Hyundai Sonata VIII (DN8) (2020 – 2025)

Reliability score : 8.4/10

The eighth-generation Hyundai Sonata (DN8) marks a radical departure from its predecessors. Introduced in 2020, it adopts a bold "four-door coupe" design and sits on the new N3 platform. The most significant change in terms of reliability is the definitive abandonment of the Theta II family engines (infamous for their fire risks and premature failure) in favor of the new generation of Smartstream engines. The Hybrid (HEV) version, particularly targeted here, stands out for its remarkable efficiency, the integration of a solar panel roof (on certain trims), and the Active Shift Control (ASC) technology that optimizes the automatic gearbox's shifts. In 2024, the model received a major facelift introducing the Seamless Horizon Lamp light signature and the addition of an all-wheel drive (AWD)

✅ Strengths

Reliability of the Hybrid (HEV) engine and excellent management of the thermal/electric transition
Definitive abandonment of the problematic Theta II engines in favor of reliable Smartstream blocks
Very reassuring manufacturer warranty (5 years unlimited mileage in Europe, 10 years/100,000 miles in the USA)
Cutting-edge onboard technology (Remote Smart Parking, comprehensive driving aids)
'12V Battery Reset' button on the hybrid, avoiding accessory battery failures
Bold design and significantly improved finish quality compared to the LF generation

⚠️ Weaknesses

DCT-8 gearbox on the N Line version (2.5 T-GDI) prone to recalls for loss of power
Multiple recalls concerning peripheral components (fuel tank, electric oil pump, windshield)
Soundproofing could be improved at high speeds (road noise)
Absence of all-wheel drive (AWD) on models prior to the 2024 facelift
Generally faster depreciation than its Japanese rivals (Camry, Accord)

🎯 Verdict

The eighth-generation Hyundai Sonata (DN8) is an extremely accomplished sedan that erases the heavy engine reliability problems (Theta II) of its predecessors. The Hybrid engine (2.0 HEV) is the most relevant choice: it is frugal, very reliable, and benefits from mature engineering. The naturally aspirated versions (2.5 GDI) are also excellent choices for their simplicity. The only reservation concerns the sporty N Line version (2.5 T-GDI), whose DCT-8 gearbox had a chaotic start. Although the car has undergone several peripheral recalls (fuel tank, oil pump, windshield), the main mechanical components (Smartstream engines) are robust. It is a highly recommended purchase, provided you verify that all manufacturer recalls have been performed.

Common issues

Dysfonctionnements du système d'infodivertissement (bugs, lenteurs) Low

🔧 Dès l'achat – 50 000 km

💶 0 – 300 € (mise à jour logicielle, réinitialisation)

Vérifier les mises à jour logicielles et la réactivité du système avant achat.

Décharge prématurée de la batterie 12V Medium

🔧 20 000 – 80 000 km

💶 150 – 300 € (remplacement batterie 12V)

Utiliser un chargeur d'entretien si le véhicule est peu utilisé ou pour de courts trajets.

Bruits ou grincements mineurs de suspension/train roulant Low

🔧 40 000 – 100 000 km

💶 100 – 400 € (graissage, remplacement petites pièces d'usure)

Tester le véhicule sur différentes surfaces pour détecter des bruits anormaux.

Estimated maintenance costs

Oil change	£70 – 130
Complete brakes	£220 – 480
Estimated annual budget	£550 – 1 100

Indicative estimates (independent garage, UK market). Prices vary by region and year.