2021 Hyundai Santa Fe Hybrid

The contact owns a 2021 Hyundai Santa Fe Hybrid. The contact stated that while driving at various speeds, the vehicle lost motive power. The contact was able to restart the vehicle; however, the vehicle failed to exceed 40 MPH. The contact stated that the failure reoccurred several times while driving. The contact stated that on several occasions, the vehicle lost motive power. A message indicating that there was no power was displayed, and the check engine warning light was illuminated. Additionally, a red Hybrid warning light with a stop safely message was displayed. The contact stated that the Hyundai App displayed the Power Train and Chassis indicated the contact needed to schedule a service. The vehicle was towed to the dealer, where it was diagnosed and determined the vehicle had either bad fuel or the vehicle was refueled while the engine was running. Additionally, the gas cap was left open. The contact stated that the failure persisted, and the vehicle was taken to the dealer several times. The dealer replaced the rocker cover gasket and oil gasket to resolve a leak. The vehicle was at the local dealer awaiting Field Technical Engineer inspection. The vehicle was not included in NHTSA Campaign Number 22V746000 (Power Train). The manufacturer was made aware of the failure, and a case was opened. The approximate failure mileage was 31,000.

I have been taking my 21 Santa Fe hybrid limited into the dealership for a year and a half for the same code . Powertrain code P040B00, and to this day they can not repair this issue. I looked it up and a ton of us are having issues with this same code. It should be investigated, and customers should be warned. Hyundai needs to recall these vehicles or provide a solution. A year and a half is unacceptable

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.

While traveling 70 mph the vehicle had a sudden loss of engine and battery output performance while driving and began losing speed despite the accelerator being fully depressed. There was a very rapid decrease in speed, and no warning chime activated per manual. “Check Hybrid System. Stop Safely, triangle warning displayed.” Observed battery indicator rapidly deflecting left and right. The vehicle would not accelerate and had to be coasted through four lanes of traffic to get to the shoulder of the highway. While on an SOS call with Bluelink, who was unable to see the location of my vehicle, Oil Light illuminated, and a message on the dash said “Check Battery Discharge.” After the first Bluelink Operator was unable to assist in dispatching a tow truck due to the inability to see the vehicle’s exact location, the second Bluelink Operator was able to assist and dispatch a tow truck to the location and tow the vehicle to the closest dealership. The vehicle could not be turned on or placed in neutral. Was given a jump start to place in neutral to tow. Upon arrival at the dealership, the key fob would not register inside the vehicle for the service manager and technician to move with the tow truck operator. The vehicle was evaluated by the dealership and the only reported issue was a signal error that was present when the vehicle arrived at the dealership after being towed. Dealership reported radar was not vertical and contributed that to the cause of loss of acceleration on the highway despite not having identified it before or being a result of being towed. I requested this be reported if truly the cause since that could be catastrophic. The matter was considered resolved by the dealer since it couldn’t be duplicated. This unknown, continued sudden loss of output power, acceleration, and electrical power is a Serious Safety Defect and significant impairment to the vehicle, posing a fatal risk for the operator and other motorists on the road. Occurred at 24618 miles.

While I was traveling 70-75 mph the vehicle had a sudden loss of engine and battery output performance and I began losing speed. There was a very rapid decrease in speed, and no warning chime activated per manual. “Check Hybrid System. Stop Safely, triangle warning displayed.” The vehicle would not accelerate despite pressing the gas pedal all the way to the floor and had to be coasted off the interstate through three lanes of traffic to get to the shoulder. No fault indications were present in the Bluelink app despite warnings present on the dash. Mileage was 6506 at the occurrence, vehicle was in Smart. Adaptive Cruise Control and Lane Keep Assist were being utilized, when disabled acceleration did not return. I was advised to turn off the car and turn it back on due to no faults present via remote troubleshooting tools and no dealership within 150 miles, and the vehicle resumed operating okay. After taking it for service at the next available “emergency slot” two weeks later at my local dealership and the car being there for one week, they reported condition could not be duplicated, the vehicle is operating to the manufacturer's specifications. I noted my serious concerns and that a serious safety defect that allows a vehicle to lose all acceleration on the highway and the vehicle not sounding a warning chime can lead to dangerous scenarios on the road and I was assured there was nothing wrong with my vehicle and it would not occur again as it was operating within manufacturer specifications. The vehicle did have a subsequent failure of this same type at a later date. It was not investigated by anyone other dealership. The manufacturer failed to address the loss of acceleration concerns when requested. No chime activated but should have received one per manual. A safety warning was present on the dash, “Check Hybrid System. Stop Safely” service warning triangle. I am unsure how long it appeared before the loss of acceleration due to no chime.