Engine And Engine Cooling Problems of Toyota Corolla - part 1

I have experienced a message saying 'engine maintenance required' and after experiencing the same instances as many people have online, it seems the engine coolant bypass valve is faulty and needs to be replaced. No code can be read using a code reader either.

See all problems of the 2020 Toyota Corolla 🔎.

While driving my 2019 Toyota Corolla hatchback xse, I lost almost all power to my accelerator and a check engine light appeared on my dash. I came to a stop and stalled the vehicle, once it stalled I turned the engine back on and shifted into reverse a felt and heard a loud clunk noise coming from right under my car and its not only shifting into reverse is the loud noise active but its also shifting into drive from reverse. I scanned my vehicle with a aftermarket scan tool and got 2 exact same codes for "torque converter clutch pressure control solenoid control circuit performance/stuck off" and then two more codes for "torque converter clutch pressure control solenoid control actuator stuck on". My torque converter in my ctv transmission failed. I was not at a risk of putting other people or myself in danger but if would have if I was moving faster at the time this happened. I have done my research on the recalls that are active on this vehicle and on the Toyota oem tis website there is only 1 recall that was taken care of in 2021 for the fuel pump and then there is a warranty enhancement program for the flow shut-off valve coolant leak. I did not find anything on that Toyota tis website about the cvt recall but when I search my year, make and model on the web, I see that there is a recall for about 3,400 vehicles in the USA and nearly 1,000 in canada that have a active recall for the ctv. I also saw the recall consequence and it matches up with what happened with my Corolla. I have attempted to contact 5 difference Toyota dealerships in my state to have them help me figure out the issue I am having with my vehicle not being listed in the recall but my ctv just failed. No one has reached back out in the past two days and I am continuing to call almost 3 times a day. I would like some clarity on how I should go about handling this issue.

See all problems of the 2019 Toyota Corolla 🔎.

I have a 2019 Toyota Corolla hatchback. The problems started on July 21st, 2025. While driving my 2019 Toyota Corolla hatchback, I noted white exhaust smoke, even after the engine was warm. One week prior, I had filled the coolant reservoir, but when I checked it, the coolant was almost gone again. There were no visible leaks or puddles under the car. I refilled the coolant, but within days the car began shaking severely upon startup and emitted a coolant-burning smell. 5 minutes after, multiple warning lights illuminated on the dashboard simultaneously. I replaced the car battery, and the warnings disappeared. However, while merging onto the freeway, the same warning lights came back, the car lost power, and I could not accelerate above ~25 mph. If this occurred in heavy traffic, it could lead to a serious collision. I exited the freeway and had the car towed. Dtcs from the independent mechanic and the Toyota dealer included: p11ed00 p030085 p030027 p030200 (cylinder 2 misfire) c142571 (stop light relay actuator stuck) u1117 b2284 b15ad the Toyota dealer identified a “port injector #2 malfunction” and recommended replacing all four injectors (~$2,000) but could not confirm this would fix it. They noted a coolant-burning smell but advised addressing the misfire first before further diagnosis. There is an active class action lawsuit alleging that 2019–2023 Toyota Corolla and rav4 models have defective coolant bypass valves that may cause engine issues, overheating, or coolant loss without visible leaks. This matches the coolant loss, white exhaust smoke, and eventual power loss while driving. I request that NHTSA investigate this issue in connection to the reported coolant bypass valve defects affecting 2019–2023 Toyota Corolla models.

I was driving yesterday morning to work in freeway and a message appeared in the dash saying engine maintenance required. The message stills appears and it’s a safety issue that needs to be addressed by Toyota for defective parts or defective car and Toyota needs to replace my current vehicle for a new car. Furthermore this is a safety issue for me and others while the car is running.

See all problems of the 2021 Toyota Corolla 🔎.

Coolant bypass valve.

Engine maintenace required light came on. I was told that my coolant bypass valve needed to be replaced. This is happening on all Toyota vehicles from 2018-2024 common issue but the repair to fix something that should be covered under warranty.

