What are the most common Genesis G90 problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2018 Genesis G90 has 10 documented issues. The most frequently reported are: Water intrusion into starter solenoid causes electrical short and engine-compartment fire, Air suspension failures — leaking air struts/bags, compressor burnout and rear sag, Left turbocharger oil feed pipe cracks and leaks oil onto exhaust manifold, causing engine-compartment fire. Of these, 3 are rated critical and should be addressed promptly.
Is the Genesis G90 reliable?
The 2018 Genesis G90 has 10 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 3 issues are rated critical: Water intrusion into starter solenoid causes electrical short and engine-compartment fire and Air suspension failures — leaking air struts/bags, compressor burnout and rear sag and Left turbocharger oil feed pipe cracks and leaks oil onto exhaust manifold, causing engine-compartment fire. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Genesis G90 problems?
Repair costs for known Genesis G90 issues range from $0 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Water intrusion into starter solenoid causes electrical short and engine-compartment fire, typically costs $0-$300 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2017-2019 Genesis G90 Water intrusion into starter solenoid causes electrical short and engine-compartment fire?
Water can enter the starter solenoid and cause an electrical short, which may lead to an engine-compartment fire while the vehicle is parked or being driven. Genesis instructed owners to park outside and away from structures until repaired. Covered by NHTSA Recall 24V107 (Hyundai… Repairs typically run $0-$300. Severity: high.
What is the 2017-2022 Genesis G90 Air suspension failures — leaking air struts/bags, compressor burnout and rear sag?
First-generation G90s use an electronically controlled air suspension that is a recurring high-cost failure point. Owners report pinhole leaks in the air struts/bags, failed leveling (height) sensors, exploded air dryers and burnt-out compressors, producing a saggy or uneven stan… Repairs typically run $800-$4,000. Severity: high.
What is the 2017-2022 Genesis G90 Left turbocharger oil feed pipe cracks and leaks oil onto exhaust manifold, causing engine-compartment fire?
On G90s equipped with the 3.3L twin-turbo V6, the original left-hand turbocharger oil feed pipe and hose assembly was manufactured from a material that becomes brittle after prolonged heat exposure and repeated heat/cool cycling. The pipe cracks and leaks pressurized engine oil d… Repairs typically run $0-$800. Severity: high.
What is the 2017-2022 Genesis G90 Panoramic sunroof creaking, rattling and wind noise (loose/under-torqued frame bolts)?
First-generation (DH) G90 sedans with the large panoramic glass roof commonly develop creaks, rattles and squeaks from the roof/headliner area, plus wind-noise vibration over the glass. Root causes owners and dealers have found include sunroof frame/track attachment bolts that ba… Repairs typically run $300-$3,000. Severity: medium.
What is the 2017-2023 Genesis G90 Repeated 12V battery drain / dead battery from head unit and modules drawing power when parked?
Owners across model years report the 12V battery going flat after the car sits a few days. A common documented culprit is the radio/head unit continuing to draw current after shutdown, along with other parasitic draws that exceed the normal <50 mA key-off current. Leaving the key… Repairs typically run $250-$1,500. Severity: medium.
What is the 2017-2020 Genesis G90 8-speed automatic harsh/jerky upshifts and low-speed lurch (solenoid TSB)?
Owners report harsh, jerky 2-3, 3-4 and 4-5 upshifts, hesitation and a low-speed lurch/jerk on the 8-speed automatic. A subset of 2018 V6 cars reported the transmission slipping toward Neutral from Drive/Reverse. Hyundai/Genesis issued a TSB attributing harsh upshifts to two shif… Repairs typically run $0-$1,500. Severity: medium.
What is the 2017-2020 Genesis G90 5.0L Tau V8 GDI intake-valve carbon buildup and some oil consumption?
The 5.0L Tau V8 is gasoline-direct-injection only (no port injectors to wash the valves), so intake valves accumulate carbon deposits over time, which can cause rough idle, misfire and reduced performance at higher mileage. Some 2018+ owners also report elevated oil consumption (… Repairs typically run $400-$800. Severity: medium.
What is the 2017-2020 Genesis G90 Infotainment/navigation screen freezes or goes blank, requiring reboot?
The DIS infotainment/navigation head unit intermittently freezes, becomes unresponsive, or displays a blank screen — including a 'Navigation Activation in Progress' message that leaves the map unavailable. It can also drop Bluetooth/connectivity. Distinct from the second-gen inst… Repairs typically run $0-$1,200. Severity: medium.
What is the 2017-2022 Genesis G90 Coolant leaks from water pump and thermostat housing?
Coolant weeping/leaks are frequently reported and seen by technicians on first-gen G90s — commonly from the water pump and thermostat housing on the 3.3T, plus O-ring/gasket seepage on the 5.0. Left unaddressed, slow coolant loss risks overheating and cylinder-head damage on the… Repairs typically run $350-$900. Severity: medium.
What is the 2017-2022 Genesis G90 Power trunk fails to close/latch or release, often due to lid misalignment?
Owners of the power-operated trunk on the first-generation G90 report intermittent failures where the decklid will not fully close and latch when lowered, or will not release and rise when commanded (some report a stick roughly every few openings). The trunk uses a power latch (c… Repairs typically run $400-$1,500. Severity: low.
