2019 TOYOTA AVALON Electrical System Problems

The contact owns a 2019 Toyota Avalon. The contact stated that while driving at an undisclosed speed, several unknown warning lights illuminated, and the engine seized. The contact stated that a good Samaritan attempted to start the vehicle, but the vehicle failed to restart. The contact waited for thirty minutes and stated that while attempting to start the vehicle, the vehicle restarted. The vehicle was taken directly to the dealer. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. In addition, the contact stated that the vehicle had previously experienced several failures since July 2025. The contact stated that the vehicle was taken to the dealer several times, and the oxygen sensor, the oil light sensor, the ignition coils, and the fuel pump extension were replaced. The contact stated that the vehicle had caused the contact anxiety, and the contact was fearful of driving the...

When starting the vehicle, an extremely high pitched noise is emitted from the speakers. This high pitch seems like its comes out full volume out the speakers. Ear piercing noise leaves my ears ringing every time.

I purchased this Vehicle as a Preowned Used Certified from The Toyota dealership The car has broke down 4 times for the same exact ISSUES All the lights will come on and it will say take to the dealer for Service June 8 2024 purchased the Car. November 2024 in the shop ( sensor ) December 2024 in the shop ( sensor ) NO CHARGE July 8, 2025 car had to stay overnight ( ignition coil $300 ) Service told me the Mechanical Warranty Expired in June. 8 days later July 17, 2025 Broke down on the highway I was stranded for 5 hours had to pay for a partial Tow out of miles. Its been 6 days no CAR. I DONT FEEL SAFE IN THIS VEHICLE and I Think it has a Defective System. I am locked into a Contract with a Vehicle that keeps Breaking down. I have...

After troubleshooting, the issue with my car cannot communicate with my mobile app through Toyota remote connect, cannot update vehicle software, and after a $130 diagnostic fee, the dealer states the DCM module is bad and needs replacing. My question is this is a safety issue, correct?

When starting the vehicle, an extremely high pitched noise is emitted from the speakers. The safety of my young child is at risk every time I start the car because this could cause irreparable hearing loss. This is a known issue across many Toyota models as I've found through online forums. Toyota wants $1,200 to fix the DCM Module when it is a manufacturing issue and not caused by the consumer.

A year ago my 2019 Toyota Avalon started displaying a message that the RCD (rear camera detection) was unavailable. I tried working with the dealership that sold me the car, but they ignored me. I went to another Toyota dealership and they said it would cost approximately $2000, but could not guarantee it would fix the issue. I’ve seen online that 1000’s of Toyota owners with the same system have had similar problems, and Toyota frequently responds with, “It’s a rolling computer, and very advanced.” Some were fixed by recalibration, but many have a more serious problem. All the stories are only the people that have posted about it. It’s probably Toyota’s biggest problem. My car was under warranty when it began, but health issues and restrictions kept me from getting the attention of the general manager since I was ignored by others. I feel this is serious enough and...

The car emitted a very loud, high pitched sound, lasting several seconds when starting the vehicle, which was very painful. At the same time, red and green lights are seen flashing a few times next to the SOS button. This has happened twice in the past month.

2019 Toyota Avalon XSE with 41,400 miles. Complete failure of the Climate Control Panel. No buttons or lights would work, resulting in lack of any fan, heat, air conditioning, window defroster, mirror defroster or seat heat. Found no fuses blown. On one occasion since then both seat heat lights came on indicating full heat but did not produce any heat. Two days later Panel began to work normally for a 1 hour drive. Later this day there was another complete failure of the same panel. Took car to dealership the next day and panel functioned normally enroute. When dealership diagnosed the problem the Climate Control Panel had failed again and the problem could not be duplicated. No trouble codes were stored in the system. They performed a master reset of the system thinking an update may have been corrupt. Panel worked when leaving the dealership later this day. The next...

The sunroof of my 2019 Toyota Avalon is defective. It is available for inspection upon request. My safety, as well as the safety of my passengers, has been put at risk. My problem has been confirmed by Sheehy Toyota of Fredericksburg. No warning lamps or messages to indicate sunroof problem. The driver side of my sunroof keeps clogging. I first took my vehicle to Toyota Sheehy of Fredericksburg on 1/3/2023. Sunroof tray was found to have a buildup of organic detritus, causing drains of sunroof tray to be clogged and allowing rainwater to spill over into interior. Sheehy technician cleared the sunroof tray and drains of organic material. Drains were now flowing properly. Technician claimed that sunroof would not have to be drained for at least two years. There was standing water and a heavy mildew smell in the car. Sheehy refused to clean/drain carpet of water. I took it...

After starting car, from being parked in parking garage from 8am-5pm, the Pre Collision warning system light turned on. Vehicle currently has 20k miles on the odometer. There are numerous records in the car's onboard history of this device failing during car startup. Drove home, started next day with no incident. System is unreliable. According to the Infotainment system, the car seems to report the failure every few months.

THIS VEHICLES BLIND SPOT MONITOR ON THE PASSENGER SIDE IS NOT OPERATIONAL AND DOES NOT SHOW VEHICLES IN THE BLIND SPOT ON THE MIRROR OVER 70% OF THE TIME GIVING THE DRIVER A FALSE SENSE THE LANE IS CLEAR. IT APPEARS THE SYSTEM GETS WORSE THE LONGER YOU DRIVE AND ALMOST NO USABLE WHEN DRIVING OVER 40 MILES. THE DRIVER SIDE BLIND SPOT MONITOR SYSTEM WORKS AS IT SHOULD. UPON SOME RESEARCH ON LINE, IT APPEARS THIS IS A COMMON ISSUE AND TOYOTA INDICATES IT WORKS TO SPECS, BUT BASED OFF THE FACTORY MANUAL DOES NOT.

REPORTED THIS TO DEALER. THEY COULDN'T FIND ANYTHING WRONG AT THE TIME. KEEPS HAPPENING : BLIND SPOT MONITORING AND CROSS TRAFFIC ALERT MALFUNCTION ALERTS