2020 Toyota Corolla Problems

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.

A message came on the screen saying “engine maintenance required” and it’s not going away. Upon doing a google search, there is a common failure in the cooling system for these cars reported by a lot of owners.

FAILED COMPONENT & AVAILABILITY: The manual transmission Concentric Slave Cylinder (CSC) failed internally. Due to caustic hydraulic fluid contamination and severe system pressure loss, I had to replace the internal CSC unit, the clutch disc, the pressure plate, the flywheel, the master clutch cylinder, and the hydraulic clutch lines. The failed components have been retained and are available for inspection upon request. SAFETY RISK: The plastic housing of the OEM slave cylinder cracked internally, spraying caustic hydraulic brake fluid inside the transmission bell housing and completely coating the flywheel, pressure plate, and clutch friction disc. This caused an immediate, sudden loss of hydraulic pressure, forcing the clutch pedal to drop and stick flat to the floorboard. This put my safety and the safety of others at extreme risk, as it suddenly prevented me from disengaging the clutch, shifting gears, or safely dropping the vehicle into neutral while driving in active traffic.CONFIRMATION & REPAIR: A certified Toyota dealership diagnosed the issue and issued an unaffordable repair estimate of $4,800 to fix this recurring manufacturer defect. Because of this extreme cost, I was forced to drop the transmission and perform the entire rebuild myself. The total out-of-pocket cost just for replacement parts was $3,200. The vehicle has not been inspected by police or insurance representatives as no crash resulted. WARNINGS & MILEAGE SYMPTOMS: There were no prior dashboard warning lamps, error messages, or clear physical indicators before either failure occurred. The loss of clutch pedal pressure happened instantaneously. This vehicle has suffered this catastrophic internal failure twice: the original factory-installed unit (part number 31400-19025) failed prematurely at 59,000 miles. The updated replacement part (superseded part number 31400-19027), which suffers from the exact same defective plastic composition, failed again just 40,000 miles later.

Design issue: The 12th-generation (E210) Corolla manual transmission utilizes a CSC unit containing plastic/ABS components that owners and forum communities frequently cite as a weak point prone to premature leakage and mechanical failure. This occured to my corolla on a roadway and presented a severe safety hazard.

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.

The contact purchased a 2020 Toyota Corolla. The contact stated that they discovered a mileage discrepancy after the purchase. The vehicle was a private sale on Facebook market. At the time of purchase, the vehicle mileage was 52,000. It was later discovered that the vehicle’s title mileage was 132,000. The contact stated went the DMV, and he discovered the mileage 132,483.

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)

Clutch slave cylinder started leaking leading to a sticking clutch pedal, making it difficult to engage the transmission with the engine, and a lower brake/clutch fluid level which could have caused braking issues if the fluid got too low.

The current recall on this car (passenger front seat weigh sensor issue) has been going on for too long (since 2023). Based on the recall info, i have not been able to drive with anyone sitting on the front passenger seat.

My airbag sensory notifications keeps coming on. When I start my car normally it isn’t on but once I start driving the notification will come on along with the ding noise it makes when you don’t have on a seat belt. I notice there was a recall on this issue for the later model Corolla and wanted to see if possibly this could be considered for the 2020 Corolla’s.

The contact owns a 2020 Toyota Corolla. The contact stated that while at a red light, the vehicle shut off with the check engine and several other unknown warning lights illuminated. The vehicle restarted after several attempts. The vehicle was taken to an independent mechanic and the failure was duplicated. The mechanic retrieved DTC: P1603; "Engine Stall History" (ECM recording an unexpected engine shutdown or a communication error with the Transmission Control Module (TCM). The mechanic associated the failure with NHTSA Campaign Number: 20V682000 (Fuel System, Gasoline) and referred the contact to the dealer for assistance. Several dealers were contacted, and the contact was informed that the VIN was not included in the recall. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 59,000.

Fuel pump system failure causing vehicle warning lights to come on and not turn off, affecting vehicle performance for going up hill as well as vehicle completely shutting off in middle of road . Major safety hazard

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.

The wipers are turning on randomly by themselves, even when the control switch is set to the “off” position. This has occurred multiple times and happens without any input or activation from me. The issue appears to be intermittent but persistent, and it raises concerns about a potential electrical or control system malfunction.

The contact owns a 2020 Toyota Corolla. The contact stated that while driving approximately 10 MPH and making a left turn, the Forward Collision Avoidance system activated ad the vehicle stopped independently. The contact stated there was no warning light illuminated. The contact stated that the braking function resumed, and the contact was able to continue driving. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the Forward Collision Avoidance was functioning correctly and there were no failure found with the brakes. The vehicle was not repaired. Additionally, the contact reported that the vehicle had started to shake abnormally while driving at speeds under 40 MPH. The contact stated no warning light was illuminated. The contact had not taken the vehicle back to a dealer or mechanic to be diagnosed. The manufacturer was not informed of the failure. The failure mileage was approximately 116,000.

