Had my car (Toyota Corolla 2020 SE) give a -??engine maintenance required, take to a dealer-?? error message on my digital dashboard. No error codes from any maintenance device but apparently only the Toyota dealership can find this in the software using their computers to find it somewhere deep in there-?? The problem is the upper engine coolant bypass valve. This is costing me almost $1000 including the $80+ in diagnostics that ONLY the Toyota dealership can see and find out. Apparently this is a very common occurrence with the 4 cylinder corollas and RAV4s.

- Panama City, FL, USA

Engine Coolant Bypass Valve replacement, Toyota is charging me 888 dollars for repair.

- Pacoima, CA, USA

I discovered that my 2020 Toyota Corolla SE has a Coolant Valve Bypass malfunction coded "p2688115". I have also discovered this a prevalent issue after you hit 70,000 miles. There are forums all over the internet with complaints about the same issue as mine. I did some research and found no recalls. With this being such a common issue for no reason, faulty equipment. The car has been inspected by a Toyota dealer in Bradenton, FL because we had thought the service vehicle message was for a tire rotation. They scanned the vehicle and discovered the fault code "p2688115" after trying to reset it numerous times. The senior tech was the one who scanned it. He knew the exact reason why it was not clearing before scanning the vehicle. He only scanned it to solidify his hypothesis. I then spoke to the service team, they wanted me to bring it in for a diagnosis that would cost $85 if my warranty did not cover it. The cost of the part was estimated at around $150 plus labor and taxes. It was over a $400 repair. For a repair as such, this needs to be recalled. The warning message never went away, if you tried to clear it to view the screen you had about three seconds before it came back on. It is a major safety risk for those who wear glasses and drive at night. I use the screen to keep myself safe and maintain my driving speed. This warning message came on around 70,000. Some so many other individuals have experienced and complained about the same problem. This needs to be escalated. I am not allowed to utilize the safety features my car has to offer. Please take action and commence an investigation.

- Bradenton, FL, USA

After bringing my vehicle in for its oil change and tire rotation, a warning message showed up from my car saying "Engine Maintenance Required". After checking with my dealer, they said that the coolant bypass valve needed to be replaced. My car only has 33,000 miles and has had no issues whatsoever.

- Doral, FL, USA

After I had brought a my car to the dealer for its oil change and tire rotation, a warning message came from my car saying "Engine Maintenance Required". After checking with my dealer, they said that the coolant bypass valve needed to be replaced. After checking online, it seems that this is a common problem for recent Toyota vehicles.

- Doral, FL, USA

Coolant bypass valve leaks through wiring and damages itself.

- Zephyrhills, FL, USA

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