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2017 Toyota Highlander and Sienna Transmission Problems

Discussion in 'Tech Help' started by OishiiJPN, Jan 15, 2018.

  1. OishiiJPN

    OishiiJPN Administrator

    Hearing reports of the new 8 Speed transmission transmission in the 2017 Highlander and Sienna having issues with whine noise and/or shift (movement) issues. Something possible with the final drive pinion hasn’t been stacked and is coming loose. If you have an issue with your vehicle, please let us know.
     
  2. David123

    David123 Guest

    I have a 2017 Toyota Sienna. At 5500 miles the transmission started making a banging sound and the car shook as I came to a stop while driving. Dealer informed me transmission needed to be replaced. It took 25 days becasue it was on back-order. Car has been driving ok but I only go the car back about 5 days ago
     
    Lewis likes this.
  3. Lewis

    Lewis Moderator Staff Member

    Thank you for sharing your story. I’ve seen quite a few of these going bad.
     
  4. David123

    David123 Guest

    Do you know if any of these affected Sienna minivans have qualified as lemons and been repurchased by Toyota?
     
    Lewis likes this.
  5. Chad damon

    Chad damon Guest

     
  6. Chad damon

    Chad damon Guest

    YES! 17 highlander limited platinum, 6 months old with 9500 miles on it transmission failed. Waited weeks for new transmission due to backorder. New trans was installed and was worse than the one that failed. Has been at dealership for over 30 days and is one of 4 sitting there with the same issue. Toyota engineer came in to work on it and found that dealer improperly installed replacement transmission, had to remove and reinstall. Just got it back today and it still is not right, it hesitates when starting from a dead stop and is very sluggish overall compared to what it was originally. Going back to dealer for 4th time tomorrow. Lemon law requirements have been met and I think I’ll be heading that direction.
     
  7. Leech_Lake

    Leech_Lake New Member

    Our transmission failed at 8,253 Miles while my wife was at a stop light.
    The vehicle was hauled to local Toyota dealer on a flatbed & sat at the dealership for 52 days. We were told by dealer that a "new" transmission was back-ordered from California. After picking up the vehicle I noticed the work order stated part number 30510-48600-84 "REMAN ATM" and "CORE RETURN".
    The day after picking it up I drove the vehicle and excessive power train noise was present. Vehicle went back the the shop & they replaced both front wheel bearings at 8,392 miles and it sat in the shop another 3 days.
    Toyota corporate has been less than helpful & we're currently going through the lemon law process.

    2017 XLE 4dr SUV AWD (3.5L 6cyl 8AT 8 spd transmission)
     
  8. Ken

    Ken Guest

    2017 Highlander with 7600 miles on it and the whinning noise at 40 mph. Brought to the dealer twice for diagnostics and Toyota says it needs a new tranny but its on back order. More of the same.
     
  9. Lewis

    Lewis Moderator Staff Member

    None that I have been involved with. It’s disheartening to hear the stories below and sounds like the Technicians performing the repair weren’t the best. Comebacks, as we call them, are very inconvenient for Owners. We will have to wait and see how this plays out. I think Toyota will get a handle on it quick enough.
     
  10. Danmac

    Danmac Guest

    My '17 Highlander Limited just lost a tranny. high pitch noise - pulled into dealer (glad I was in town)
    Fortunately there was one in Kentucky and is on the way. Sure does disappoint me...only 11K miles
    on it and mostly hiway/freeway miles. It better be right after I get it back! Won't buy another one.
    Lease up in 2 years - bye, bye!
     

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