Coolant Bypass Valve
2020 Toyota Corolla engine complaints
Page 2 of 5: complaints 11 to 40 of 112, newest first, as owners wrote them.
On June 19, 2025, I was driving and out of nowhere, there was a warning notification that said "A warning light was turned on. Would you like to call an operator?" On the digital cluster, there was a message that said "Engine Maintenance Required - Visit Your Dealer. Mileage noted down was 79,632. I asked around for some insight and people are telling me it's the water/coolant bypass valve that's leaking and the Op code is 24TE04R1. Will this be a covered service?
The engine maintenance required message appeared on the dash. I was travel from work to home (about 40 miles). I pulled over immediately at a store, left my car and walked over a mile to the mechanic shop down the road (in 95° weather with a knee that has been through 3 surgeries in less than 5 years). The gentleman took me back to my car. Followed me as i took my car back to the repair shop since it was close and did not have any lights on the dash and I was not overheating. He plugged a reader in it and the error was a coolant bypass valve issue (i can't remember the exact verbage). I purchased a replacement valve 6-17-25, along with toyota coolant. I am having to wait and save up the money to have the valve replaced at the shop got the message code from. I can not afford the dealerships cost to replace the valve. The valve and coolant was expensive in itself. I have read many forums and blogs. Toyota knew there was an issue and I am requesting my reimbursement for the cost of replacing a part you knew was faulty.
Flow Shut-off Valve Coolant Leak
I have an error that appeared displaying “Engine Maintenance Required” after some investigation snd research, I have noticed that this is a common issue associated with the OEM Engine Coolant Bypass Valve. This occurred as I was driving home from work when I was driving down the freeway, I did not run into any obstacles or have an accident, it appeared out of thin air.
unknown. i know that my car was doing fine and then randomly the coolant was low and my car was overheating on my way to work. i have yet to get it fixed, as i dont know how much it could cost me. but i read that 2020-2021 toyota makes were having issues with their coolant.
An engine maintenance required warning popped up. The pop up wasn't going away. My engine sounds louder than usual when turning my A/C on.
I received a "voluntary Customer Support Program" letter from Toyota saying that a small engine coolant leak can occur that "can allow coolant to drip on other parts of the vehicle. This can cause 'Engine Maintenance Required' to be displayed or cause the A/C not to function normally." Then it concludes that repair with a new "flow shut-off valve" will fix the problem, "under the terms of this Customer Support Program." I thought this was a recall and took my car in only to find that they wanted nearly $700 for the repair, because I did not have an extended warranty. When asked whether this could cause a safety problem if unfixed the reply from the Service Advisor was yes -- the coolant leak could potentially cause the engine to seize up on the highway. I was shocked that a defective part in the car I purchased new for $20,000 plus would not be replaced free of charge. I have put less than 16,000 miles on the car and now I find the resale value is essentially zero. And I now may be driving a potentially risky vehicle that could crash or leave me stranded somewhere. I feel there should be a repair at no charge.
Car is currently at 56k miles and the "Engine maintenance required" popped up on my dashboard I'm pretty sure this is the engine coolant bypass valve which I read is a constant problem for new toyotas like mine
Drive start control malfunction occurred when turning the car on. Second time this has happened. First time was a charcoal canister and engine coolant valve. It was replaced under warranty at 50k miles but now at 96k miles the dealer says it is not covered under the extended warranty. Not sure how this problem happened.
Once I parked my car and turned on the A/C a couple mins later I received a warning message on my car screen saying “ Engine Maintenance Required Visit Your Dealer”. After having my car for 4 years I’ve never received this message till now (04/22/25). I thought it was because I needed an oil change but I was wrong because my oil is good. I checked my car and saw that the issue is the “coolant bypass valve”. I don’t even use my car that much for this to happen. I saw this is a common issue with a Toyota Corolla 2020 but the dealership does not want to fix this issue for free.
