The quietest Sonata in our set — two fire-risk recalls to close and one part to ask about: the injectors.

The generation-wide fuel-tank recall reaches the 2023 as its final model year. Hyundai states that a damaged check valve can allow air into the fuel tank, causing it to expand and contact hot exhaust components, melting the tank — and a melted tank can leak, raising the risk of fire. The remedy is a free check-valve inspection and replacement, fuel-tank inspection and replacement if damaged, and an engine-computer software update. VINs became searchable on 19 November 2025 and letters went out from 13 March 2026, so many 2023s will still be waiting. One 2023 owner filed against it after the failure spread: recall 286, as Hyundai numbers it internally, causing a heat-module failure, a cylinder-two misfire and high-pressure fuel trouble. Check the VIN before you view the car.

This is what 2023 owners actually write about. Hyundai's bulletin names the mechanism exactly: vehicles with the 2.5-litre GDI Theta III engine — GDI meaning Gasoline Direct Injection, and this is the naturally aspirated version, not the turbo — may show one or more misfire codes because the direct-injection fuel injectors are leaking internally, caused by the injector's internal filter breaking apart. The fix is to replace all four injectors. The bulletin covers 2021 to 2023. Owners describe losing power at highway speed, the car sputtering at a stoplight, jerky acceleration and deceleration with a check-engine light, and repeat failures — one had injectors fail twice within sixteen months. On a car of this age most of these are warranty repairs, which is precisely why you should ask whether the work has been done rather than discover it later. Get any stored codes read and ask for the service history.

The 2023 N Line keeps the 2.5-litre turbo and the eight-speed wet dual-clutch automatic. It falls outside recall 22V746, which stops at 2022, but the underlying part story continues in Hyundai's bulletins: cars setting high-pressure electric oil pump codes can require the whole gearbox replaced, moisture in the oil-pump connector corrodes the terminals, and a software update revising clutch touch-point learning to improve judder covers model years from 2021 onward, with some gearboxes receiving a redesigned clutch spring. A 2023 owner names it plainly, calling the problem common on Hyundai and Kia vehicles with the Theta III 2.5-litre turbo engine, and other filings describe the car jerking and then dropping into limp mode. On an N Line, drive it from cold in traffic, feel for shudder, and ask whether the transmission software has been updated.

The 2023 Sonata Hybrid's 15 complaints repeat the generation's two hybrid faults. Coolant disappears and the exhaust blows white smoke — Hyundai's bulletin covers 2020 to 2023 Sonata Hybrids and attributes it to an internal leak at the EHRS, the Exhaust Heat Recovery System built into the centre muffler, which uses exhaust heat to warm the engine up faster; one owner had the bulletin work done at 82,000 miles and reports the leak stopped, and a separate bulletin revises the engine-computer logic for a low-coolant-flow code on 2023 hybrids specifically. The other is the battery management system draining the 12-volt battery so the car behaves as if it is dead. There is also a small cluster of hybrid-system failures — sudden shutdowns at 60 mph with a "Hybrid System Failure" warning, one traced to an AC motor power cable that was replaced four times without curing it. Ask about coolant history, white smoke, and any hybrid-system warning.

A small but physical 2023 pattern with no bulletin behind it. The eighth-generation Sonata uses push buttons instead of a shift lever, and several owners report the car failing to engage Park: one pressed Park after stopping and the car rolled forward into their garage door, another says it has happened more than once. A separate owner argues the layout itself is the hazard, because the buttons require the brake to be pressed to change direction and mistiming leaves you in the wrong gear — they ran over a portable toilet reversing on a slight incline. Complaint-sourced, so treat it as a habit to build rather than a defect to fix: watch the dash confirm P, and use the parking brake every time.

Two 2023 owners report the sunroof or moonroof shattering with no impact — one on the freeway at low speed with no overpass above, describing the glass as bowing upwards as though it burst outwards, with the cloth headliner catching most of the fragments; another says their insurer told them it happens to Hyundais often. There is no Hyundai bulletin for this in the Sonata file and no recall, so this is an owner-reported pattern, not a confirmed programme. Comprehensive insurance is the practical backstop. Worth knowing before you pay extra for the glass roof.

Four model years clear of the seventh-generation car, none of the Theta II connecting-rod-bearing material applies to a 2023 — different engine family, different platform. Hyundai's anti-theft campaigns for vehicles without an engine immobilizer list model years 2011 to 2019 on their Sonata bulletins, so the 2023 sits outside that population. The white-paint warranty extension bulletins stop at 2019. And recalls 22V746, 21V524, 21V00M and 22V196 all stop before 2023. That leaves two recalls, the injectors, and normal used-car diligence — the shortest list of any Sonata year we cover.