2019 Toyota Highlander electrical system problems

“My 2019 Highlander was driving totally normal, when all of a sudden the transmission started slipping and then would no longer accelerate. I was on a windy back road in Alaska with no service, so after letting it sit for a bit I tried to drive it again. It then drove maybe 1/2 more miles before slipping completely and no longer accelerating. No check engine lights came up. I got it towed to my house where a mechanic took a quick scan and said there was a number of transmission codes popping up.”

“My transmission is now missing the 3rd gear and left me and my kids stalled in traffic as I was turning in oncoming traffic. Toyota dealership confirmed that was the problem upon inspection.”

“Sporadically, when starting up the vehicle, from the overhead console, it emanate a loud, ear piercing sound that is painful to one's ears. Apparently, this is a KNOWN issue with 2019 Toyota Highlanders in the Limited Platinum trim level. This issue has been presented to the dealership numerous times (DARCARS Toyota Frederick) with their claim they could not recreate the issue. I have provided video evidence but still no action was taken. Now out of warranty, it occurs more frequently now with this piercing noise.”

“The contact owns a 2019 Toyota Highlander. The contact stated that while driving approximately 30 MPH, the vehicle stalled; the contact shifted the vehicle into park(P) and restarted the vehicle for the vehicle to return to normal operation. No warning lights were illuminated; however, the “Auto START/STOP Failure” and “See Dealer" messages were displayed on the instrument panel. The failure reoccurred on several occasions. The vehicle was taken to a dealer, where it was diagnosed, and determined that the wiring harness needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 86,530.”

“Upon expiration of the SOS Subscription the DCM creates a loud feedback noise that goes through the passengers speaker and is causing hearing loss every time the vehicle is turned on. Has been documented many times on Reddit from other owners of 2019 highlanders”

“Radio head unit keeps resetting. While using navigation. Disturbing driving. Something it will continually loop resetting. Can not determine consistent cause. Would like a free replacement and or upgrade including navigation”