2021 Toyota Corolla

The Clutch Slave Cylinder needs replacement

Engine maintenance required, call dealer. The engine coolant bypass valve needs to be replaced. Known issue in Toyota corolla’s yet no recall to remedy the repair.

Coolant bypass valve has shorted out. “Engine maintenance required” notification popped up on the gauge cluster

Today I noticed that both of my door front locks passenger and driver side do not even actuate to have the door locked and unlocked by key of by the alarm. They completely stopped working. Even I contacted Toyota Corporate several times about this issue (800) 331-4331 and got ignored. This is a safety issue that needs to be addressed immediately. This is a safety concern for me and family.

One night shortly after starting the car, I went to put the car in first gear amd as I let out the clutch, but pedal stayed flat to the floor. I was able to lift the pedal with my foot and drive the car back to safety. The next day, I drove the car to the nearest shop before anything catastrophic happens. This time, right in the shop parking lot, I lost all hydraulic pressure in the clutch and I could not take the car out of gear. I had to turn off the car to prevent it from stalling as the clutch slowly engaged without my doing. I had the car inspected by two repair shops—one quote at $3900, the other at $6600. The issue is a failed seal on the clutch slave cylinder, located inside the transmission. The seal is much too thin from factory to withstand normal use. There are no recalls for this issue, and MANY affected owners. This is a safety issue because the failure can be almost immediate and will leave the driver unable to take the car out of gear, leading to out of control driving.

The contact owns a 2021 Toyota Corolla. The contact stated that while driving at 20 MPH, the clutch pedal failed to function as intended. The clutch pedal was stuck, and the contact was unable to shift gear. The contact forced the clutch back into neutral while holding the clutch pedal. Once the clutch pedal was released, the vehicle went into LIMP Mode and traveled down to the floorboard. The contact pulled over to the side of the road. The contact kicked the clutch pedal upwards to continue driving back to the residence. The contact arrived at the residence and inspected the vehicle, and became aware that there was brake fluid leaking from the vehicle, and the brake fluid reservoir was empty. The vehicle was towed to an independent mechanic who diagnosed that the clutch slave cylinder had failed and damaged the clutch and the flywheel. The vehicle remained with the independent mechanic unrepaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 65,000.

While in a parking lot, the clutch pedal suddenly lost all pressure and remained stuck to the floor, rendering the vehicle unable to shift gears. While this occurred at parked car , a sudden loss of gear engagement at highway speeds would have caused a catastrophic loss of motive power in high-speed traffic. Furthermore, this vehicle utilizes a shared reservoir for both clutch and brake fluid. A major failure of the clutch slave cylinder seals can lead to rapid fluid loss or air ingestion into the shared hydraulic system, potentially compromising braking performance. The dealership confirmed the internal clutch slave cylinder failed prematurely at only 38,000 miles. Because the part is internal to the housing, a full transmission removal was required, resulting in a total repair cost of $5,600. Despite the safety implications of a shared hydraulic failure and the extremely low mileage, Toyota has refused to cover the full cost. No warning lights or symptoms appeared prior to this sudden failure.

The contact owns a 2021 Toyota Corolla. The contact discovered brake fluid on the clutch pedal, and the brake pedal was mushy while depressed. The vehicle was taken to the dealer, who determined that the brake master cylinder needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 89,900.

“Engine Maintenance Required, See your dealer” light comes on the dashboard with a warning bell. Did a diagnostic test, and the code is the coolant bypass valve malfunction. This seems to be a common issue among 2020-2021 models. This has been inspected by professional mechanics.

At approximately 5 years and 2 months of ownership, with approximately 53,000 miles, the clutch slave cylinder failed in such a way that contaminated both the clutch and flywheel with brake fluid. Repair of this issue requires replacement of the slave cylinder, clutch, and flywheel, as described by Toyota of Pullman in Pullman, WA who performed the inspection and quoted the repair. The symptoms of this failure included an inability to shift the manual transmission between gears, most notably out of 1st gear to get to 2nd. This inability to change gears resulted in limited speed in traffic, and created an obstruction. In less fortunate traffic conditions, this speed restriction could have created a collision. Other owners of the same model vehicle online have reported active failures in traffic, some of which have resulted in damage to the transmission as well as the clutch and flywheel. Toyota appears to have redesigned the slave cylinder at least twice, implying that they know the parts for these vehicles are subpar, and there are no flywheels available for the repair, which also implies this may be an all too common repair.

NOTE: This has not happened to me yet, but it appears that most Corollas manufactured before 2022 or 2023 have this issue. However I did recently flush the fluid from my clutch system and it was very clearly contaminated, possibly indicating early evidence of a failure. Clutch system, specifically the slave cylinder is faulty on these vehicles. It is a known issue on these cars that the clutch slave cylinder (inside the transmission) is made out of resin and fails. When the slave cylinder fails, brake fluid from the shared clutch/brake reservoir leaks out onto the clutch and flywheel, damaging them and resulting in an expensive repair. In addition to this, the brake fluid leak results in a "low braking power" message on the dashboard, indicating a problem with the braking system. Obviously this is a safety issue that could cause an accident. This issue has been confirmed by many dealers and the solution is to replace the slave, clutch, and flywheel and flush & refill the brake fluid reservoir. The vehicle has not been inspected by the dealer as of yet, but in the interest of safety I am considering an early replacement of the cylinder. The only warnings of this issue are a clutch stuck to the floor, and in some cases a "low braking power" warning on the dashboard. A low brake fluid level may also be an indicator of this issue if caught in time. Incident report below is of the clutch flush, showing the contaminated brake fluid from the clutch hydraulic system. It's important to note that flushing the clutch is not a recommended maintenance item at any point on these vehicles as it is expected to be done with the braking system, although that won't remove contaminants from the clutch cylinder.

