2023 Genesis G-Class problems

“While accelerating to highway speeds, the vehicle suddenly experienced a significant and continuous loss of power. Even with the accelerator fully pressed, the vehicle would not increase speed beyond roughly 50 mph. Based on the behavior and previous service history, the issue appears to be related to the engine, fuel delivery system, or overall powertrain. The incident created a serious safety concern for both the occupants and surrounding traffic. The vehicle could not properly accelerate, merge, or respond to normal highway conditions. Hazard lights had to be activated, and the vehicle remained in the slow lane for an extended period to avoid faster-moving traffic. The issue was consistent and repeatable throughout the drive. Multiple attempts to accelerate resulted in the same lack of response, and the loss of power persisted for the duration of the trip. The vehicle has not yet been inspected following this occurrence because when turned off and turned back on, the issue goes away and happens sporadically. It is also worth noting that the vehicle previously underwent a manufacturer-covered repair involving the high-pressure fuel pump, for which a warranty…”

“I noticed my driver head light starting to get condensation after doing further research i found it’s a common manufacturer defect especially for the g70s. I took a further look by removing my front bumper & noticed 3 cracks starting from each screw on the front of the headlight mounting. after doing more research i found out it’s a common manufacture problem with over torquing the screws & after inspection that’s exactly why my headlight lense is cracking from bottom to top, as it’s too much force where the screws are & with hot & cold temperatures plastics & such move creating them to break. my safety is put at risk due to the corrosion building in the headlight causing my blinker to malfunction & my daytime lights to stop working. i’ve got pulled over for my daytime lights not being on as it looked like a headlight was out. it also is causing my car to short sometimes itll turn of driver monitoring & lane departure all of it, i will have lights on the dash for a few seconds or minutes & my car will act strange even when going in reverse the backup camera pulls too much electricity sometimes causing it all to go black & car will die randomly then turn back on…”

“Headlights are defective and the seals give out and allow condensation to build on the inside making the light not function properly and then burn out as the condensation accumulates. Lane keep assist cannot function properly if traffic merges in, has trouble determining the lines and want to over correct as it completes the merge. Also drifts during the merge. Scary.”

“My 2023 Genesis G70 has recurrent, intermittent engine power loss and stalling while driving, including on highways. The check engine light comes on intermittently and the engine can run roughly. After a stall, restarting can restore operation, but the issue recurs. Unexpected power loss in highway traffic puts occupants and other road users at risk. The exact failed component is UNKNOWN. The vehicle had repeated prior visits to Genesis of Auburn without resolving the concern. Southtowne Hyundai and Genesis of Newnan held it from August 19 to September 4, 2026. Repair order 184931 documents the stalling complaint and reports of misfires on cylinders 2, 4 and 6. It records multiple test drives, inability to duplicate the concern, and no stored or active diagnostic trouble codes at that visit. The vehicle was returned without a repair for this concern. On September 9, 2026, five days after pickup, the same stalling/loss of power recurred. The Genesis diagnostic system reported P0300, P0302, P0304 and P0306 at 67,847 miles immediately afterward. I sent Genesis Consumer Affairs videos and the diagnostic information that day. On September 16 I requested another…”

“While driving at highway speed, the vehicle experienced a sustained loss of motive power. Despite the accelerator pedal being fully depressed, the vehicle would not accelerate beyond approximately 62 mph. Based on the symptoms and prior service history, the malfunction appears related to the fuel/propulsion system, engine, or powertrain. The vehicle is currently parked and available for inspection upon request. This failure placed the safety of the occupants and other motorists at risk. The vehicle was unable to safely accelerate, merge, pass, or respond to traffic conditions. Hazard lights were activated, and the vehicle was forced to remain in the slow lane of the highway for an extended period to avoid being struck by faster-moving traffic. The problem was reproducible and occurred repeatedly during the same trip. Acceleration was tested multiple times, and each attempt resulted in the same loss of power with no response to throttle input. The condition persisted for the entire drive. The vehicle has not yet been inspected following this incident. However, the vehicle previously received a manufacturer warranty repair involving replacement of the…”

“The vehicle experienced a sudden emergency braking intervention on the highway. Alert came on and it said emergency breaking with curved red arrow and the car slowed down from around 70mph-60mph. Lane assist was on but the car was not on cruise control. The problem was resolved after pressing the accelerator. I was not hit but the could have been a dangerous situation if someone was right behind me.”