2020 Hyundai Tucson: check engine light

Filed Oct 15, 2026 · Driver assistance · 44,000 miles · OH

The contact owns a 2020 Hyundai Tucson. The contact stated that upon starting the vehicle, the check engine, master general, and forward collision warning lights were illuminated. The vehicle was taken to the dealer, where it was diagnosed, and the contact was advised that the multifunction camera had failed and needed to be replaced. The manufacturer was notified of the failure. The failure mileage was 44,000.

Filed Sep 18, 2026 · Engine, Fuel system · NJ

Engine has defect that causes oil to heat at an unusual levels there for damaging other vehicle components such as The exhaust system parts clogging up and Triggering check engine warning lights for emissions.

Filed Jul 28, 2026 · Engine · UT

The engine lost power while driving, and the vehicle entered a reduced-power mode. The check engine light began flashing, and the engine made a loud knocking noise during acceleration. A diagnostic scan showed code P1326 (Knock Sensor Signal Range/Performance). The knock sensor was replaced, and the engine oil was refilled after discovering an oil leak. The vehicle operated normally for a short time, but the same symptoms returned. The vehicle is available for inspection. The vehicle suddenly lost power while traveling approximately 70 mph on the highway, making it difficult to maintain speed and safely keep up with traffic. This created a risk of being struck by other vehicles or causing an accident. The problem has since recurred during normal driving. The problem has been reproduced multiple times. A diagnostic scanner consistently identified code P1326. The knock sensor was replaced and the engine oil was replenished, but the same symptoms returned after several trips. The vehicle has not yet been inspected by a Hyundai dealership. The vehicle has been inspected by the owner and a family mechanic who replaced the knock sensor and identified an engine oil leak. It has not yet been inspected by Hyundai, law enforcement, or an insurance representative. There were no warning lights or messages indicating low engine oil or an oil leak before the failure occurred. I had the engine oil changed approximately one month before the incident. While driving on the highway at approximately 70 mph, the vehicle suddenly lost power, the check engine light began flashing, and the engine started making a loud knocking noise. After inspecting the vehicle, we discovered it had an engine oil leak and the oil level was low. Before the loss of power, there were no warning signs that the engine was losing oil or that there was an oil leak.

Filed Jul 18, 2026 · Engine · NY

Tried passing someone on the thruway, as I was about to the car jerked a bit then started decelerating. The check engine light started flashing and so did the oil light. Read the code as cylinder 3 misfire and a knock sensor. Changed the spark plugs and coil packs then checked the oil and saw there was no oil in the engine. Was told by my mechanic it’s a common problem with these Hyundai engines, it seems the rings are getting fried in the engine and that’s why it consumes oil so quickly.

Filed Jul 14, 2026 · Engine · NC

While driving on the highway with adaptive cruise control on, car began decelerating without any vehicle in front. Started to get off highway, check engine light began flashing and came to a full stop. Car died. Tried restarting and car died. Check engine, oil and battery lights then on. Total engine failure and no warning lights prior.

Filed Jun 29, 2026 · Engine · MN

Vehicle is a 2020 Hyundai Tucson with a 2.4 liter engine: Theta II GDI. Vehicle was purchased new and maintained properly. Excessive oil consumption began at about 50,000 miles. Vehicle was purchased in early 2020 and therefore has an engine manufactured in 2019. Tucson vehicles with this engine from 2011 through 2019 were recalled for engine problems including excessive oil consumption and rod bearing failure possibly resulting in engine fires. If engines were not replaced an extended warranty was given for 150,000 miles or 15 years. Hyundai will not remedy our excess oil consumption problem locally or nationally. An oil consumption test was done at the Hyundai dealer. Conclusion: by dealer and national level office: it's not bad enough to remedy. There were no engine warning lights activated because we check the oil regularly and add as needed. This post-2019 2.4 liter engine continues to be a hazard as some owners from previous year's models had engine seizures in traffic which is dangerous. Some owners reported engine fires. We have not experienced those tragedies but possibly post-2019 Tucson owners should be alerted to potential dangers.

