NHTSA Complaint #11492345 — 2021 HYUNDAI SONATA

ENGINE issue reported to NHTSA

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Complaint Details

ODI Number	11492345
Vehicle	2021 HYUNDAI SONATA
Component	ENGINE
Date of Incident	August 24, 2021
Date Filed	November 4, 2022
Mileage	2,700 miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	AR

Consumer Description

The contact owns a 2021 Hyundai Sonata. The contact stated while driving 65 MPH and attempting to accelerate, the vehicle failed to respond with the check engine warning light illuminated. The contact also heard a knocking sound coming from the vehicle. The contact pulled over on the side of the road and turn off and restarted the vehicle and the vehicle started operating as designed. The vehicle was taken to the dealer and the contact was informed that the transmission and engine needed to be replaced. The manufacturer was contacted but offered no assistance. A case was filed. The failure mileage was 2,700.

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Recent Complaints for the 2021 HYUNDAI SONATA

#11719681 — FUEL/PROPULSION SYSTEM — February 22, 2026 — On i believe 1/14/26, my check engine light came on. Scheduled appt.for 1/16/26 for diagnostic. Several things were w...

#11719316 — VISIBILITY/WIPER — February 20, 2026 — The EHRS coolant system failed and had a leak causing the coolant to be excessively burned off as thick white smoke. ...

#11718194 — POWER TRAIN — February 16, 2026 — Vehicle suddenly lost heat in 30 degree weather. No warnings, check engine light, or temperature gauge indicators cam...

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#11716213 — FUEL SYSTEM, GASOLINE — February 6, 2026 — The contact owns a 2021 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the accelerato...