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Strange cruise control behavior

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Xiidaen, May 17, 2005.

  1. Xiidaen

    Xiidaen New Member

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    So, I'm driving down the highway going to work, a little distracted when I notice that the cruise control isn't working. I have it turned on, but when I engage it, the car does not maintain speed.

    I turn off the radio and listen, and realize that whenever I take my foot off the gas (cruise control on or off) the ICE is revved up almost like I'm downshifting, I can feel the car braking as if I've downshifted, and the car slows rapidly.

    There are no warning lights or other indicators.

    When I get off the highway (in a mile or so) I power down and restart the car, and everything appears to work normally.

    Any ideas what that was? I'm due for my 5000 mile service in 500 miles, should I mention it then (a couple weeks tops) or deal with it immediately?

    Your advice greatly appreciated.
     
    #1 Xiidaen, May 17, 2005
  2. DanMan32

    DanMan32 Senior Member

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    Were you in B mode? Symptoms seem to match for B mode behavior. CC I don't believe works in B mode. Regen braking will be more significant and ICE spinning without gas will be added to the mix. On stops, ICE most likely will not shut down in B mode.

    You can go from D to B very easily, just push the shifter down without going left.
     
    #2 DanMan32, May 17, 2005
  3. Xiidaen

    Xiidaen New Member

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    I'm sure I didn't change into B - I can't say that the car didn't somehow get into B on it's own.
     
    #3 Xiidaen, May 17, 2005
  4. jrfaris

    jrfaris Member

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    I think DanMan is right. Similar situation happened to me. Cruise control didn't seem to work and car wanted to decelerate. After a few miles I noticed it was in B. I was able to just shift to D and everything was ok again. I realized that I had inadvertently hit the shifter when reaching for something in the back and apparently shifted to B. Very easy to do.
     
    #4 jrfaris, May 17, 2005
  5. Xiidaen

    Xiidaen New Member

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    Ok, I'll check that -- maybe even do it purposely and see if the behavior matches. Thanks for the help!
     
    #5 Xiidaen, May 17, 2005
  6. bruceha_2000

    bruceha_2000 Senior Member

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    2018 Prius Prime
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    Prime Advanced
    CC definately willl NOT engage in 'B' mode. It is mentioned in the manual somewhere. Like others, I once forgot I was in B mode after coming down a steep hill and couldn't figure out why the CC wouldn't engage when I got on the flatter section.

    I would only be concerned if you ABSOLUTELY POSITIVELY know you didn't put it in B mode on purpose or or by accident. It shouldn't shift there by itself.
     
    #6 bruceha_2000, May 17, 2005
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