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Thread: 2017 f150 10 speed shift issue while using cruise control

  1. #1
    Tuner in Training
    Join Date
    Dec 2014
    Posts
    16

    2017 f150 10 speed shift issue while using cruise control

    hey guys, having a issue with my trans shifting in normal mode while using cruise control. if im using just my foot to control speed shifting is on point and good to go, the second i turn cruise control on it will down shift. for example if im holding steady at say 65 mph in 10th gear all is well, hit cruise control and it will down shift to 8th then go to 9th then 10th then repeat over and over until i turn cruise control off. this only happens in "normal" mode, tow and sport work fine. now i have found that if i hit cruise at 71 mph it doesnt down shift. looking at my shift schedules i am nowhere near the commanded down shift oss/rpm so not sure why cruise control makes it go goofy. i must be missing a table or something somewhere, has anyone ran into this and found a way to fix it? thanks in advance for any help!

  2. #2
    Tuner in Training
    Join Date
    Dec 2014
    Posts
    16
    ok i think i might have found whats causing it, at least i hope. i think i have my coast down map set too high in normal mode. i will lower it down and see if it helps and report back.

  3. #3
    Tuner in Training
    Join Date
    Dec 2014
    Posts
    16
    Ok it was for sure the coast down map. Not sure why it only effected shifting while in cruise control and worked fine when driving with foot. All is good now.