06:25 AM.

  2. #2
    Senior Tuner Russ K's Avatar
    Join Date
    Dec 2005
    Location
    Regina, Sask.
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    4,213
    Was the trans in sport mode? As it will downshift from 6th to 5th at ~50% TPS at 221 kph. Just lower the shift speed table.

    Russ Kemp

  3. #3
    Tuner
    Join Date
    Sep 2011
    Location
    Germany
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    196
    not in Sport mode, shifter is on D.
    there is no point in the tables compare with the shift. what shift speed table you mean? i never done anything on trans tabes.