The coolant bypass valve in some Toyota models has been malfunctioning recently and has become a common issue. Dealer confirmed that this was the issue per attached diagnostic report/invoice copy. Costs were >$800 to repair the issue for a <$100 part and 30 minutes of labor. The "Engine Maintenance Required" warning was visible in the display. Unsure as to the short or long-term effects of this malfunctioning part, but as it's related to the cooling system of the vehicle, it may trigger other more serious issues.

- Miramar, FL, USA

Around 40k miles I received an Engine Maintenance Required warning. After some research Engine Maintenance and Engine Service Required are two very different indicators. I received and P2681 code meaning the electrical coolant bypass valve had failed unfortunately one can-??t tell if it-??s stuck shut or open this could lead to one-??s care over heating and or damaging one-??s engine. After some research I-??ve come to find out most 2020-2024 corollas have been having this issue tends to happen about 30-50k miles

- Perris, CA, USA

Coolant bypass valve failure. Replacement part carried the same defect.

- Pfluggerville , TX, USA

In the past week at 30,700 miles, my 2020 Toyota Corolla "Engine Maintenance light; see dealer" service light appeared on the dash. Through talking with a Toyota dealer, they are aware of this issue with Corollas, Camrys, and Rav4's. It is an engine coolant bypass valve, and appears to be faulty in many vehicles according to youtube videos, google, and Toyota service. Perhaps this needs to be a recall? Also, the dealer wants almost $800 to repair even though many people do it on youtube in under an hour. Parts are less than $200, and 1.5 hours of labor do not add up to $800.

- Duncan, SC, USA

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.

- Carlisle, PA, USA

Engine maintenance light came on and found out I had replace coolant bypass valve. Apparently this is an issue many 2020 corollas and RAV4 have issues with and need replacement. There-??s no reason or rhyme as to why it becomes faulty but should be recalled as many people have the same issue and dealership are aware of this issue.

- Hollywood, FL, USA

Just bought a used 20 Corolla SE and put less then 500 miles on it and got a "maintenance required return to dealer" notification on the dash and a warning message in my information screen via infotainment system. Dealer said they got nothing via a scan. The issue is the Coolant Bypass Valve. I reset the light on the dash and restarted my car with air off and it did not come back on. The second you turn on the air (the A/C in particular) the light immediately popped back on along with a new warning message. I've looked around and there's literally THOUSANDS of people reporting the same issue all on vehicles between 15k and 100k miles. The dealers also charge at least $600-$1100 to remedy this all too common issue as they will tell you it is not covered under warranty. I'm unsure of what promised damage to the vehicle could be but I know for a fact it's not nothing. Everyone is dumbstruck with how many people have this issue and there is still no Recall on this clearly terribly made Coolant Bypass Valve. It seems to apply of us that this is just a cash grab for Toyota

- Fairfield, CA, USA

Coolant bypass valve problem. Engine maintenance required light has come on. This part affects several other components of the vehicle. Toyota dealership wants to charge $800 to fix it. It is a very common issue faced by many customers of 2020+ Corollas and 2019+ Rav4s. All dealerships with service departments are aware of this issue.

- Corona, CA, USA

Coolant leak due to engine defect from manufacture.

- Anderson , SC, USA

I have only had the car for a year and a half, and I have already had to replace the battery which was less than 2 years old, all 4 tires (2 at 40000 miles and 2 at 48000), and now the engine wiring harness somehow got severed and has to be replaced which is almost $6k repair!

- Apopka, FL, USA

Code P2688115 engine maintenance required sign turned on at around 41000 miles. Other people having similar problems with coolant bypass valve. Suspect that coolant bypass valve safety standards might be at fault.

- Elgin, IL, USA

Newly bought vehicle won't start when key is turned in ignition. Problem is a repeat problem and vehicle was repeatedly towed to dealer (Gosch Toyota). Dealer said there is nothing wrong with the car. Dealer admits he can't reproduce the problem and paperwork I've obtained from them indicates they may not have even tried. Car has major safety issue and is unreliable which is an explanation falling on deaf ears at Gosch. So it remains parked in my driveway. I refuse to put anyone in my family into it because of obvious safety issues. Car is totally unreliable if one can't rely on it to work.

