2020 Toyota Corolla: check engine light

Filed Aug 6, 2026 · Engine · CA

Part is the coolant bypass valve. Toyota has been taken to court but dealership claims now that I’m over 100k miles I can’t do it. There was also a second part about 10 years but I wasn’t clear on the details of the outcome. Toyota has acknowledged this issue in court but failed to do so at the customer level in my case. engine light came on at 97k and now I’m at 104k which is over that 100k mark. Issue is I’ve only take my car to Toyota for repairs. They have known about this but failed to repair or notify me of it. I would have immediately brought my car in at 97k if. I had known. This puts not only me but my 3 kids and entire family at risk every time i drive. This is known to the dealership and they been taken to court for failures to notify customers of this known defect. It’s been inspected by Toyota the last time I took it in about a week ago at 104k miles.

Filed Apr 24, 2026 · Engine, Fuel system · 59,000 miles · PA

The contact owns a 2020 Toyota Corolla. The contact stated that while at a red light, the vehicle shut off with the check engine and several other unknown warning lights illuminated. The vehicle restarted after several attempts. The vehicle was taken to an independent mechanic and the failure was duplicated. The mechanic retrieved DTC: P1603; "Engine Stall History" (ECM recording an unexpected engine shutdown or a communication error with the Transmission Control Module (TCM). The mechanic associated the failure with the federal safety agency Campaign Number: 20V682000 (Fuel System, Gasoline) and referred the contact to the dealer for assistance. Several dealers were contacted, and the contact was informed that the VIN was not included in the recall. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 59,000.

Filed Nov 22, 2025 · Brakes, Electrical · TX

Beginning on April 18, 2025, my 2020 Toyota Corolla LE began experiencing repeated failures involving multiple safety systems while driving. Without warning, several lights illuminate at the same time, including: Brake System Malfunction, Pre-Collision System, Parking Brake System, Vehicle Stability Control, Check Engine, and Secondary Collision Brake System. These warnings appear suddenly during normal driving, then sometimes disappear, then return again unpredictably. These failures disable several integrated safety systems and create a serious safety risk due to changes in braking performance, loss of stability control, and disabled collision-avoidance functions. Diagnostic scans from both the dealership and an independent mechanic repeatedly show: P1578 — Brake System Malfunction P265B — Rocker Arm Actuator Position Sensor Circuit Range/Performance (Bank 1) Both codes reappear even after being cleared. The vehicle was with Loving Toyota Lufkin, TX multiple times over seven months. They received over $7,100 in insurance payments for repairs, $463 towing cost (due to the negligence of Loving Toyota) and almost $1,500 in rental cars (Paid by State Farm) but were unable to diagnose or fix the underlying failure. Loving Toyota also provided a courtesy rental for 7+ weeks while they did no repairs to the car. The safety warnings continue to occur. Toyota Corporate is now involved but the vehicle remains unsafe to drive. The same code P265B is present that was present back in April 2025. This car is not safe! The problem has been reproduced by me, the dealership, and an independent shop. The vehicle is available for inspection. All scans, photos, videos, and documentation are available upon request. Date first occurred: April 18, 2025 Issue continues intermittently to present day

Filed Nov 19, 2025 · Electrical, Transmission · HI

This is in regards to toyota CSP 24TE04 and the Engine Bypass System. This was also included in a class action lawsuit that got dropped. Engine Bypass System is faulty and shows check engine requiring replacing of Bypass Valve and or wiring. According to 24TE04 it has been affecting over 2 million cars, but not all are being fairly covered. They need to include all models with this system that were produced during this time. Thank you

Filed Oct 9, 2025 · Transmission · CA

I was driving on the freeway on my way to the house my car start to make some noises and I was loosing power I pulled up on the shoulder and turn off the car because the check engine came on turn off the car again but was struggling to go into first gear

Filed Sep 2, 2025 · Transmission · 64,000 miles · LA

The contact owns a 2020 Toyota Corolla. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. The contact became aware of an abnormal clunking sound, and that the check engine warning light was illuminated. The contact stated the failure had occurred while driving on a busy road. The contact attempted to shift the gear shifter into different driving modes; however, the vehicle failed to accelerate as intended. The contact stated that several good Samaritans pushed the vehicle into a nearby driveway. The vehicle was taken to an independent mechanic where it was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 64,000.

