Pre-Collision and Cruise control are not working

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by artie, Nov 12, 2020.

  1. artie

    artie Member

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    I have a 2016 gen 4 model 3 and while driving this afternoon in San Diego, clear skies, cruise was on, all of a sudden cruise cuts out and up pops notice: pre-collision system not working and cruise control not working. (It didn't say "not working", but it was something that meant just that, I forget the verbiage).
    85,000 trouble-free miles, anyone have any knowledge of these issues?
     
    #1 artie, Nov 12, 2020
  2. hill

    hill High Fiber Member

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    just posted in another thread on codes, & code reading tools. Our readout (intermittent, so the dealer couldn't find it) on our scanner detected it, as well as what the apparent cause was ... a speed sensor. After they replaced it (under warranty) no more intermittent failures.
    even so ... it could be any number of other causes.
    .
     
    #2 hill, Nov 12, 2020
  3. alanclarkeau

    alanclarkeau Senior Member

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    Check the sensors are clean (windscreen and LOGO in the grille).
     
    #3 alanclarkeau, Nov 12, 2020
  4. The Professor

    The Professor Senior Member

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    Yeah I had the same issue just the other day. The glass in front of the camera had misted up in the cold weather. Fixed itself the glass when it was clear again. So stuff obscuring the camera can definitely cause this.

    SM-T813 ?
     
    #4 The Professor, Nov 14, 2020
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  5. Harters

    Harters Active Member

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    Yes, I think I saw that mentioned in the manual somewhere.

    I had my first occurrence of rain interfering with the CC the other day when I was driving in really hard rain. I have seen it mentioned in the handbook, but it was the first time in over 3 years actually experiencing it. It felt very odd when the car suddenly started speeding up, so I decided to turn it off until the heavy rain had passed (y)
     
    #5 Harters, Nov 15, 2020
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  6. alanclarkeau

    alanclarkeau Senior Member

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    Yep - in cyclonic rain - or severe storms, it's not reliable. Only had it ½ doz times in 4½ years though. Also immediately afterwards when there is a lot of spray on a fast busy wet motorway - spooks the DRCC.
     
    #6 alanclarkeau, Nov 15, 2020
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