I own a 2020 Toyota Corolla, and without any prior warning, the “Engine Maintenance Required” message appeared on my dashboard at approximately 79,575 miles. There were no unusual symptoms—no overheating, strange noises, or performance issues—before the light turned on. I had my vehicle inspected by Golling Toyota of Warren, where they diagnosed the issue as a faulty Engine Coolant Bypass Valve. I was informed that the valve needed to be replaced and flushed. The total cost of the repair was $932.21, which I had to pay out of pocket. Because the message specifically said “Engine Maintenance Required,” I was concerned that it could be a serious engine issue. Out of caution, I avoided driving the vehicle until it was inspected, as I didn’t know whether it could result in engine damage, performance failure, or a sudden breakdown while on the road. The fear of an unknown engine-related malfunction created a genuine safety concern for me and others —especially since the warning came without any prior symptoms. I later learned that the problem was tied to the Engine Coolant Bypass Valve, which is known to fail prematurely in Toyota vehicles. This failure can affect engine performance and temperature regulation, increasing the risk of engine damage or failure while driving. There is already a class-action lawsuit concerning this issue, yet Toyota has not issued a recall. Owners like myself are being left to pay out of pocket for a known defect that poses real safety risks. I’m submitting this complaint in hopes that Toyota will be held accountable and that the federal safety agency will take appropriate action to protect consumers from this recurring and potentially dangerous defect.
“Engine maintenance required” alert received, related to a faulty coolant bypass valve which will need replacement. Vehicle is currently at 51,049 miles. Alert message can’t be dismissed from the dashboard. It obstructs a significant portion of the speedometer.
Coolant bypass valve broken dealers are charging $800, class action lawsuit pending
Engine Maintenance Required displays see dealer displays in Panel. I have taken to my local shop Engine coolant bypass valve replaced. Still having same issue.
Valve matic is messed up. According to my research this is a known issue with 2020 Toyota corollas.
Vehicle maintenance light won’t turn off, stays off if car started with AC off but comes on and stays on while AC is running. Coolant overflow valve malfunction
"Engine maintenance required. Visit dealer" message appeared about 2 years ago. The message appears when I turn on the A/C or heater and will not go away, which affects multiple functions such as speedometer and text function.
Engine coolant leak from an issue with a valve that allows coolant to drip on other parts of the vehicle. “Engine Maintenance Required” is displayed on the instrument cluster and causes the A/C to not function normally.
I keep getting a warning sign on my dashboard stating that "Engine maintenance required. Call your dealership". After scanning for codes, I get the code P2681, or that the Engine coolant bypass valve is faulty. After looking online it appears that this is a common issue with this car model. There is a class action lawsuit for this right now since the part is known to be faulty and can crack and leak engine coolant. Toyota has refused to issue a recall for this and will charge you to replace this faulty hardware. I also am not able to clear the message while driving and it will constantly pop back up distracting me while driving and making me unable to see any important warning on my dashboard. This is endangering my ability to safely drive my vehicle.
There was a maintenance required notice on my dashboard and I searched up that it was my coolant bypass valve having an issue. Apparently it’s a defective part in Toyota Corolla and rav4 models from 2019-2023 I believe. The notice would come on and off each time I would start the vehicle. The dealership has confirmed this issue is common and after having it inspected and diagnosed, it was indeed the coolant bypass valve. My safety and the safety of others were fine, my engine would’ve been the unfortunate casualty if I did not take care of this.
Car would not start/turn over - Not battery related. Toyota determined the ECU went bad and stated the cause was improperly jumping the battery. The issue happened randomly one day (car was driving fine previous days)
There is a problem with the bypass control heater valve of my car Corolla Toyota 2020 It says i have to replace it but it's still running good. I research what this part is about and it says that this is a malfunction in all the Toyota Corollas and RAV4 2019-2021. The message "engine maintenance required" doesn't go away and it doesn't let me see the mile percentage when driving. This problem has been confirmed by a mechanic who installed the tablet and run a test to see what's wrong with it. The car has not been checked by insurance because of this manufacturer malfunction. This all started happening 6 months ago and haven't found a way to replace it and dealership charges over 800 dollars for a mistake Toyota made on all Corollas line. Please help me find a solution. Thank you!