Coolant bypass valve broken.

The contact owns a 2011 Toyota Corolla. The contact stated that while driving at an undisclosed speed, the contact heard a loud knocking sound coming from the engine compartment. There was no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed and determined that the oil pressure sending unit had failed and needed to be replaced. The vehicle was repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 150,000.

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Engine maintenance required p268115 engine coolant bypass valve.

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 car shows the message “engine maintenance required” that leads to the coolant bypass hose being bad.

The engine maintenance required sign popped up on my 2021 Toyota Corolla and took it to a dealer to get it diagnosed and they reported back it was the coolant bypass valve. They want 1,000$ to fix the issue even tho the person I was dealing with at the dealer shop said it’s happening to all the Corollas from 30,000 miles to 50,000 miles .

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.

Coolant bypass valve has failed. Autonation Toyota in cerritos has verified issue. This issue has caused potential engine overheating, engine maintenance required warning light has popped up in my vehicle, was told by autonation that my vehicle is not covered for this repair and I will have to pay out of pocket.

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.

Vehicle: 2021 Toyota Corolla apex, 2. 0l engine component failure: the engine coolant bypass valve (also called water valve) malfunctioned. Its plastic housing cracked and leaked coolant, corroding the electrical connector. This prevents proper electronic control of engine temperature. The failed component is available for inspection if removed. Safety risk: this issue poses a safety risk due to potential engine overheating. Overheating can lead to sudden loss of power or engine stall while driving, increasing the risk of a collision, especially at high speeds. A roadside breakdown in unsafe conditions is also a risk. Confirmation: a Toyota dealership service center confirmed the problem, diagnosing it as a leaking coolant bypass valve requiring replacement. Inspection: the vehicle was inspected by a Toyota dealership technician. It has not been inspected by the manufacturer, police, or insurance representatives. Warnings/symptoms: the primary symptom was the "engine maintenance required" message illuminating in the instrument cluster. This first appeared approximately [state how long ago, e. G. , "3 weeks ago" or "at 45,000 miles"]. No other immediate symptoms like visible leaks or temperature fluctuations were initially noticed, though a leak was confirmed later.

I got an “engine maintenance requested” notification on my car. I took it to a mechanic and they said the coolant bypass valve is defected.

Engine coolant bypass valve issues/faulty. No problems prior to “engine maintenance message”. Message only comes up when the a/c is turned on.

My 2021 Corolla showed an engine maintenance required message. This message pertains to replacing the engine coolant bypass valve - a common occurrence for the 2019-2023 Corolla/rav4 models. I have seen multiple instances online of complaints of this same issue around the 50k-60k mark of the vehicle. This should be a recall due to how common the problem is. I’m here to add on to that tally of complaints that have already been submitted.

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 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.

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 NHTSA 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.

On my 2021 Toyota Corolla se at 43k miles the “service engine needed” notification came on. As I’m researching it’s a known issue with these models and rav4 models. The cooling valve is needing to be replaced and Toyota does not cover it costing us about $500-$700 at the dealership.

Coolant bypass valve broken dealers are charging $800, class action lawsuit pending.

Manual driving shaft slips out of 6th gear while driving affecting the driving speed and increasing rpms.

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.

Upon startup in cold weather conditions, a brief but loud grinding/rattling sound will occur. The noise is related to an inadequate spring inside of the intake camshaft gear which will not push a small cylinder in place to lock the intake camshaft gear in place. When not in its proper place, the gear will rattle in its housing, causing the brief noise. If the gear rattles against its housing too hard overtime, it can break and cause catastrophic engine failure by sending metal pieces into the engine, including pistons and rods.

See all problems of the 2024 Toyota Corolla 🔎.

Coolant bypass valve replacement and bleed cooling system.

See all problems of the 2022 Toyota Corolla 🔎.

Replaced coolant bypass valve and bleed cooling system.