Part is the coolant bypass valve. Toyota has been taken to court but dealership claims now that I’m over 100k miles I can’t do it. There was also a second part about 10 years but I wasn’t clear on the details of the outcome. Toyota has acknowledged this issue in court but failed to do so at the customer level in my case. engine light came on at 97k and now I’m at 104k which is over that 100k mark. Issue is I’ve only take my car to Toyota for repairs. They have known about this but failed to repair or notify me of it. I would have immediately brought my car in at 97k if. I had known. This puts not only me but my 3 kids and entire family at risk every time i drive. This is known to the dealership and they been taken to court for failures to notify customers of this known defect. It’s been inspected by Toyota the last time I took it in about a week ago at 104k miles.

Source: NHTSA complaint ODI #11755244 · view all complaints for this vehicle at nhtsa.gov

DESIGN FLAW & SAFETY RISK: Toyota critically mismatched the standard battery to the vehicle's electrical charging profile; an AGM battery should be specified from the factory. Engine programming drops alternator voltage during cruising, deeply discharging the battery, and forces high-voltage surges (15V+) into it during deceleration. Because standard batteries cannot handle these rapid recharge loads during deceleration, the internal thermal load routinely overheats and boils the liquid electrolyte, even when brand new. This continuous boiling vents volatile hydrogen gas and discharges corrosive battery acid inside the engine bay. This structural flaw culminated in an immediate safety hazard when the battery physically exploded under the hood, creating a severe risk of engine compartment fire, chemical acid burns, and complete vehicle electrical blackout in active traffic. COLLATERAL DAMAGE & HISTORY: The chronic discharge and boiling of highly corrosive battery electrolyte severely damaged and corroded surrounding critical vehicle components. The acid completely corroded the transmission mount, the metal battery holder restraint, and the body paint. Furthermore, the corrosive boil-over burned off and destroyed several electrical connectors, plastic shrouds, plumbing hoses, and sections of the primary engine wiring cable harness. Since owning this 2020 Toyota Corolla, the vehicle has suffered systematic electrical degradation, requiring a full battery replacement at least once every single year. The exploded battery could not be safely retained due to its hazardous, ruptured state. WARNINGS & INSPECTIONS: No dashboard warning lamps, battery alerts, or diagnostic codes were triggered on the display prior to the physical battery failure. The rupture and electrical blackout occurred instantaneously. The vehicle has not been inspected by police or insurance representatives as no crash resulted directly from the blast.

Source: NHTSA complaint ODI #11755366 · view all complaints for this vehicle at nhtsa.gov

I am having a problem with my 2020 Toyota Corolla's brakes. I live in [XXX] . In the winter when the car is cold the brakes work normally. When the car has been driven for a while, the car has warmed up, and the brake fluid has thinned, the brakes behave abnormally. When I stop at a red light, after 20 to 40 seconds, the brake pedal slowly drops towards the floor. My understanding is that this could indicate a problem with the master brake cylinder. My fear is that there could be a sudden failure of the cylinder causing an accident. I brought the car to Rudy Luther Toyota in Golden Valley. When I brought the car in, it was warm and the brakes were malfunctioning. Unfortunately, they let the car sit for several hours, the brake fluid cooled, and the mechanic was unable to duplicate the problem. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Source: NHTSA complaint ODI #11719920 · view all complaints for this vehicle at nhtsa.gov

I was driving normally to work and the vehicle stalled without warning and became difficult to steer. The dashboard displayed “engine stopped, steering power low”. The vehicle was stalled in the middle of the roadway and could not be restarted for 10 minutes. This was a very dangerous way to stop and then not be able to restart. People had to get out of their vehicles and help me push it out of the roadway. After 10 minutes the vehicle started and drove normally without any issues. The battery and alternator tested good. The mechanic can not find anything wrong. I am scared to drive the vehicle now and have an accident due to this incident.

Source: NHTSA complaint ODI #11695131 · view all complaints for this vehicle at nhtsa.gov

When I start the car it informs me that my seat belt is not being worn. Even though it is. Then a message appears on my dash that says "Srs airbag system malfunction visit your dealer" My family's safety is at risk if ever involved in a accident with no airbag deployment.

Source: NHTSA complaint ODI #11697356 · view all complaints for this vehicle at nhtsa.gov

Windshield Wiper Intermittent setting stopped working, and wipers no long return to their home position. This appears to be a common issue with Toyota. When driving in the rain, the wipers will freeze in the up setting, which is very dangerous for it to occur during heavy rain on the highway causing visibility issues. No warnings of any kind given, the wiper switch appears to just go bad, or wear out over time.

Source: NHTSA complaint ODI #11736152 · view all complaints for this vehicle at nhtsa.gov

The CV joint, there is a clicking sound when sharp turns are make to include U-turns. Spoke with a mechanic and was instructed to reach out to the dealership and check for recall on it. I did see any but I see a Technical Service Bulletin ( TSB-0106-20) for 2015- 2021 Corolla models regarding a potential clinking noise during sharp turns and u turns. This may have started three months ago. It is more noticeable now that I am driving more.

Source: NHTSA complaint ODI #11764378 · view all complaints for this vehicle at nhtsa.gov