Vehicle was brought to Toyota because of "Engine Maintenance Required" message. We initially thought it was "Maintenance Required" so husband said we may need to change the oil, but it was only a few thousand miles since last oil change. I tried to remove the message but the Toyota Manual did not have any instructions on the "Engine Maintenance Required" message removal. When he left Toyota after changing oil, same message was on dashboard. Husband went back to Toyota and asked them to remove the "Engine Maintenance Required" and was told that there is a coolant bypass valve that must be changed in order for the message to go away. The cost should be around $1,000 and then proceeded to tell him he needed to buy new tires as well. All would total about $2,800. Vehicle has 58K miles and we are afraid to drive the vehicle now until we know what is actually wrong with it. It's suspicious to read all the complaints describing the same situation we have with Toyota. By the way, after we were told about the needed repair, I started getting emails from Toyota about purchasing a Toyota warranty, advertisements in the mail from car warranty companies and phone calls from Toyota salespeople to come and buy/lease a new Corolla and I would get a "great deal"! Is this some scam to generate business? Are Toyota owners being subjected to a "bait and switch" scam? I would like an investigation initiated by your agency. My vehicle is available upon request and our safety is at risk because we truly don't know what is wrong with it and afraid to drive it any longer. If your agency wants to read complaints from other owners, I direct you to read the complaints on [XXX] or Google "Toyota Engine Maintenance Repair" message. It's very much an eye-opener about fraud being perpetrated by Toyota. I can provide any documentation needed when I am personally contacted and requested to furnish them. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
My 2020 toyota corolla's warning light which stated "engine maintenance required visit your dealer" came on. When I called the dealership they stated I would need to come in and hook it up to diagnose the problem which would cose me $185 + taxes and fees. Then once diagnosed they would be able to fix the problem. I checked with O'Reilly's autopart store and Autozone which both of their scanners found nothing wrong. So I informed Toyota and they stated they I need to bring it to them because their scanner/tool is the one which will tell us what the problem is specific to my car. But they stated they think it could be a hose related to my coolant system to prevent my car from overheating. They stated to watch the temperature gauge while driving as it may overheat and become dangerous to drive. If this happens or I see any smoke pull over and get out if the car. However they haven't seen anyone have to do this so they think I should be fine but I should fix this problem soon. I asked if that is the problem would it fall under my mechanical breakdown insurance coverage and the dealership stated that if that's the problem yes but if I go through the insurance it will take a really long time to fix because they'd have to file a claim and get paid before doing any repairs. Then they said I'd have to pay the copay and any difference. I was confused as my insurance states I only have to pay my copay. However, I had someone else with a scanner/tool hook theirs up and to see if we could check the actual problem and it did say the error code P268115 engine bypass coolant valve. So, this was the issue. I viewed online that there is a class action lawsuit going on right now for this same problem with 2019-2023 Toyota Rav 4 and Corolla's. Toyota failed to disclose this information to it's consumers and it is not being covered under the power train warranty either. This safety issue with cars overheating is dangerous and costly.
Coolant/oil bypass valve. Warning issued Sept 24th. I understand 6000 complaints have been filed with this vehicle model under 30,000 miles
Getting engine maintenance required, coolant valve failed for no reason.
The engine Coolant Valve is leaking coolant, in ordering a new part to replace so yes it’ll be available for inspection. My car Could overheat leaving me or my riders stranded wherever it is that the car stops. I went to Tires plus and they said I had to swap it out but I refuse to go to Toyota so they can rob my money The part has not been inspected by manufacturer, police, or insurance, The only symptom is my coolant runs low sometimes and my engine maintenance screen won’t go away
I have been a victim of a known defect in Toyotas Coolant Bypass Valve as of recent when approaching my 40000 mile service maintenance.
Got an engine maintenance required light show up, took my car to the dealer to diagnose, they stated that i need to replace my coolant bypass valve
VIN decoder
See the problems and recalls for an exact car
Buying a used 2020 Toyota Corolla?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history