2025 Hyundai Santa Fe Hybrid: check engine light

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 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 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 9, 2026 · Engine · NC

The car suddenly loses acceleration; the engine still runs and revs to ~3,000 RPM. The car can't drive over 35mph; no check engine light at all. The dealer said a high-pressure fuel pump caused it and replaced it under warranty; after 3 days, the same problem happened again. This is extremely dangerous if the vehicle is on a highway and suddenly loses acceleration. This could be fatal for the driver and other vehicles around it.

Filed Sep 2, 2026 · Engine, Fuel system · NV

While driving, the vehicle suddenly lost motive power on the highway and would not accelerate beyond approximately 20 mph despite accelerator input. There were no warning lights or check-engine light. The condition created a safety hazard because the vehicle could not maintain normal traffic speed. Hyundai dealer has been unable to determine the cause on other vehicles with the same problem, and was trying to discourage me from reporting this. They also said that they'd keep the car for 3 days, and likely return it with no diagnosis, so do I really want to go through this? They seemed unconcerned that this is a very dangerous issue in a highway.

Filed Aug 24, 2026 · Brakes, Engine · TX

My vehicle randomly slows it self down while driving. I would be pressing the gas and the car would voluntarily slow down on its own with no warning. This problem can lead to plenty of accidents due to me or any other driver around me being unaware when my vehicle will brake on its own. The problem has been confirmed by Hyundai Patterson of Tyler, Texas and they have worked on my car twice to fix the issue and it still hasn't been fixed. The issue started about a month ago and when the incidents would occur in the beginning their would be no warning lights on my vehicle’s dash. As of recently there maybe a check engine light that will pop up when the incident occurs. It's a hit or miss.

Filed Dec 7, 2025 · Acceleration, Engine · NC

Description of the Problem: I own a 2025 Hyundai Santa Fe Hybrid Limited with approximately 3 months of use. While driving on highway, the vehicle suddenly stalled displaying “Hybrid System Failure-Stop by side”. I had to stop on shoulder and restart, drove it couple of days and it happened again. Engine would not start, leaving the vehicle stuck in EV mode only with no ability to accelerate properly, Vehicle wouldnt go beyond 35mph. The vehicle then stalled and became unsafe to operate on a public road. After restarting, the vehicle displayed a Check Engine Light. Tookk it to the dealer and the dealer reported DTC P1122000, but did not provide clear evidence of an internal system fault. The dealer claimed the event was caused by “20% ethanol in the fuel,” which is inconsistent with U.S. pump labeling laws. When I checked my credit card entries around the time for refuel, all of them are reputed gas stations with nothing lower than "87" gas which is in alignment with car manufacturer's recommendation. This sudden stall created a serious safety hazard, and I am concerned this may be a broader issue with the 2025 Hyundai Santa Fe Hybrid drivetrain, fuel system sensors, or hybrid control module. I am requesting the federal safety agency to look into whether similar complaints exist, as this failure mode can result in loss of propulsion at speed, putting occupants at risk.

Filed Oct 12, 2025 · Engine, Fuel system · TX

My 2025 Hyundai Santa Fe Hybrid has experienced repeated, dangerously abrupt power loss while driving at highway speeds, causing the vehicle to go into "limp mode" without any warning or prior indication. This safety hazard occurred on three separate occasions: First Incident: 7/29/25; Mileage: 9,205. Situation: While traveling at 70 MPH on the interstate, the vehicle suddenly decelerated to 35 MPH and entered "limp mode" without any warning lights or notifications. Dealer Repair: Replaced ignition coil assembly (Parts: 27301R1H, 27301-2M417). Second Incident: 8/27/25; Mileage: 12,898 Situation: While accelerating to 65 MPH on the interstate, the same loss of power and abrupt forced deceleration occurred, again with no warning. This sudden loss of speed created a serious safety hazard for me and other drivers. Dealer Repair: Replaced fuel pump & O Ring Assy-High Pressure (Parts: 35326-2M500, 35305-2m414 LH). Third Incident: 9/25/25; Mileage: 14,830. Situation: Traveling at 70 MPH on the interstate, the car abruptly decelerated, again entering limp mode. This caused surrounding vehicles to swerve to avoid rear-ending me, putting myself and others at risk. Dealer Repair: Replaced High Pressure Sensor (3534202M400), Packing Fuel Pump (31115-0W000), and Fuel Pump and Tube Assy (31119-L1400). In all three cases, there was never any warning light, check engine notification, or app alert before the incident. Hyundai and my dealership confirmed and replicated the issue during each repair. I have reported the vehicle to the Texas DMV, Hyundai and the dealer.These recurring “limp mode” incidents have repeatedly jeopardized my safety, my family’s safety, and the safety of the public due to the sudden, unanticipated loss of power at high speeds. Since the underlying issue persists and has required three separate major repairs, I am fearful for my safety while operating this vehicle and believe it constitutes a serious safety defect needing federal investigation.

Filed Jul 19, 2025 · Electrical, Engine · DE

Stopped for gas, vehicle started but would not go into gear, engine lights indicated 'Check hybrid system', warning lights shown. 1/2 hr on the phone with dealership to assist. No problem detected when returning to home dealer. Second episode occurred, vehicle at dealer for the past 4 weeks. Episode repeated at dealership yet "no abnormalities are detected with diagnostics ".