Filed Jun 1, 2026 · Engine, Transmission · PA

While driving, the engine began making a loud knocking/rattling noise and the check engine light began flashing. The vehicle experienced a loss of power and was unsafe to continue operating normally. The vehicle was taken to a Hyundai dealership for diagnosis. The engine requires replacement. Hyundai denied coverage, claiming excessive oil consumption and/or maintenance concerns. However, upon inspection, the dealership removed the valve cover and advised that the engine was internally clean and showed no significant sludge buildup consistent with severe neglect. I am concerned that this engine failure may be related to known Hyundai engine issues involving the 2.4L GDI engine. The failure occurred well before the expected service life of the engine and created a potential safety hazard due to the loss of power while driving. I am requesting that the federal safety agency review this failure and determine whether similar failures are occurring in 2020 Hyundai Tucson vehicles equipped with the 2.4L GDI engine.

Filed May 22, 2026 · Engine · NY

I have had the car in twice to the mechanic within the last 6 months for check engine light. He said I keep loosing oil, but there is no leak and it's something with the Engine. Hyundai will not recall the engine, but I see so many people are having the same issue. On a 2020 vehicle, you should not have engine issues. At what point do they have a recall on this issue, as so many are reporting the same thing.

Filed Jan 13, 2026 · Brakes, Driver assistance · IN

I have experienced 4 repeated issues within 4 months with my vehicle. Starting in September 2025 and the 4th and current issue today 1/12/26. Driving when all of a sudden all of my brake components lamps come on dash oard, forward collision alert, and check engine, my vehicle struggles to accelerate accurately. Blue Link diagnostic throws various codes such as ECM, Transmission Control System, even "multiple possible issues". Each time my vehicle has been at Hyundai dealership for repair. Each time they repair something different 1st- replace ABS module and hydraulic brake, 2nd - happened out of state at my mother funeral and replaced my ECM, 3rd couldn't figure it out and guessed it was my Forward collision camera and replaced it, 4th - is today and awaiting dealership diagnosis. This issue has left me stranded several times local and long distance, occured in middle of driving including on highway, and overall uncertain of the safety and reliability of the vehicle as each time it has been the same type of issue. I have been in communication with Hyundai Corporate since October and they stated that even tho I only have 24k miles on the vehicle that it is outside the state of IN lemon laws for a buyback. If I hadn't purchased an extended warranty I would be in even more debt or unable to put it in the shop even tho I don't feel like this should be my burden when I have kept this vehicle in great shape, low mileage, frequent oil changes, etc . however the safety of my vehicles goes unresolved. At this point I am uncertain that Hyundai is properly diagnosing my vehicle and not certain how these issues are impacting other components of my vehicle such as brakes, transmission, engine, sensors. I am the only owner of this vehicle bought brand new. I have checked repeatedly for any recalls that I have not addressed and at this time none are pending. I fear that this vehicle will continue to have more safety issues.

Filed Jan 7, 2026 · Engine · OK

The contact owns a 2020 Hyundai Tucson. The contact stated that the engine was consuming an excessive amount of engine oil. The vehicle was taken to the dealer, and the oil level was topped off. The dealer requested that the contact return every 1,000 miles for inspection. The failure persisted, and the vehicle was returned to the dealer every 1,000 miles. The check engine warning light was illuminated. The vehicle was taken back to the dealer for an inspection, and the dealer discovered that the catalytic converter was defective and needed to be replaced. The vehicle was taken to an independent mechanic for a second opinion, and the contact was informed that the engine had failed due to a defect in one of the engine cylinders. The dealer was informed of the findings by the independent mechanic, and an appointment was scheduled to inspect the vehicle. The vehicle was not repaired. The failure mileage was unknown.

Filed Nov 18, 2025 · Engine · PA

the engine failed without warning. While going up a hill the car lost power. Yes, the dealership said it was a known problem. Yes, the dealership fixed the problem by putting in a new engine which I was responsible for 5% of the cost which was 739.66. The only warning that was given was after the car failed, the engine light and the oil light went on.

Filed Sep 13, 2025 · CA

When driving my check engine light started to blink and my car would not accelerate. I made it home and plugged in a diagnostic reader and got the code P1326 glow relay short circuit. My car along with my friends 2021 Hyundai Tucson both have this same issue. There needs to be a recall for these years. There is a recall out for this specific problem in sonatas and Tucsons and need to cover these years as well.