2020 Hyundai Palisade: misfire or rough idle

Filed Sep 4, 2026 · Engine, Transmission · WA

On August 14, 2026, while driving and decelerating, I heard a knocking sound from the engine and the vehicle had difficulty downshifting. As the transmission shifted from second gear to first, the engine stalled immediately and the vehicle dropped into neutral while on the roadway. I lost propulsion in traffic. The vehicle behind me nearly rear-ended us due to the sudden stall. My children were in the vehicle. All dashboard warning lights illuminated at the moment of the stall. I was able to restart the engine and move the vehicle slowly, in first gear only, into a nearby parking lot. The check engine light came on at that restart and has remained on since. The vehicle sat parked and off for approximately 90 minutes. Before restarting, I checked the engine oil level and it was within the normal range. On startup, my children and I both heard a loud knocking sound and noticed an unusual smell, and the engine idled roughly while in Park. I drove approximately 15 minutes home with the rough idle continuing. On arrival the vehicle smelled hot, with a burning odor, although the temperature gauge read approximately mid-scale and was not in the high range. The check engine light remained on and the oil level was again confirmed to be within range. The vehicle has been out of service since the incident and is currently at a dealership awaiting diagnosis. This is a 2020 Hyundai Palisade with approximately 93,000 miles at the time of failure. A sudden loss of motive power in a travel lane is a safety defect.

Filed Aug 25, 2026 · Engine · NC

My 2020 Hyundai Palisade (3.8L GDI Lambda II V6) consumes engine oil at a rate that empties the crankcase between scheduled oil changes, with no warning lamp illuminating before the oil is gone. This creates a risk of engine seizure and sudden loss of motive power in traffic. The vehicle has repeatedly run rough and felt as though it would stall when slowing or stopping. On 3/10/2025 at 57,026 miles I brought it to a Hyundai dealer because it felt like it was about to stall at traffic lights. The technician found no measurable oil on the dipstick, 4.5 quarts low, and found the camshafts out of time as a result. On 11/25/2025 at 69,851 miles the oil light flickered and the engine ran rough and stuttered. The dealer checked the dipstick and again found no oil on it at all. This was only 5,614 miles after a documented oil and filter change performed by that same dealer. No warning illuminated until the crankcase was already effectively empty, which I consider inadequate warning of imminent engine failure. Consumption has continued and worsened: 1 quart low at 77,202 miles (4/22/2026), 1.5 quarts low at 81,350 (5/14/2026), and 1.2 quarts low at 82,927 (8/11/2026), the last only 1,577 miles after an oil change. Hyundai TSB 23-EM-008H sets the failure threshold at 1 quart per 1,000 miles for all gasoline engines. The dealer twice billed Hyundai operation code 21000FCC, which that bulletin defines as payable only after an initial oil consumption test result of NG (failed). Two combustion chamber cleanings were performed at Hyundai's expense (1/2026 and 5/2026). Neither resolved the consumption. On 5/14/2026 the dealer submitted a request to Hyundai Motor America to replace the engine. Hyundai denied it verbally and has provided no written decision, case number, or reason. This is our family's primary vehicle and remains in service. I must check the oil weekly to keep the engine from running dry. Complete dealer service records are available.

Filed Jul 31, 2026 · Engine · NY

On or about XXX I brought my vehicle into the dealership as my 2020 Hyundai palisade suffered a severe, sudden engine malfunction while driving at highway speeds. The vehicle began shaking violently, losing power, and making loud mechanical noises forcing me to navigate dangerous highway traffic to get it to the dealership. Prior to the failure, in XXX, the vehicle was brought into an authorized dealership as the vehicle would not drive properly, very slow acceleration and the vehicle feeling like it was stalling causing a danger to the road. . The dealership performed an inspection on the vehicle and diagnosed "carbon buildup due to mileage and age," they performed an authorized emissions software update, changed the oil, and performed a paid fuel injection cleaning. The dealership did not issue a safety warning or advise against driving the vehicle long distance back to [XXX]. A few months after this service, the vehicle suffered total engine failure. Professional teardown of the Hyundai Lambbda ll V6 engine show that unresolved carbon buildup and software defects lead to piston ring failure, severe misfires, oil starvation, and sudden loss not motive power. Operating a vehicle experiencing severe mechanical shaking and power loss at highway speeds poses an immediate risk of an accident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed May 15, 2026 · Engine · MI

Driving down road in early afternoon at about 35 mph. Car began to run rough (jutter) then almost immediately stalled. The car’s engine icon appeared on the screen along with verbiage indicating service engine soon. After about 3-5 minutes, I started the car and drove it directly into a parking lot approximately 100 feet from where the car stalled. I had the car towed to a repair shop in town. The following day the service adviser called after doing diagnostics and indicated the car had no oil (It was approximately 3,400 miles since my last oil change). The technician explained there were some minute cracks in the oil filter cap but nothing that would warrant such a large loss of oil. An oil change was done, the oil filter cap was replaced with an aftermarket cap, and the car was returned to me. I have contacted the service department of the Hyundai Dealership where the car was purchased and am awaiting a call back.

Filed Feb 25, 2026 · Electrical, Engine · 89,000 miles · TX

The contact owns a 2020 Hyundai Palisade. The contact stated that the vehicle was consuming an excessive amount of oil. There was an oil-burning odor coming from the vehicle. There was a misfire coming from the engine before the vehicle stalled. The Auto START/STOP was activated while driving. The feature was turned off, but quickly reactivated. There were no warning lights illuminated. The vehicle was taken to the local dealer, who was unable to determine the cause of the failure. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 89,000.

Filed Jan 16, 2026 · Engine · FL

I'm reporting a serious safety issue with my 2020 Hyundai Palisade (3.8L V6) involving excessive oil consumption without low-oil warning lights. Timeline: Oil changed: August 13, 2025 → Engine stalling/rough idle → Checked Oct 27, 2025: completely out of oil Oil changed again: October 27, 2025 → Same symptoms recur → January 16, 2026: completely out of oil again Usage: ~300 miles/week (1,200 miles/4 months) using full synthetic 5W-30—far below Hyundai's 7,500-10,000 mile interval. Safety Risk: No low oil warning despite total depletion x2, risking catastrophic engine failure while driving. Known Lambda II V6 issue per TSB 20-01-0001. Request: Investigation into oil consumption recall and sensor failure.

Filed May 8, 2025 · Electrical, Engine · AL

UNKNOWN. Rough idling. Throwing itself into park & turning the engine off but dash stays on like engine is running. Engine, oil, battery, theft light does come on when this happens but go away after starting car. Has been to mechanic multiple times but showing no codes & unable to figure out the cause of it. The car can not just idle either. Has been going on for over 6 months.

Filed Apr 22, 2025 · Engine, Fuel system · OR

Acceleration is causing misfires or the engine to feel like it “skips” Also grumbles or bubbles when I shut down.