2020 Toyota Corolla engine problems
108 owner complaints filed with NHTSA name the engine on the 2020 Toyota Corolla — 35% of all complaints for this model year.
What owners report
“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…”
filed Aug 6, 2026
“A message came on the screen saying “engine maintenance required” and it’s not going away. Upon doing a google search, there is a common failure in the cooling system for these cars reported by a lot of owners.”
filed Jun 7, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is…
24TE04 · Warranty Program/Extension · issued Aug 11, 2026OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete.
T-SB-0104-21 Rev2 · Service Bulletin/Repair Instructions · issued Feb 27, 2026Owner Renotification Letter Due to certain programing in the engine ECU, under certain conditions, the vehicle may stall at low speeds when accelerating from a stop. If this low-speed vehicle stall occurs, steering and…
22TC07 · Other · issued Nov 17, 2025Owner Renotification Letter Due to certain programing in the engine ECU, under certain conditions, the vehicle may stall at low speeds when accelerating from a stop. If this low-speed vehicle stall occurs, steering and…
22TC07 · Other · issued Nov 17, 2025OBSOLETE NOTICE August 19, 2025: This bulletin is now obsolete. Please see T-SB-0059-25.
T-SB-0088-23 Rev2 · Service Bulletin/Repair Instructions · issued Aug 19, 2025
Engine problems in other Corolla years
| Year | Reports | Share |
|---|---|---|
| 2025 Corolla | 2 | 6% |
| 2024 Corolla | 6 | 10% |
| 2023 Corolla | 13 | 18% |
| 2022 Corolla | 14 | 14% |
| 2021 Corolla | 40 | 22% |
| 2019 Corolla | 39 | 19% |
| 2018 Corolla | 15 | 11% |
| 2017 Corolla | 10 | 6% |
| 2016 Corolla | 13 | 6% |
| 2015 Corolla | 17 | 8% |
| 2014 Corolla | 18 | 7% |
| 2013 Corolla | 16 | 8% |
Other reported problem areas on the 2020 Toyota Corolla
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.