Fuel pump system failure causing vehicle warning lights to come on and not turn off, affecting vehicle performance for going up hill as well as vehicle completely shutting off in middle of road . Major safety hazard

The contact owns a 2020 Toyota Corolla. The contact stated that the front driver's side fender liner above the tire detached while driving at approximately 55 MPH. After inspection, the liner was missing. The vehicle was taken to the local dealer, where it was diagnosed that the fender liner needed to be replaced. The vehicle was not repaired. The manufacturer was contacted. The failure mileage was approximately 38,650.

The contact owns a 2020 Toyota Corolla. The contact stated that after rainy weather, the front driver's and passenger's doors leaked water while opened. The dealer was made aware of the failure; however, the vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 30,000.

Front is very low. Right side is tilted without anyone inside. Very unusual tire wear on inside edges of both front tires. Immediately after starting the engine the front ricked side took side and made loud noises.

I had to replace all four tires before reaching 40k miles. Brakes needed to be fully replaced with only two years of driving it. AND Engine Maintenance Light on for an issue with the coolant bypass valve, not covered under warranty. This is causing issues with the engine, when driving even at 25 miles per hour or at 65 the car sounds like its dragging or forcing itself, the wheel shake & car feels unbalanced even with a tire alignment. Overall i give the car a 2.5 out 5 star in performance. The body of the car is so fragile and made by very cheap materials. Spending a fortune on this vehicle and it hasnt even reached 60k miles yet.

At 4 years and 1/2 old car 2020 Corolla XSE an Engine Maintenance Required SEE DEALER light turned on. Did diagnostic with OBD 2 scanner at two locations auto body shop and Uto zone. Nothing appears. It is in fact a NEEDED future recall since thousands if not more people have encountered the same. It is a Coolant By Pass Valve. Cost is only $99.53 + tax at dealer. Problem is that should be under warranty or extended warranty or recall. Dealer likes to charge $800 (180-200 for diagnostic, $110 part, $400 labor. Part only takes 30 minutes to install. I should be able to buy at dealer for $110 and have them install for free or pay 30 minutes of work time = $85. 1 hour is about $175. So instead of trying to be billed $800 I should only be billed for $85 labor (30 minutes) + $110 part = Brand total of $105 USD. My daughter [XXX] and I, [XXX] (dad) bought the car at Longo Toyota El Monte, CA 91731. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The system belt sensor kept beeping even though I have on seat belt

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.

after shortly pumping gas, I received a alert on my car that I needed to check my fuel cap, after checking fuel cap I proceeded to drive on the highway during this time a multitude of sensors started to go off on my car, and it started to drive weird there were light such as my interlock, being deactivated, parking, brake, deactivated, malfunction of VSC, collision deactivated. Then suddenly while driving at an accelerated speed, and trying to slow down, my engine turned itself off, and I was not able to re-crank my car. There is an active recall with Toyota for the fuel pump, which I was told by Toyota was the issue, but due to my VIN not being associated they would not repair as a recall

All FOUR Goodyear Exhilarate tires cracked and separated from the sidewall on the interior side of the tire. i have one of the four tired saved and available for inspection. With the tire separating at the bead and sidewall on the interior side completely away from the butyl liner inside of the tire, it was a mere miracle that the car actually made it to the repair shop without blowing out, causing an accident which could have been a fatality or at least a very bad accident. The tires were taken to a Goodyear service center and after talking with corporate said it was nothing they could do and sent me on my way. By chance the car was going on a trip and wanted to get the tires rotated and the oil changed beforehand , had he not chosen to do such the outcome could've been terrible. There wasn't any warning of tire failure or loss of air due to the separation. Again, it was only by chance that this was caught and ALL FOUR tires replaced . The tire dealer stated that he hasn't ever seen ALL FOUR completely separate at the exact same location all the way around the tire. It is without a doubt a manufacturing error , old /burnt rubber used in the tire making process.

Unknown, I can send photos. it comes with new Toyota Description of Complaint Please provide a narrative which describes the problem(s) or concern(s) you are having with your vehicle. Toyota put a cheaper, lower quality tires for my car, it damaged my front bumper when we go curve roadon CA state. I asked Toyota for warranty bumper 2020, they said "you made it". After I replace the badtires with Costco tires, no more bumper issue as before, so I know the reason. I , Costco tire service made3 parties to Tire Inc Yokohama. Yokohama agreed to refund, but need go with Toyota, Toyota rejected.First tire was down March 16, 2020 with 797 miles, the second down June 22, 2020 with 1608 miles, thirdtires down Dec 17, 2020 with just 2745 miles and 4th tire down 12225 miles on April 14, 2023.Specific Arbitration Defect(s) Please summarize the specific defect(s) you would like Arbitrator to address. Please be as succinct aspossible. When I purchased, I asked the Hamer Toyota, "Are your tires good? I saw online people claimed Toyotaput bad quality, cheaper tires on new cars", the selling man said"No, they are good as cars, online mightbe posted by Honda or others". I said"if bad, you will refund me tires cost". He said "Of course". I can email you more documents and photos. Yokohama agreed to refund, but need Toyota to refund, it comes with 5 years warranty. But Toyota did not refund me. Thanks.