- Hemet, CA, USA

We rented a 2020 Toyota Corolla from Hertz at the McCarran Airport Las Vegas NV and almost past out while driving due to Carbon Monoxide poisonings. My wife was sick 3 out of the 4 days while this auto was being driven in our possession. At first our sickness was thought to be motion sickness or maybe from something we ate. It wasn't until we drove this car out of town when we both my wife and I started getting very sick weak dizzy and vomiting. We tried to drive out to the Hover Dam but stop about 10 miles short. After a brief rest we decided to had back to Las Vegas. Just outside of Las Vegas I could hardly breath and had all the same symptoms previously stated. Luckily I was able to get out of traffic and pulled off the high stopping at the first place I was able to pull into. I believe that If I didn't do so I would have passed out and may have caused an accident. Roadside assistance stated this is a common thing in Toyota's. My concern is how many of these cars are rentals and how many people may have been in accidents and the driver blamed? Please google 2020 Toyota Corolla Carbon monoxide poisoning for morning formation. Feel free to call me at [XXX] for more details. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6

- Linda, CA, USA

I was waiting at a stoplight with my foot on the break waiting for it to turn green. I turn the wheel to make a left turn and put my foot on the gas and the car diedall the buzzers whistles and lights were flashing on the dashboard.. I was able to shift the car to park and back to drive but nothing happened I was in the middle of traffic on a busy street and was just getting ready to call the tow truck when I decided to turn the car off. When I turned it back on it was fine and I was able to turn left. That happened to me twice on different occasions. Third time I was turning into a driveway and a truck pulled in front of me I had to put my foot on the break. And then I put my foot on the gas and turned left then right into the driveway and it died. Ithe dashboard said put in park when I put it in park it said engine power low. The first time I took it in to Toyota I was sitting there for six hours and they could find nothing wrong. They told me they were working with corporate and no one had an answer for me. After the third time I called corporate and was dealing with a woman who was very professional and try to be helpful and told me to take a back to the dealership. I took a back left it for two days and they could find nothing wrong. The outcome was that if it happens again I should have it towed back to the Toyota dealer and not turn it on. I am very concerned I am worried about driving and having someone crash in to me if my car stops in the middle of traffic. I had a Toyota before and it was fine but I have to tell you if I get through this one which is a lease I will never buy another one again

- Buffalo Grove, IL, USA

The contact stated was employed by hertz rental cars. The contact stated that a 2020 Toyota Corolla caught on fire. Fire noticed 3-4 hours after vehicle was parked and driving out a parking lot. The fire department was contacted and extinghised the vehicle. A fire deprtment report was taken with file #111520199429275. The contact stated that after the vehicle renter was driving the vehicle out of a parking lot after being parked for 3-4 hours, flames were noticed coming from the front driver's side of the vehicle. The vehicle renter exited the vehicle and noticed flames coing from under the front driver's side. The fire department was contacted and extinguished the fires. A fire department report was filed. The contact stated that the vehicle was deemed a total loss. The contact was unaware if the cause of the failrue was diagnosed by a dealer. The manufacturer was not made aware of the failure. The failure mileage was 8,190.

- Scranton, PA, USA

On more than one occasion I was going between 5-10 miles an hour and the car sputtered and felt like it was going to shut off. I told the dealership when I took the car in for regular service and the told me the computer did not find anything wrong and they could not replicate the problem when driving it. Also when accelerating the car will make a clunking sound. Again the dealership denied a problem. These issues have happened multiple times

- Wesley Chapel, FL, USA

Will driving the car decelerated and would not go pass 20mph. Break, engine, ect. Lights turned on. The car has only 1345 miles. So far it has happened twice. Second time going to the dealership.

- Santan Valley, AZ, USA

Engine abnormal shift downward while driving regularly. I feel the shift is not smooth even feels like a defect in the engine shift system 17,000 miles mostly happens regularly driving on city streets and a bit less happens on the parkway but does happen. The shifts are hard to ignore I remember the very time I felt it on 10,000 miles and it would able occasionally and now it's happening even more frequently than I can possibly say this is an ongoing defect and growing to be a problem even more so.

- Rio Grande, NJ, USA