2021 Hyundai Tucson problems

Filed Nov 9, 2026 · Engine · IL

URGENT ADD TO OPEN the federal safety agency COMPLAINT NUMBER: 11776255. On Monday, November 9, 2026, I presented my 2021 Hyundai Tucson to Service Advisor Grant Bode at Napleton Hyundai due to severe engine knocking. I have explicit photographic evidence of the advisor physically inspecting the vehicle's dipstick on the dealership lot and identifying that the engine oil was heavily overfilled past the maximum limit line. Despite this visual confirmation, the dealership issued a fraudulent Repair Order that completely omitted the oil overfill complaint and falsified the vehicle's drop-off timeline (stating 17:00 hours when the car was left at 7:45 AM). I refused to sign this inaccurate documentation and formally text-messaged the service advisor to dispute the omissions; the advisor has refused to reply. The vehicle currently remains parked on the side of the dealership lot overnight in this exact overfilled condition for a cold-start mechanical evaluation on Tuesday morning, November 10, at 7:00 AM. I am alerting the federal safety agency to active dealer manipulation and omission of safety defect evidence while an active federal complaint is open.

Filed Nov 8, 2026 · CT

Hyundai issued a emissions software update. To which in the state of [XXX] if not done you cannot get car registered. Had update done at lia hyundai of hartford ct on XXX at 2pm. Hyundai did the update and as soon as i got a mile down the road my vechile was sluggish unresponsive and that's with sport mode on. Next morning start suv up wait about a minute drive out and suv is shifting irradicly, I call lia hyundai they have me bring suv back. Before I bring suv back look up issue after software update and cone to find out hyundai knew of the software issue and still performed the update never informed me of the issue nothing. After they looked over suv hyundai told me they are aware of the issue corporate has to send out new software update to fix this update that was performed service men said would be end of the month possibly to get the new update informed me to warm car up for 3 minutes but even when car is warm idles rough sluggish and nonresponsive INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 7, 2026 · Engine · OH

on at least 4 different occasions this vehicle has at highway speeds been taken over by the engine vibration control which places the vehicle into a low power mode fortunately this did not happen while passing a semi other wise I would and my wife would not be alive .each time the vehicle was taken to the dealership and the sensor was replaced. and reset still keeps happening it is not the sensor when I first purchased this car Hyundai sent a letter requesting that they would compensate for taking this vehicle to their test facility to check it out I filled out the the paper work and sent it back wish I had saved copies.this car is a death trap and undriveable I never heard back

Filed Nov 6, 2026 · Engine · IL

COMPONENT FAILED: Engine / Powertrain assembly suffering from severe, documented manufacturing internal oil consumption. Available for inspection upon request. SAFETY RISK: My safety was severely put at risk by Napleton Hyundai (2600 Michigan Ave). On XXXX, Service Manager Heliose explicitly instructed me to deliberately drive the vehicle with known severe fluid loss until the engine completely "locked up" and seized on the road so Hyundai would replace it under warranty (Campaign TXXM). Advising a consumer to drive a vehicle until catastrophic engine seizure occurs at high speeds on public highways creates an extreme hazard—risking sudden stalling, loss of control, and major collisions. Furthermore, the dealer falsified a "goodwill" oil test by completely omitting mandatory tamper-evident safety seals on the dipstick and cap, releasing an unverified, unsafe vehicle into traffic. CONFIRMATION/INSPECTION: Severe oil burning was confirmed by Valvoline on XXX, where a fresh oil change ran completely dry within weeks with no external leaks. Napleton Hyundai acknowledged the engine warranty extensions (T6G, TXXM, DTC P132600) on XXX, but held the test hostage behind an unauthorized $1,400 chemical cleaning fee. The car has not been inspected by police or insurance as a crash has been avoided through manual monitoring. The service intake person ([XXX]) put on my invoice oil consumption check. I checked my engine to see if they placed any (Tamper-Evident Sealing) and the technician did not apply security seals, tape, or paint marks to the oil filler cap, dipstick, and drain plug! They fix this so they would not be responsible for my car engine WARNING SYMPTOMS/TIMELINE: Rapid internal oil depletion causing the engine to run dry within a 30-day window. Symptoms started after a routine oil change on XXX. No dashboard warning lamps are active, making the sudden dry engine an invisible, highly dangerous mechanical hazard. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 10, 2026 · Acceleration, Electrical · NV

loss of info system loss of all dash lights when I turn the engine off most of the time I loose all electrical systems (will not start for at least 15 minutes) if doors lock I can only unlock the drivers door with the auxiliary key. Has tried to shift in to park while driving (one time) Lost all power (engine and steering while crossing a highway (once only)

Filed Sep 23, 2026 · Engine · TN

I took my car in to Allen Samuals Hyundai dealership to have the 9C2 recall update completed on May 15th 2026. Ever since then my vehicle has had a rough hesitation or sputtering when driving. On May 18th Hyundai released a statement stating there was an issue with the update completed on the 9C2 campaign. However no resolution at the moment and to allow the car to warm up prior to driving it. I have only had my car for a little over 2 years and maintained everything a responsible car owner should. It only has 90k miles on it and had zero issues at all prior to the 9C2 campaign. I have spoke woth dealer and corporate numerous times nobody can give me a solution nor does it seem that anyone wants to. Since then the campaign has been closed and its almost as if it never existed. I do have an active case open with Hyundai 43228380 however they act as if they dont know anything about it. They are empathetic to the situation but can't really help or give a solution. All I want it my car that had zero issues prior to this update to run properly again. I dont even drive it much anymore for fear that it will mess my engine up.

Filed Aug 29, 2026 · Engine · NY

Engine knock sensor went off and now the engine needs replacement due to faulty cylinder rod.

Filed Aug 20, 2026 · Engine, Transmission · OH

See attached document for complaint.

Filed Aug 11, 2026 · Engine · 7,800 miles · FL

The contact owns a 2021 Hyundai Tucson. The contact stated that while driving at an undisclosed speed, the engine blew. No warning lights were illuminated. There was white smoke coming from the hood of the vehicle. The vehicle was towed to the dealer; however, the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 7,800.

Filed Jul 22, 2026 · PA

This vehicle burns oil at an alarming rate. I am getting oil changes every 3K miles, and when I take it in, the dipstick is dry. I receive no oil lights to tell me it is low. I just had to get spark plugs and the mechanic at the garage told me this was due to the oil consumption issue in these vehicles. I am at 71,000 miles.