NHTSA Complaint #11487859 — 2021 HYUNDAI SANTA FE HYBRID

While driving on the highway, when I pushed on gas pedal the car would not accelerate, I was uncertain if I was losing power of the vehicle, luckily it maintained the current speed and did not decelerate,but I was unsure at the moment if I was losing complete power, because it wasn't responding, it felt like the car was going to stall similar to when you run out of fuel. This occured for around 20 seconds, i would guess, long enough to notice that the car was not responding and continued to not respond,and to be concerned from a safety perspective. The night before I had filled the fuel tank and I noticed to guage that predicts fuel mileage kept changing by 3-5 miles difference,back and forth repeatedly, before I even left the fueling station and as I continued to drive. I'm unsure if that is related to the driving performance issue of not accelerating the next day. The next morning when the non acceleration occurred the predicted fuel mileage was consistent. The next time I drove the vehicle following the non accelerating issue, there was an error that popped up on my digital dash stating "A possible condition with your engine control system has been detected. A full system check is recommended to be done when convenient. Please contact your local dealership to schedule an appointment." Also, the check engine light came on. MyHyundai app showed a DTC - P040B00, DTC system - powertrain, DTC sub system- EMS. I took the vehicle to the Hyundai dealership to confirm that the car was safe to drive or if I should rent a car until it can be further inspected. They read the codes and said it is safe to drive and no additional information, I will be taking the car back to the dealership in a week, which is their first available appointment with a hybrid certified technician. Both the dealership and Hyundai corporate customer service states there are no current recalls, but through other car forums, it appears to be a similar issue that has occurred with other Hyundai models.