Genesis 3.5T
3.5L SmartStream twin-turbo V6 — 375 hp, dual injection, twin-scroll turbos. The mechanical evolution of the G6DP with better fuel delivery and thermal management. More responsive than the 3.3T it replaces, smoother at idle, and the dual injection eliminates carbon buildup. Timing chain rattle from 20-30k miles on early production units — tensioner suspect. Turbo seal failures documented on 2024 models as low as 16k miles, with oil leaking from the right turbo. Same fuel pump recall as the 2.5T (2021-2023). CVVT phasers share architecture with older Hyundai V6 engines where longevity past 100k is questionable. Expected lifespan: 150-180k miles before major work.
Korean flagship — features for days, dealers for none
The G90 throws everything at the wall: rear-seat entertainment, massaging seats, e-supercharger on higher trims. The 3.5T delivers smooth, effortless power. Highway Driving Assist recall (false braking) is unsettling. Battery drain issues and mirror motor noises are early-adopter territory. The concierge service model means no traditional dealer — great concept, inconsistent execution. Depreciation will be brutal, making the used market the play.
Engine Weaknesses 5
Low oil warning at 16k miles leading to turbo replacement documented on 2024 models. Oil leaking from the right turbo with significant acceleration loss. Multiple reports suggest turbo seal failures on early production 3.5T engines. Warranty-covered on current models.
Symptoms: Low oil warning, blue/white smoke, acceleration loss, turbo whine
Same Integrated Thermal Management System issues as the 2.5T. Software glitches cause false overheating warnings or actual overheating from valve failures. The twin-turbo V6 generates more heat, making ITMS reliability more critical. Software updates help but hardware component replacement sometimes necessary.
Symptoms: Overheating warning, limp mode, coolant temperature spikes, reduced power
Same fuel pump recall as the 2.5T SmartStream. Pump failure causes engine stall while driving. Affects 2021-2023 model years across G80, GV70, GV80 equipped with the 3.5T. Free dealer repair — verify recall completion on any used purchase.
Symptoms: Engine stalling, loss of drive power, check engine light, no restart
Chain rattle reported from 20-30k miles on some early production units. Tensioner wear is the suspected cause. Full chain service recommended around 80k miles. The 3.5T is young enough that long-term data is limited.
Symptoms: Rattling noise at startup, chain noise under load, check engine light in severe cases
Dual Continuously Variable Valve Timing (CVVT) phasers lose accuracy past 100k miles. Power loss, increased fuel consumption, and eventually no-start conditions. The 3.5T is still young enough that most examples have not reached this threshold, but the mechanism is shared with older Hyundai V6 engines where CVVT failures are documented.
Symptoms: Power loss, rough idle, increased fuel consumption, check engine light, no-start in severe cases
Vehicle Weaknesses 3
The HDA corner radar may falsely detect a vehicle, causing sudden unintended braking while driving. Affects 2023-2026 G90. Software update available from dealer. Unsettling at highway speeds.
Same parasitic drain issue as the G80. The G90 has even more always-on systems (e-supercharger, seat massage preconditioning, connectivity). Battery dies after a few days of sitting. Battery tender recommended for infrequent drivers.
Panoramic sunroof produces rattling and creaking over uneven surfaces. Shade roll-up assembly not properly torqued during factory assembly. Dealer fix involves dropping the headliner and re-torquing fasteners. Unacceptable in a $90k+ sedan.