2025 Hyundai Santa Fe Hybrid fuel system problems

Filed Nov 5, 2026 · Engine, Fuel system · 14,362 miles · FL

The contact owns a 2025 Hyundai Santa Fe Hybrid. The contact stated that while driving 75 MPH, the vehicle unexpectedly lost power and decelerated to 30 MPH. While in heavy traffic, the contact pulled over to the side of the road, waited for the battery to charge, and drove to the dealer at a slow speed. The dealer inspected the vehicle and associated the failure with low ethanol and heavy contaminants in the fuel. The fuel pump was replaced, and a fuel injector service was performed, but 30 days later the failure reoccurred. The high-pressure fuel pump and the high-pressure fuel pump sensor were replaced and repaired. The contact stated that several days after the repair, the check engine warning light was illuminated. The vehicle was returned to the same dealer, and the contact was informed of a catalytic converter failure caused by the contaminated fuel. The manufacturer was made aware of the failure by phone. The failure mileage was approximately 14,362.

Filed Oct 23, 2026 · Fuel system · CA

While driving at freeway speeds in normal traffic conditions, the vehicle experienced a sudden, complete loss of motive power and rapid deceleration. The accelerator pedal became entirely unresponsive. No warning messages, check engine lights, or diagnostic indicators appeared on the dashboard during or immediately after the failure leaving me blind to the vehicle's state. This loss of propulsion on a high-speed live freeway created an immediate, extreme safety hazard, forcing an emergency maneuver across active lanes of traffic without predictable vehicle control. Component or System: Engine / Powertrain / Fuel System (High-Pressure Fuel Pump / Fuel Rail Sensor) Recurring / Prior History: This is a severe, recurring safety defect. The exact same highway power loss and deceleration event occurred last month. The vehicle was brought to an authorized Hyundai dealership where a repair was allegedly completed on 9/11/2026. However, that repair failed to address the root cause, and the dangerous failure has now repeated itself. The lack of a dashboard warning light masks a systemic component failure (strongly suspected to be the high-pressure fuel pump or associated pressure sensors failing to maintain adequate rail pressure under load

Filed Oct 22, 2026 · Fuel system, Transmission · IL

Beginning in early October 2026, my 2025 Hyundai Santa Fe Hybrid Calligraphy has repeatedly experienced a sudden and complete loss of propulsion while driving. During these incidents, dashboard warnings appear stating "Check Driver Assistance System" and "Check Hybrid System. Stop Safely." The vehicle indicates EV mode and completely loses the ability to accelerate or maintain speed. This is not reduced performance or hesitation. The vehicle loses all usable propulsion. The vehicle continues moving briefly while slowing, providing only a short window to reach the roadside. In moving traffic, this creates an extremely dangerous situation because there may be insufficient time or space to safely change lanes before the vehicle slows substantially. The failure occurs without advance warning. Shutting the vehicle off and restarting it temporarily restores normal operation, but the malfunction continues to recur unpredictably. On October 21, 2026, I brought the vehicle to an authorized Hyundai dealership specifically for this problem. The service department reported finding no diagnostic trouble codes and no applicable software updates. No cause was identified, and no repair was performed. The identical failure occurred again the following morning, October 22, 2026, less than 24 hours after the dealership inspection. The underlying cause remains unidentified. The dealership has not reproduced the malfunction, and the vehicle remains available for further inspection. This recurring complete loss of propulsion presents a serious collision risk to occupants and surrounding motorists, particularly in heavy traffic or at highway speeds.

Filed Oct 17, 2026 · Fuel system · GA

On September 28, 2026, my 2025 Hyundai Santa Fe Hybrid (49,682 miles) experienced a second sudden loss of propulsion while driving on the highway. The vehicle would not accelerate normally, the hybrid battery gauge dropped to a very low level, and the dashboard displayed a warning instructing me to stop the vehicle and leave the engine running to recharge the battery. I pulled over and waited with the engine running until the battery recharged sufficiently to drive to the dealership. This was the SECOND occurrence of a dangerous loss-of-propulsion problem. On August 21, 2026, while driving approximately 70 mph on I-75, the engine RPM increased dramatically despite the vehicle slowing down, as though the transmission had shifted into Neutral. There were no warning lights. The vehicle slowed to a stop and required towing to Hyundai of Kennesaw. Following the first incident, the dealership identified diagnostic code P0191 and replaced the fuel-rail pressure sensor under warranty. However, the September 28 failure occurred despite that repair. During the second dealership visit, technicians again identified P0191, confirmed the previously replaced sensor was functioning properly, and reproduced the problem during a road test. Live diagnostic data showed fuel pressure dropping to low-pressure pump readings. The dealership diagnosed a failing high-pressure fuel pump and replaced it under warranty. I retrieved the vehicle October 7, 2026, after the dealership reported a successful 10–12-mile road test. I am concerned that this repeated, sudden loss of propulsion presents a serious highway safety hazard, particularly because the initial repair did not prevent recurrence. I previously filed an the federal safety agency complaint regarding the August 21 incident.