THE REGULAR HEADLIGHT BEAMS DO NOT LIGHT UP THE ROAD. THEY LIGHT HALF OF THE ROAD. THE ROAD IN FRONT OF THE DRIVER IS COMPLETELY DIM. THE ONLY WAY TO MORE THAN A CAR LENGTH IN FRONT OF THE CAR IS TO ACTIVATE THE HIGH BEAMS. EVEN THEN YOU ARE LIMITED ON HOW MUCH LIGHT THE HEADLIGHTS PUT ON THE ROAD. I AM BLINDED BY ONCOMING CARS. I CANNOT SEE DEER WHEN THEY JUMP OUT FROM THE SIDE OF THE ROAD. I CANNOT READ ADDRESS SIGNS THAT ARE BASICALLY REFLECTIVE AND IN FRONT OF THE CAR ON THE ROAD UNLESS I DRIVE DIRECTLY UPON THEM AND SHINE THE HIGH BEAMS.

THERE IS A DEFECT TO THE LEFT HEADLIGHT OF THIS VEHICLE CAUSING THE LIGHT FROM THE LOW BEAM TO BE BLOCKED BEYOND A DISTANCE OF 60 FEET FROM THE FRONT OF THE VEHICLE IN A SPECIFIC PATTERN TO SUGGEST THAT IT IS THE RESULT OF AN ABBERASION OF THE LENS ASSEMBLY. THE DEFECT IS PRONOUNCED ON UNLIT ROADWAYS BECAUSE IS SEVERELY AFFECTS THE ABILITY OF THE OPERATOR TO IDENTIFY THE LEFT HAND LANE MARKINGS AND ANY ROAD SIGNS. THE LIGHT DISAPPEARS IN A "V" PATTERN OF APPROXIMATELY 130 DEGREES FROM WHEN THE INITIAL SOURCE OF LIGHT IS PRONOUNCED UP TO A DISTANCE OF 60'. NOTE THAT THE RIGHT HEADLIGHT SUFFERS NO LIGHTING LOSS AND THE FIELD OF VISION LEFT TO THE LEFT OF THE UNLIT PORTION IS WELL LIT. GATEWAY TOYOTA (THE SELLING DEALER) AND PER THEIR SERVICE MANAGER, TOYOTA USA DESCRIBES THIS AS BEING A NORMAL CHARACTERISTIC OF THIS VEHICLE AND ALL VEHICLES WITH PROJECTOR-STYLE HEADLIGHTS PER "SVMSS" GUIDELINES. AS A FORMER VEHICLE DEFECT INSPECTOR, MOTOR VEHICLE AND HEAVY EQUIPMENT CAUSE AND ORIGIN LOSS INVESTIGATOR, NJ STATE SAFETY AND EMISSIONS INSPECTOR, ASE MASTER-CERTIFIED COLLISION REPAIR TECHNICIAN, ASE-CERTIFIED AUTOMOTIVE REPAIR TECHNICIAN, MERCEDES-BENZ CERTIFIED SERVICE, PARTS AND COLLISION DIRECTOR AND TESLA-CERTIFIED COLLISION ESTIMATOR HAVING OVERSEEN THE SUCCESSFUL REPAIR OF THOUSANDS OF FRONT END IMPACTS REQUIRING HEADLIGHT RE-AIMING AND PROGRAMMING AS REQUIRED, I CERTIFY THAT THIS IS A SAFETY DEFECT UNIQUE TO THIS VEHICLE THAT CONTINUES TO AFFECT ITS SAFE OPERATION WITH NO ASSISTANCE FROM TOYOTA USA IN REACHING A RESOLUTION.

The car seat base does not install properly with the seat belt method nor the anchor method. The edge of the base still flips up if the part secured by the seat belt is properly tightened. No level infication

The contact owns a 2020 Toyota Corolla. The contact stated that while driving at an undisclosed speed, the vehicle emitted an abnormal slushing sound. There was no warning light illuminated. The contact stated that upon parking and inspecting the vehicle, he noticed that the abnormal sound was coming from the front driver's side door. The contact then moved each door of the vehicle from side to side and noticed that the failure occurred on the front passenger's side door and the front and rear driver's side doors. The vehicle was taken to the dealer on several occasions and the water was drained from the doors; however, the vehicle was not diagnosed. The manufacturer was notified of the failure and informed the contact that they would cover the repair of the vehicle. The contact stated that it had been two months and the vehicle had not been diagnosed or repaired. The contact stated that he was concerned for his safety as he was a disabled veteran. The failure mileage was approximately 85,000.

Front is very low. Right side is tilted without anyone inside. Very unusual tire wear on inside edges of both front tires. Immediately after starting the engine the front ricked side took side and made loud noises.

The contact owns a 2020 Toyota Corolla. The contact stated that while driving at an undisclosed speed, the clutch failed to operate as intended. The contact stated that the clutch seized, and the RPM increased. No warning lights were illuminated. The vehicle was taken to the dealer; however, the failure was not duplicated. The contact stated that the failure reoccurred. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 90,330.