2021 Hyundai Tucson Engine Problems

While driving your 2021 Hyundai Tucson at 10 mph, you heard an abnormal clicking sound from under the hood with no warning lights. You pulled over and noticed white smoke leaking from under the hood that turned black and increased in intensity, leading to a fire that required the fire department to extinguish it. The vehicle was consumed by the fire and deemed a total loss at approximately 65,000 miles. The exact cause of the fire was not identified, and the vehicle was never diagnosed or repaired.

Your Tucson went into limp mode (severely limiting engine power) multiple times within days of purchase, forcing the vehicle to slow down to 7 MPH while driving at highway speed. The dealer replaced the NOX sensor three times and the catalytic converter, but the problem kept returning. This repeated failure suggests a serious issue with the emissions control system that wasn't fully resolved by the repairs attempted.

Your engine has been consuming oil excessively over the past 3+ years, requiring frequent top-ups. The dealer eventually confirmed the engine needs to be replaced, but is now denying the warranty claim despite their earlier assessment. You've been without your car for 2 weeks with no loaner vehicle provided.

Your engine stopped running on the highway just 3 days after an oil change, with no warning light beforehand. The dealership previously found your engine had no oil despite your regular maintenance schedule, performed an oil consumption test, and then denied warranty coverage. Your engine appears to be consuming oil abnormally, which may require the engine to be replaced or rebuilt.

Your engine started making a knocking sound that got louder as you accelerated, then your oil pressure warning light and check engine light came on. Your car began accelerating and decelerating on its own, forcing you to pull over across multiple lanes on the highway. This matches a known issue Hyundai has documented. The fix will likely require engine inspection, oil analysis, or possibly engine replacement depending on what's causing the low oil pressure.

Your 2021 Hyundai Tucson has stalled and lost power three times while driving in just 55 days of ownership, creating a serious safety hazard. Each time, the engine light flashed, RPMs spiked, and the car entered a severely limited mode where it couldn't exceed 3,000 RPM or 50 MPH—most dangerously during highway merging and on a busy road 300 miles from home. The dealer has refused to replace the engine despite the vehicle's extended warranty and service records showing prior engine problems. Diagnosing and repairing this issue will likely require engine inspection, connecting rod bearing replacement, or full engine replacement.

After having a knock sensor recall update performed on your engine, your check engine light started flashing while driving on the highway. Your vehicle automatically reduced speed to 20 mph without warning, forcing you to make an emergency exit and almost causing an accident. Your car went into a protective limp mode with no advance notice of the problem.

Your 2021 Tucson shut off unexpectedly while driving at highway speeds, accompanied by abnormal rattling sounds and loss of acceleration — with no warning lights to alert you beforehand. Multiple repair attempts at different shops identified issues with the engine rod bearing, ignition coils, and ultimately the engine itself, but the problem kept recurring even after repairs. The manufacturer was contacted but declined to provide further assistance.

Your engine is consuming oil abnormally, and you've already replaced three catalytic converters by 31,000 miles. Recently, your car started shaking, and the ignition coil and spark plugs were found to be faulty. Even though an oil consumption test passed, these repeated failures suggest an underlying engine problem that keeps damaging multiple components. The fix will likely involve a thorough engine diagnosis to identify what's causing the excessive wear on catalytic converters, ignition coils, and spark plugs.

Your check engine light keeps coming on while you're driving at different speeds. Multiple mechanics have found that your engine is burning through oil much faster than normal, and your dealer says the engine needs to be replaced. You're at about 89,000 miles and the manufacturer hasn't offered to help with the repair. The fix will require a complete engine replacement, which is a major repair.

Your 2021 Hyundai Tucson suddenly lost power while driving on the freeway and went into limp mode, forcing you to pull over safely. The check engine light is flashing, and a diagnostic scan found error code P1326, which Pep Boys flagged as requiring immediate attention. Your vehicle won't safely reach freeway speeds in its current condition. The issue may require engine sensor replacement or ignition coil service, depending on what the dealership finds when they investigate code P1326.

Your engine is consuming more oil than normal between service intervals. You may need to add oil more frequently than expected, or you might notice low oil level warnings on your dashboard. This could indicate internal engine wear or a leak that needs diagnosis, and may require engine inspection or seal replacement.

Your oil warning light comes on about 1,500 miles before your scheduled oil change, and the dipstick shows no oil even though you keep adding more. You're having to top off the oil repeatedly between service intervals, which could lead to engine damage if not addressed. Your dealer should inspect the engine for an oil leak or faulty oil level sensor.

While driving, your check engine light began flashing and your engine started bucking or jerking. Despite regular maintenance with documented oil changes, Hyundai has refused to cover the issue under warranty, citing that this is a known problem affecting 2021 Hyundai Tucsons. A mechanic will need to diagnose the engine fault code and address the underlying cause of the bucking.

While driving at 70 mph, your engine warning light started blinking on and off, and your car's power was reduced, limiting your speed to 60 mph. This is typically a sign that your engine's computer detected a problem and entered a safety mode to protect the engine. You should have the diagnostic trouble codes read with a scanner to identify the underlying issue.

