Toyota Corolla Engine problems
243 of the 1,128 complaints about the Toyota Corolla (21.5%) concern Engine, making it the model's largest problem area. That share is 1.0× the Engine share across all tracked vehicles.
Analysis
By model year, Engine complaints peak with the 2020 model (109, 36% of that year's complaints) and are lowest for the 2025 model (4). 31 Engine complaints were filed in the last 12 months versus 74 in the 12 months before — the pace is falling.
Owners most often describe: “bypass”, “valve”, “coolant”, “engine maintenance” and “maintenance required”. 8 of these reports (3.3%) describe a crash or fire, with 5 injuries and 0 deaths mentioned.
No recall campaign addresses Engine for the tracked model years.
By model year
When complaints were filed
Last 12 months: 31 · Previous 12 months: 74
Common terms in reports
- bypass133
- valve144
- coolant146
- engine maintenance84
- maintenance required76
- message54
What owners report
Drove car at reasonable low speeds (30-40mph) parked vehicle and noticed smell of something burning and light smoke. Opened hood and car was on fire. No mods, completely stock, low mileage. All services up to date. No reasonable explanation for sudden fire
To start, on [XXX], I was going through an intersection on a country road and my automatic emergency braking engaged for no reason. My car stopped despite no other vehicle or object being in my way or anywhere close to me.
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.
This Toyota Corolla hatchback is experiencing an issue where it is constantly giving an “ENGINE MAINTENANCE REQUIRED” light and when scanned, it says “coolant bypass valve malfunction”.
Notification spontaneously received as Engine Maintenance Required; Visit Your Dealer. Service appointment immediately scheduled for Toyota of Plano for the following day.
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.
Excerpts from complaints filed with NHTSA, trimmed for length. The ODI number is NHTSA's record identifier.
Related recalls
No recall campaign addresses Engine for the tracked model years.
Problem areas · Toyota Corolla
- Engine243
- Transmission / powertrain150
- Airbags & seat belts141
- Interior & equipment120
- Electrical100
- Fuel system75
- Brakes74
- Body & structure67
- Steering42
Toyota Corolla problems, complaints & recalls by model year ›
Related reading
- Why modern engines burn oil, and what owner complaints revealThe design choices that make many recent engines consume oil, the warning signs owners describe, what counts as normal, and which tracked models draw the most engine complaints right now.
Frequently asked questions
How common are Engine problems on the Toyota Corolla?
243 of the 1,128 complaints about the Toyota Corolla (21.5%) concern Engine, making it the model's largest problem area. That share is 1.0× the Engine share across all tracked vehicles.
Which Toyota Corolla model years have the most Engine complaints?
By model year, Engine complaints peak with the 2020 model (109, 36% of that year's complaints) and are lowest for the 2025 model (4).
Is there a recall for Toyota Corolla Engine problems?
No recall campaign addresses Engine for the tracked model years.