2020 Hyundai Tucson

I am reporting a serious safety issue involving diagnostic code P1326. My vehicle developed engine knocking and little to no acceleration and appeared to enter a reduced-power or limp-mode condition while driving. This made it difficult to merge, maintain speed, and travel safely in traffic, creating a risk of collision or becoming stranded in an unsafe location. Based on publicly available Hyundai materials, code P1326 is associated with the Knock Sensor Detection System (KSDS) and may indicate abnormal engine vibration, possible bearing-related engine damage, and reduced-power operation. Those materials also indicate that certain vehicles were eligible for software updates, inspection, and possible engine repair or replacement. I request that this issue be documented as a safety complaint and that the dealership perform a full diagnostic inspection, determine whether my vehicle qualifies for any applicable campaign or warranty extension, and provide appropriate repairs.

The engine consumes oil which is a known problem at Hyundai with the Tucson for the year 2020. The car has ~51,000 miles on it. When we took the car to the dealer at which we bought the car they diagnosed that the engine was burning oil. We were told that the engine is covered by standard warranty (10 yr. 100,000 miles). there is a process Hyundai has established for engines suspected of having this issue - first we had to have them check the oil and engine and then we had to drive the car 1000 miles and bring it back to them. when we brought it back they confirmed the the engine was consuming oil. They asked us to provide our maintenance records on the car (oil changes). We were able to find evidence of 5 oil changes but we know the we changed the oil on the car every 3-5k miles as we always do. The next step in the process is a combustion chamber cleaning which costs $1400 which would normally be covered by warranty but since we did not have all records of oil changes they will not cover it so we are being told we have to pay the $1400 out of pocket and also the the cleaning is not assured to fix the issue with the engine. If it fails to fix the issue the car will need a new engine which Hyundai is telling us they will not do under the warranty and it will be our financial obligation ($10-15K additional paid by us). It is clear that Hyundai is trying to shirk their warranty obligation to us. So we are stuck - we have to pay out of pocket for a service that may not resolve the issue and if it does not the car needs a new engine. If we sell the car back to the dealership they will only pay us $6000 when the car with a good engine is worth $15K. We take our obligation of regular maintenance seriously and have been loyal buyers at this dealership for >20 years never having an issue with proper maintenance. We think it unconscionable that Hyundai is leaving us holding the bag for a problem they know exists with theses engines

I recently purchased a 2020 Hyundai Tucson with a Nu 2.0 GDI engine. Shortly after purchase the engine completely failed and requires full replacement. When taken to a Hyundai dealership, they pulled an internal STUI report showing A95 branding, meaning Hyundai had previously denied warranty coverage blaming the prior owner for outside influence. This A95 designation does not appear on any consumer vehicle history report including Carfax or AutoCheck. I paid $13,500 for this vehicle with no knowledge of this engine history. The Nu 2.0 GDI engine in this vehicle is specifically named in Hyundai’s class action settlement. Hyundai is using internal branding to avoid responsibility for a known manufacturing defect while allowing these vehicles to re-enter the used car market with clean vehicle history reports, leaving consumers completely unprotected.

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 NHTSA review this failure and determine whether similar failures are occurring in 2020 Hyundai Tucson vehicles equipped with the 2.4L GDI engine.

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.

In August/September 2025 my mother's Tucson would randomly shut down on her (completely stall while driving) and she would not be able to turn it back on. If she waited a little while, then she would be able to turn the car back on but it was unknown when the issue would happen again. We took it to the dealer several times after each shutdown and the dealer stated it was not throwing a code and they could not diagnose the problem. The last time we took it to the dealer, the vehicle shut down while they were test driving it and they discovered it was a rear wheel sensor which is part of the ABS system. When the car would stall, lights on the dashboard would start flashing and the car would shudder to a stall. Since repairing that rear wheel sensor, the car has not exhibited the issue until 3 days ago when it again shut down randomly while she was in traffic. This, of course was terribly frightening for her as cars were honking at her and whipping around her vehicle. She was not able to get the car started. A police officer came and parked behind her car, calmed her down, and got her to try the car one more time and it did start up and she was able to proceed to the closest parking lot. After that we followed her home and have an appt. set to go back to the dealership. We are expecting the same run around at the dealer who charges excessive fees to diagnose and then repair the car. My Mom is [XXX] so this is a dangerous vehicle for her to be driving (really for anyone) as I am reading on line others reporting this same condition. I am expecting that they will find that a different rear wheel sensor has failed for which they will want another $800.00 to repair or maybe more now. Obviously we must get rid of this vehicle. It has less than 25,000 miles on it because she only drives to the grocery store and back. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ABOUT 18 MONTHS AGO, SOON AFTER AN OIL CHANGE AT THE DEALERSHIP, I CHECKED THE DIPSTICK. IT SHOWED LOW OIL AND I ADDED SOME. IT MADE ME THINK THAT THE DEALER HAD SHORTED THE OIL. NEXT OIL CHANGE, I HAD THEM SHOW ME THE OIL WAS FULL. IT SHOWED LOW FULL. I'VE BEEN CAREFULLY CHECKING THE OIL EVER SINCE AND HAVE CONTINUED ADDING OIL IN BETWEEN OIL CHANGES. 8 OR SO MONTHS AGO, I HAD THE OIL AND FILTER CHANGED. I MENTIONED THE PROBLEM TO THE MECHANIC AND HE SAID HE WAS AWARE HYUNDAI'S LOSE OIL. SINCE THEN, I HAVE CONTINUED TO ADD A HALF QUART AT LEAST ONCE A MONTH. I PARK ON CONCRETE AND THERE IS NO SIGN OF LEAKING OIL. I STARTED RESEARCHING THIS ISSUE AND FIND IT IS AN ONGOING PROBLEM WITH 2020 TUCSONS. I AM VERY CONCERNED WITH ENGINE DETERIORATION, SAFETY AND OIL LOSS.

Complete engine failure. Car was burning oil, wasn't aware. Since I am an on the road salesman I travel alot and get oil changes consistently. Then recently the engine oil light keeps coming on when rounding bends or stopping on a hill. I checked the dip stick and see oil is Half gone in between oil changes. The car stalled as I was approaching a dangerous intersection. Thankfully I was able to stop the car.