Filed Oct 12, 2026 · Electrical, Fuel system · FL

The vehicle has a recurring intermittent failure that can leave it completely undriveable. When starting the vehicle, the instrument cluster displays “Check Hybrid System,” “Check Emergency Stopping function,” the check-engine light, and multiple warning indicators. The vehicle remains in Park and will not shift into Drive. This has happened multiple times. Disconnecting and reconnecting the 12-volt battery temporarily restores operation, but the problem later returns. After a reset, the check-engine light may remain illuminated for approximately one day before disappearing. During the most recent occurrence, the vehicle became disabled at approximately 8:00 PM in a retail parking lot while my family, including two young children, was with me. The vehicle would not move. We had to leave the vehicle and walk in the rain to obtain tools so the 12-volt battery could be disconnected and reconnected in order to get the vehicle operating again. The problem was reported in writing to a Hyundai dealership before an August 10, 2026 service appointment, including a request to retrieve and document stored and history diagnostic trouble codes. The condition remains unresolved and continues to recur. The vehicle is available for inspection upon request. Separately, this vehicle also has an unrepaired Safety Recall 288 involving the rearview camera. The vehicle has been taken to the dealer for recall service, but the recall remains incomplete because the dealer stated the required part was unavailable.

Filed Oct 10, 2026 · Engine, Fuel system · KS

Vehicle intermittently fails to accelerate, usually happens after vehicle has been sitting 10 hours or longer. Had back to dealership 4 times, 3 times dealer was unable to reproduce concern. 4th visit dealer installed injectors, concern seemed to be gone for about 2 months but is back again.

Filed Oct 8, 2026 · Electrical, Engine · FL

Driving vehicle on surface street, engine would not accelerate past 3000 RPM. No immediate codes or warnings, backed off gas pedal and went to accelerate again. This time many warnings illuminated. Second report from myself for same issue. Wife has had the vehicle in for same problem 4 times, last time was last week.

Filed Oct 2, 2026 · Fuel system · FL

Vehicle lost all acceleration, as if it were in Neutral. 3rd time this has happened in 14 months of ownership. Fault code generated in one instance, no fault found by dealer maintenance 2 other occasions

Filed Oct 1, 2026 · Acceleration, Engine · VA

The vehicle repeatedly loses motive power while being driven at highway speed. It slows even with the accelerator pressed to the floor, does not shift into higher gears, and drops to 40 to 50 mph. On [XXX], the vehicle lost power at highway speed while I was driving. I had to stop on the shoulder of the hwy. The vehicle could not be driven and was towed to the dealer. The dealer opened R.O. No. [XXX] on 9-3, recording mileage in of 23,595. It inspected the vehicle and confirmed the concern. It replaced the fuel rail pressure sensor (Part No. 35342-2M400) under warranty, confirmed a good idle with no codes, and performed a test drive of about three miles. The dealer reported the vehicle ready on 9-15-26; mileage out 23,596. On [XXX], within a few miles of picking up the vehicle after the first repair, the malfunction indicator lamp illuminated. We returned the vehicle to the dealer the same day; the dealer recorded the mileage in as 23,602. The MyHyundai app shows active Diagnostic Trouble Code P00BD00 (Mass or Volume Air Flow "A" Circuit Range/Performance — Air Flow Too High), powertrain system, recorded at 23,600 miles, with a listed date of [XXX]. The dealer returned the vehicle on [XXX]. On [XXX], four days after the 2nd repair, we brought the vehicle back to the dealer. We reported that it was idling high, at about 1,200 to 1,900 RPM while stopped, and that we had heard a low clicking sound since the repair. The dealer did not keep the vehicle. The next morning, [XXX], about 7 miles from home, the vehicle lost power on a bridge on [XXX]. It slowed to about 50 miles per hour and did not appear to shift. I stopped on the bridge with my [XXX] daughter in the car. VDOT responded. My husband and I switched cars. [XXX] then drove the vehicle. After about two miles it again lost power, and he had to leave the highway and use secondary roads at low speed to get to the dealer. The car is currently at the dealership. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 28, 2026 · Fuel system, Transmission · SC

I purchased my 2025 Hyundai Santa Fe Calligraphy Hybrid September 1, 2025. On June 24, 2026, I was driving on the interstate to work when my acceleration quickly dropped out and I wasn't able to go more than 30 MPH. This was terrifying to happen! I wasn't able to make it to an exit and had to pull off on the side of the interstate and await a tow. I took it to the dealership I purchased it from. Documentation stated that a fault code DTC P019100 (fuel rail pressure sensor) was identified. However, this sensor was not replaced. Instead, my paperwork indicates that the "air box was installed incorrectly at manufacturing and they fixed it." On August 13, 2026, I experienced a similar issue on a 45MPH secondary highway. I was able to restart it and get it to a Hyundai dealership a mile away (not the dealership I purchased from). After 5 days of no vehicle (and no loaner provided), the same code DTC P019100 presented and they replaced fuel rail pressure sensor. September 25, 2026, a critical error popped on my screen. Hyundai app says DTC P042000 (powertrain fault code). It's currently in the shop with the dealership I purchased from. I did put in a safety claim with Hyundai Customer Care and suggest all other users do the same to hold Hyundai accountable. I will attempt to update this if I can after resolution is hopefully identified. I'm very close to turning this car in and getting a more reliable vehicle. Which is unfortunate because I qualified for 0% APR financing when I purchased and I'll never get that deal again.