Filed Oct 1, 2024 · TX

the check engine light came so i took it to toyota dealership. i paid 300$ to get a diagnostic and they said it was my coolant bypass valve and it was 900$ to fix. warranty doesn’t cover this even tho my car qualifies for the coverages. it’s super frustrating since i bought this car brand new and im having multiple expensive problems. i need to replace the transmission, BRAKE ACTUATOR, oil replacement pan and i had to replace a brand new battery because it exploded after only using for less than a year.

Filed May 15, 2024 · Engine · 119,000 miles · DC

The contact owns a 2020 Toyota Corolla. The contact stated while driving at undisclosed speeds, the check engine warning light was illuminated and flashing. The contact stated that the vehicle was not accelerating above 30 MPH. The vehicle was taken to an independent mechanic where it was diagnosed with a rocker arm actuator system performance failure and several other unknown failures. The vehicle was not repaired. The contact discovered the Technical Service Bulletin: 0098-19; however, it was not verified if the vehicle was included. The manufacturer was not made aware of the failure. The failure mileage was approximately 119,000.

Filed May 14, 2024 · FL

Check engine light is giving a false positive. There is something wrong with the coolant bypass valve. I checked online and this is not an isolated event.

Filed Oct 4, 2023 · Fuel system · VA

Driving approximately 20 mph- hear a beep- get instructions to go to neutral- check engine light / power steering lights are on- pulled off the side of the road- put in park, turned off and waited a minute and it started normally.

Filed Aug 27, 2022 · Driver assistance, Transmission · MO · crash · 3 injuries

I am not sure what the component is but I am driving and as I accelerate the gas my car will lose power to increase speed. If I am at the stop sign or stop light and I proceed to go the car will stall and not get going once I place my foot on the gas. I have reached out to the dealer by phone and when I have obtained service I am being advised that it's nothing. But I have experienced it on multiple occasions and even had an accident and nothing is being done to resolve the issue. I know that it can't be normal for the vehicle to do that and I am tired of getting the run around in regards to it. I was able to see that there has been a recall but do not see that it is in regard to me vin number. Can you please assist me with this matter. I should not be in the middle of driving or at a stop light and not able to accelerate my vehicle to a regular speed. I would like to have this matter looked into by a different Toyota dealer. Also it happens randomly and when I take to the dealership nothing is ever done and the issue is constantly being ignored. I am being told that due to no check engine light being on that my car is fine and its not. I don't want to lose my life due to the fact that I have purchased a faulty car and have not been made aware of any issues to protect my safety.

Filed Jul 3, 2022 · Transmission · MD

My vehicle has 20k miles on it and during acceleration, the CVT would not upshift was bouncing off the rev limiter. I had no controls over the Paddle Shifts or Electronic manual shifter controls. Tried to accelerate again, and bounced off the rev limiter again. Shortly after the CEL came on and the vehicle went into LIMP mode causing me to lose control of accelerator pedal, and the car drastically decelerated on its own until about 35mph Yes. Transmission is currently at shop awaiting for replacement unit This issue happened during a driver education event, and therefore was not on public roads with other pedestrians. Had this happened on a highway during merging or passing on a highway, this could have caused an accident by not having control of car's deceleration, and no warning brake lights to drivers behind me could have caused other drivers to rear end me Yes. The issue was reviewed by 2 dealers and both reported the CVT was faulty and needed replacement Yes. CEL came on, and was displaying codes P2757 and P2820. Dealer pulled the following codes: P275600- Torque converter clutch pressure control solenoid control circuit performance/stuck off P281F00- Pressure control solenoid j performance/stuck off (2 trip detected) P281F71- Pressure control solenoid j performance/stuck off actuator stuck