On December 12, 2025, I was in a head on car accident in my 2021 Toyota Corolla nightshade. I was slammed into the steering wheel which caused injury. My car has over $14,000 worth of damage to the front yet my airbags did not deploy. I have taken my car to Toyota several times over the past few years and every time I’ve asked about a remedy for this recall I’ve been told there is no remedy as early as June or July 2025 I had to bring my car in for a manufacturer defect with the engine that Toyota fixed for free. I asked them about the recall on the airbags. They again told me there was no remedy.

I am filing this complaint regarding a serious defect in my 2021 Toyota Corolla (Manual). At approximately 42,000 miles, the clutch slave cylinder failed. This defect caused hydraulic fluid to leak and contaminate the clutch assembly, resulting in significant damage and loss of proper function. Despite the fact that this issue stems from a defective part, the dealership has refused to cover the repair of the clutch assembly, stating that the clutch is not covered under warranty. Instead, they are requiring me to pay for the repair out-of-pocket, which would not have been necessary if the damage had not been caused by the defective clutch slave cylinder. I believe this is unfair and unsafe, as the failure of a clutch slave cylinder directly impacts the drivability and safety of the vehicle. This is a significant safety issue. A defective clutch slave cylinder can lead to sudden clutch failure, loss of vehicle control, and increased risk of accidents. This is not a wear-and-tear issue but a manufacturing defect that compromises the safety of the vehicle. I respectfully request that NHTSA investigate this matter to determine whether similar failures are occurring in other Toyota Corolla vehicles of this model year. If this is a widespread defect, I urge NHTSA to take appropriate action, including a recall or requiring Toyota to cover repairs.

The contact owns a 2021 Toyota Corolla. The contact stated that while driving in a parking lot, the clutch pedal failed to function as intended. The clutch pedal was depressed and failed to return after being released. The contact used his foot to raise the clutch pedal. No warning lights were illuminated. The vehicle was taken to the dealer, where it was diagnosed and determined that the slave cylinder had failed. The vehicle remained at the dealer unrepaired. Upon further investigation, the contact related the failure to the six-speed manual transmission. The manufacturer was notified of the failure and assisted with the labor cost. The failure mileage was approximately 58,000.

While attempting to change a flat tire on a 2021 Toyota Corolla Hatchback, two wheel studs sheared off completely, leaving the wheel unsafe to drive. My wife was stranded alone in the mountains with no cell service. She managed to loosen three lug nuts, but the final two were seized. When a passerby assisted, both seized studs snapped. The spare could barely be mounted. The vehicle has been serviced exclusively by Toyota dealers since new. Lancaster Toyota later replaced the broken studs free of charge, yet simultaneously claimed that another dealer, Frontier Toyota, had “switched the tyres.” so Lancaster are not responsible. That claim is false — Frontier’s invoice (Sept 25 2025) clearly shows only an oil change and inspection, no tire or wheel service of any kind. Replacing the studs at no charge while denying responsibility suggests an attempt to quietly resolve what may be a dealer-induced over-torque or defective-stud failure. The broken studs were not returned to us despite multiple requests — effectively withheld by the dealer, which constitutes unauthorized retention of customer property and prevents independent verification of failure cause. Toyota Corporate (case #251103002581) was notified but refused to investigate, referring the issue back to the same dealer. This complaint is being filed so NHTSA can document a potential wheel-stud safety defect or service-related failure and dealer mishandling of critical evidence that could conceal a wider safety problem.

Complete failure of the slave cylinder under at 62k miles. changed fluid at 30k. Called to see if Toyota would still help with failure under warranty but did not help. Had to replace slave cylinder due to seal bursting. Left stranded on road.

Dunlop SP Sport 5000 - 225/40R18 - DOT EUT74DDR5220 3 of the 4 tires are splitting on the side walls

My car wouldn’t start and the dashboard says “Engine Stopped / Power steering low” car will stop driving completely randomly. No codes are popping up when I test the car.

The contact owns a 2021 Toyota Corolla. The contact received notification of NHTSA Campaign Number: 23V865000 (Air Bags); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue and confirmed that parts were not yet available. The manufacturer was made aware of the issue and confirmed that parts were not yet available. The contact had not experienced a failure.

The problem of windshield wipers going off either once, or at varying speeds has not been able to be reproduced by my Toyota dealership. It goes off right when I turn the car on 50% of the time and is very inconsistent. Wipers typically go off after using the turn signal, making long turns (such as into a parking spot), and driving on long curved roadways. It has been inspected and nothing has been found. There are no warning lights or messages.