2021 Hyundai Sonata Hybrid problems, complaints & recalls
Most-reported problem areas: Engine (17) · Electrical System (16) · Power Train (4)
🧭 Reliability snapshot
Compared against other Hyundai Sonata Hybrid model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (51)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Electrical System 2026-10-27 · 26-GI-003H · Service Bulletin/Repair Instructions
this bulletin provides information related to the navigation and head unit software changes introduced in the 2026 2nd navigation map and software update. the changes may vary depending on vehicle type, model, and navigation system. refer to the 2026 2nd navigation map and software update key improv
Engine 2026-10-08 · 26-EM-016H TSB · Service Bulletin/Repair Instructions
some vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. this bulletin outlines the combustion chamber cleaning procedure for vehicles diagnosed with this condition. all internal combustion engines consume some engine oil during normal operatio
Engine 2026-10-07 · 26-EM-015H TSB · Service Bulletin/Repair Instructions
certain vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. this bulletin provides the inspection and repair procedures for vehicles exhibiting this condition. all internal combustion engines consume engine oil as part of normal engine operatio
Air Bags 2026-04-10 · DTN DL · Other
the national highway traffic safety administration (nhtsa) has identified the presence of substandard and dangerous driver’s-side airbag inflators manufactured by jilin province detiannuo automobile safety system co., ltd. (dtn). these inflators were not supplied, approved, or authorized by the vehi
Air Bags 2026-04-10 · DTN DCS · Other
the national highway traffic safety administration (nhtsa) has issued an urgent safety advisory regarding dangerous, counterfeit driver‑side airbag inflators manufactured by jilin province detiannuo automobile safety system co., ltd. (dtn), that have been identified in u.s. vehicles following prior
Engine 2025-12-18 · 25-EM-007H TSB · Service Bulletin/Repair Instructions
some elantra (cn7, cn7a), kona (os, sx2), and sonata hybrid (dn8 hev) vehicles equipped with 2.0l engines may illuminate a warning lamp for dtc p218100 (cooling system performance) related to the integrated thermal-management module (itm). follow the service procedure in this bulletin to install a s
Showing the 6 most recent of 51 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-09-18 · Power Train“my lincoln nautilus (~9,180 miles) logged 6 "powertrain malfunction / reduced power" alerts in the [xxx] telematics system between xxx (xxx at 7:59 pm and 8:16 pm; xxx at 1:07 pm and 1:39 pm; xxx at 11:16 pm; and xxx at 10:56 am). out of the 6 logged events, i experienced severe loss of motive power during two of them. on xxx, while driving 70 mph…”
2026-09-18 · Fuel/Propulsion System“the vehicle was brought to an authorized hyundai dealer to have service campaign tbh and 94b completed. these campaigns were explicitly designed to prevent known mechanical defects (cracked ehrs assemblies and high-voltage battery errors). the software patches failed to protect the vehicle. the physical hardware has now catastrophically failed exac…”
2026-08-05 · Engine“the vehicle experiences sudden, complete electrical power loss while driving at speed on highways and city streets or on the parking. all digital displays turn off, the engine shuts down, and power-assisted steering and braking are instantly lost without prior warning, presenting an extreme collision risk. the issue first occurred in august 2025 a…”
2026-06-22 · Electrical System“i purchased this vehicle pre-owned approximately two years ago and have since developed concerns about its reliability, particularly related to the electrical and hybrid systems. in hindsight, i suspect these issues may be part of the reason the original owner traded it in to a carmax dealer. shortly after purchasing the vehicle, i began experienc…”
2026-05-22 · Electrical System“the vehicle’s 12-volt electrical system repeatedly loses power within about 1 hour of sitting. the car becomes completely unresponsive (cannot unlock or start) and requires use of the built-in 12v battery reset button to restore power. this occurs frequently and makes the vehicle unreliable and potentially unsafe, as the car may become inoperable…”
2026-04-09 · Engine And Engine Cooling“see attached document for complaint.…”
2025-08-11 · Electrical System“owned car since 09/2024 with 64k miles. battery system (12v/hybrid system) has shut down and died 47 times since 04/2025 - no shut downs before then. car with ~69k miles at that time. dealer had car six weeks (05/17 to 07/05/2025) and it died “a number” of times and report that hyundai claims this is “what the car is supposed to do.” since 07/05 …”
2025-07-28 · Electrical System“this is on my 2021 hyundai sonata hybrid limited - for the 7th time the vehicle has been completely dead and unresponsive. i have had to gain entry to the vehicle using the manual key and press the "jump" button to get the vehicle to start. the hyundai dealership ran a bunch of battery updates to the 12 volt battery several weeks ago and said that …”
2025-07-10 · Electrical System“what component or system failed or malfunctioned, and is it available for inspection upon request? random total electrical failure (doors won't unlock, car unresponsive) how was your safety or the safety of others put at risk? difficult to gain manual entry to car, particularly in dark situations has the problem been reproduced or confirmed by a de…”
2025-06-30 · Electrical System“every day the car is dead, have to take the manual key out pop door cover off unlock car manually push the 12v reset button and hold fob to start/stop button for car to work again. happens daily. …”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.