2019 Toyota Avalon: check engine light

Filed Oct 4, 2026 · Transmission · WA

What component or system failed or malfunctioned, and is it available for inspection upon request? Transmission. Yes. How was your safety or the safety of others put at risk? The UA80 eight-speed automatic transmission used in my Toyota is defective. There is a design flaw that causes excess heat inside the transmission to burn transmission fluid resulting in premature transmission failure as well as stalling and other dangerous situations. I also noticed significant noise from the vehicle’s transmission assembly. In addition, the engine RPM jumps high while the car struggles to accelerate or temporarily loses power. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? The check engine light came on a week ago, but no symptoms were exhibited at that time.

Filed Aug 30, 2026 · Brakes, Driver assistance · PA

On two occasions, 8 months apart, our car started braking on its own while driving in traffic. In both instances, the on-screen alerts indicated the LDA and simultaneously the check engine light. Neither time were we trying to switch lanes. In fact, the first time we were on a one-way street. In both instances, we were able to cruise over to a parking space before the car completely stopped avoiding a rear-end collision. Once we got in the space, we turned the car off and back on but it would not go forward or backward. We sat for 30 minutes or so, started it up and was able to get it home. We took the car to the Toyota dealership the next day. We got a call from the dealership in a few days stating the mechanics drove the car but the issue did not occur so we had to go in to the dealer and sign an authorization to allow access to the car's computer. About a week went by before we received a call stating they were waiting for an engineer to come in and diagnose the problem. Two weeks later, we got another call informing us the engineer would be delayed in getting to the dealership and asked if we wanted to pick up the car. Obviously, driving a car that we no longer feel safe in was not an option so we informed them to keep it until the problem was addressed. Weeks went by and we were not contacted so we sent a letter to the Corporate Office of Toyota. A case was opened but two weeks passed before we heard anything. We reached out and spoke with a representative who said they would have the initial rep call us. We never heard back so reached out again in a week and spoke with yet another rep who said there are two case numbers and the case is in progress and also told us there was "some kind of dispute" but we needed to speak with the case manager who opened the case and they would have her call back. Here we are nearly 3 months later and there has been no resolution. We've not heard back from the dealer in over a month and the Corporation in nearly 2 weeks.

Filed Jun 11, 2026 · Transmission · AR

The transmission needs to be replaced. My car has 75,146 miles and my check engine light came on while I was driving down the interstate. I took it to the Toyota dealership and they confirmed that the transmission needed to be replaced. I was told it would cost $8,600. I was looking for any recalls on my car and saw there were multiple lawsuits involving the transmission in my car and other Toyota and Lexus models. The primary lawsuits involve millions of vehicles equipped with the UA80 8-speed automatic transmissions.

Filed Jul 1, 2020 · Engine, Fuel system · 40,000 miles · WA

Tl* the contact owns a 2019 toyota avalon. The contact stated that while driving 35-40 MPH, the vehicle stalled without warning. The vehicle was restarted. Additionally, while the vehicle was idling, the vehicle hesitated with the check engine warning light illuminated. The vehicle was taken to toyota of tri-cities (6321 w canal dr, kennewick, wa 99336, (509) 736-9900) but was not diagnosed nor repaired. The vehicle was included in the federal safety agency campaign number: 20v012000 (fuel system, gasoline) however, the part to do the recall repair was not yet available. The manufacturer was not made aware of the failure. The failure mileage was 40,000. Parts distribution disconnect.

Filed Nov 14, 2019 · Driver assistance · 3,600 miles · TX

At 3600 miles, while driving on a city street, can check engine light came on plus all the other warning lights and malfunction messages about every sensor in the car, car lost power and acceleration, engine starts sometimes only. Dealer diagnosis was a full tank of e85 gas, gas station does not sell that and no any other complaint of e85. Did my own testing, doesn't seem like any ethanol in gas. I saved all the gas for further testing. I complained to toyota corp but they stood by and supported the dealer diagnosis. Gas station insurance carrier denied the claim. Even if it was e85 gas, this shouldn't have all this impact on this avalon and its computer system.