Around November 1, 2024 my 2021 Tucson check engine light came on. I had this checked out and was told by a mechanic that it was the Camshaft Sensor. I had this repaired and then on November 23rd while traveling to Ohio my Check Engine light started flashing and needed immediate attention. I was on the West Virginia Turnpike when this happened and it caused the car to go no more that 45 mph in a zone marked 65mph. We got this immediately checked out and repaired and then 4 days later the same thing happened while in Ohio. It was taken to Deihl Hyundai in Massillon, Ohio and they once again made this repair with video evidence of said repairs. Once again while driving at freeway speed on December 23rd my car experienced this malfunction. The same dealership fixed it once again with direction from Hyundai. I am concerned for this is an ongoing problem and could cause serious injury to myself or others in my vehicle if this would happen once again on a freeway.

The contact owns a 2021 Hyundai Tucson. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed, but the vehicle failed to accelerate as intended. The check engine warning light was illuminated. The contact stated that the vehicle failed to exceed 20 MPH. The contact stated that the failure had occurred while driving on a busy highway. The contact safely pulled over to the shoulder of the roadway. The vehicle was then towed to the dealer, where it was diagnosed with engine knock sensor failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was opened. The manufacturer informed the contact that the repair was not covered under an unknown recall due to a lack of maintenance records. The contact was advised to contact the Better Business Bureau. The failure mileage was approximately 60,000.

My check engine light came on in the vehicle and immediately the acceleration declined and I wasn’t able to go above 50 mph. I brought the vehicle to the dealership to which the code 1326 came up. I was told it is a rod bearing engine failure and I need a new engine for the vehicle. I was also told my vehicle doesn’t qualify for the recall already made for this damage and code number.

Crank sensor went bad and engine needs rebuilt

I was contacted by Hyundai last year about a possible recall on my engine so I brought it in October 2023 to have it checked out. I was told that everything with the car was fine. Fast forward to last week 02-21-2024 and my engine starts shutting off while driving ON THE HIGHWAY? I have it towed to a new dealership in Jacksonville FL Jenkins Hyundai I believe. They inform me that it is indeed the engine and it will be replaced for free under warranty. However, it’s been over a week and the parts for the car are still not available. I have researched online and found I am far from the only one this has happened to. I was not given a loaner car and they did not offer to pay for my rental but I was told they would reimburse me. I was also told that they would just pay every week for a rental car for me but then I was later told that that was a flat out lie. After March 7th when the rental car I have is to be returned I can no longer afford a rental car and will not have access to reliable transportation. This could potentially result in me losing my job. This is unacceptable and Hyundai should be investigated and held accountable for selling cars they know have faulty engines.

September 15, 2023 while driving on the expressway my engine light came on. Vehicle towed to World Hyundai dealership and it was diagnosed as engine seized.

The contact called on behalf of his girlfriend who owned a 2021 Hyundai Tucson. The contact stated while driving 5 MPH in the driveway, there was steam coming out from under the hood. There was no warning light illuminated. The contact parked the vehicle. The contact stated that as he opened the hood, flames came out. The contact's girlfriend also saw flames coming out of the A/C vents. The contact closed the hood and assisted his girlfriend and his pet in exiting the vehicle. The contact stated that his girlfriend slipped and fell while exiting the vehicle. The contact's girlfriend sustained back pain and the contact sustained a flash burn. There was no further information provided. The contact stated that the entire vehicle caught on fire. The contact was able to extinguish the fire with the assistance of the fire department. A fire department report was filed. No police report was filed. The insurance company technician determined that the fire originated from the engine compartment. The vehicle was totaled by the insurance company and remained in the contats driveway. The dealer was not notified of the failure. The manufacturer was notified of the failure, and a case was opened. The failure mileage was approximately 25,000.

March of 2021 I purchased a new Hyundai Tucson SEL. I have performed all required maintenance (at the dealer no less). In May of 2022 the dealer performed the recall Campaign 966. Since that time, my Tucson has had to go to the dealer 5 times for a P1326 code. This resulted in the check engine light flashing and the car going into protection or limp mode. The vehicle would not accelerate past 30 mph and would not exceed 2000 RPM. This has happened as I have accelerated from either a stop or while in traffic. As of yet the dealer has been unable to permanently resolve the problem. They have replaced the knock sensor. The dealer has replaced spark plugs. The dealer has also replaced the catalytic convertor. They also recently scoped the cylinders and cleaned the engine with pressurized engine detergent. In the days and weeks prior to the check engine light, I can always tell that failure is imminent. The gas mileage will slowly drop off during both highway and city driving. Additionally, I can feel through the gas pedal hesitations and slight rhythmic pulsing. Lastly, I can feel gradual power loss in acceleration and very slight hesitations in acceleration as well.

Recall Code 966 22-01-028H-1 Think and investigation is needed on these recalls. Apparently the engine can catch fire while the motorist is driving. I'm scheduled to drop my car off on the 9th and was told they may need to keep for 3-5 days. Thes vehicles should not be on the road at all and rental cars should be provided free of charge until the manufacturer works out all the problems