Hyundai Santa Fe Hybrid won't shift problems

Filed Oct 17, 2026 · Electrical, Engine · NC

This is the SECOND occurrence in the past two weeks. I was traveling on a HEAVILY trafficked 10 lane divided interstate, doing the speed limit on cruise control when the vehicle suddenly and inexplicably lost power. It went into "limp mode" (will not go over 30 mph). Thankfully i was able to negotiate to the shoulder but the maneuver was EXTREMLY dangerous as the rest of traffic was moving between 60 and 80 mph. It was harrowing and extremely frightening. Warning lights that were displayed- First, a "Check hybrid system" message appears. Accompanied by SEVERAL other warning lights. Eventually, a "stop vehicle and check power supply" message appeared and would not even move in "limp mode". This appears to be either a bent connection plug or fuel injector issue. The first time this happened ([XXX]) it was towed to Southern States in Raleigh, NC (I purchased it from Johnson in Apex) where they concluded nothing was wrong. They claimed no codes were available other than some low battery codes. This was a lie. The vehicle app showed two codes-POC7300 and P193700. They did nothing but recharge the battery by running the engine. I feel this dealership put me in danger by putting me back on the road without a proper diagnostic. A simple Google search shows that this is a problem with other vehicles of this make and model. I was told it wasn't their job to Google problems. It's only a matter of time before this serious defect kills someone with less luck and driving skill. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 14, 2026 · Electrical, Transmission · KY

Vehicle went into “ limp mode” It is a hybrid and the electric motor was in operative and top speed is around 35 MPH Unsafe to drive

Filed Oct 14, 2026 · Transmission · OK

On 2 seperate instances while driving down the highway the car suddenly loses power and goes into limp mode. The battery and the engine are not communicating to power the vehicle. It will no go over 30 MPH and then says to pull over and charge the battery.

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 9, 2026 · Electrical, Engine · NC

Vehicle lost power and went into "limp mode" at highway speed on a busy interstate. I was able to get to the shoulder and "limp" to the next exit (would not exceed 30 mph) but I was lucky to be able to safely get there. The dealership said it was a battery issue? They acted like it was no big deal. To unexpectedly lose power at highway speed on a busy interstate was very frightening. (I had to negotiate several lanes to get on the shoulder). I also feel Hyundai is not taking it seriously. The dealership (Southern States) said no incidents came up in the computer scan and they just ran the engine for an hour to recharge the battery. Nothing makes sense here. About 15 minutes before the incident a warning came on the screen reading "there may be a problem with the engine management system". After trying to "limp" home, it completely died, requiring a tow to the dealership. Another warning "stop vehicle and check power supply" came on the screen followed by the dash lights going crazy like a pinball machine. This could have ended a lot worse.

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 23, 2026 · Acceleration, Engine · SC

The primary component failure is within the hybrid powertrain control architecture, specifically involving the transmission control system or internal transmission clutches/modules (TCM/HEV control module). The vehicle utilizes a 6-speed automatic transmission integrated with an electric motor. During highway cruising, the transmission locks into a single gear ratio or a protective "limp mode," resulting in a total loss of normal acceleration despite high engine RPMs. The vehicle and its components are fully intact and available for inspection upon request. My safety and the safety of others were put at severe risk because the sudden, unexpected loss of acceleration occurred while traveling at highway speeds in active traffic. When the transmission locked and power cut out, the vehicle rapidly shed speed and dropped to a hazardous 20-35 mph on a high-speed roadway. This created an immediate, extreme risk of a high-speed rear-end collision from vehicles traveling behind me, forcing me to make defensive lane changes toward the shoulder without normal engine power to navigate safely. This happens without warning no notices or errors pop up when it happens. The issue is intermittent and has been presented to an authorized Hyundai dealership technician multiple times. Because the vehicle often resets its communication modules and temporary limp-mode parameters once the ignition cycle is turned completely off and back on, the dealership technicians have encountered difficulty pulling permanent historical diagnostic trouble codes (DTCs). However, the failure patterns match a widely documented, repeating issue among 2025 Santa Fe Hybrid owners regarding HEV torque calculation or loose engine wiring harness pin tension

Filed Sep 19, 2026 · Electrical, Engine · TX

While driving on a highway at approximately 60 MPH, the vehicle abruptly suffered a catastrophic loss of power and entered "Limp Mode," creating a severe safety hazard on the roadway. The vehicle was safely maneuvered and pulled over to the side of the road. Upon shutting the vehicle down and attempting to restart it after a few minutes, the powertrain completely failed to engage, refusing to shift into either Drive or Reverse. The vehicle became entirely disabled and required a flatbed tow to the dealership. ​Dashboard Warning Messages: - ​"Transmission Control System" - ​"Check Hybrid System" ​Diagnostic Trouble Codes (DTCs): - ​P177700 (Transmission / Hybrid Powertrain Control Malfunction) - ​P178400 (Transmission Control System / Electric Oil Pump or Actuator Circuit Fault)

Filed Aug 23, 2026 · Fuel system, Transmission · VA

Our family was driving on the highway at 55mph (I-495 in Alexandria, VA), the car instantly began to decelerate, despite having my foot completely on the accelerator and we had to limp over to the side of the road onto the shoulder. We had to wait multiple times for the hybrid motor to re-power itself to get off an exit at 10-15 mph. The car is now in "limp mode" and will not drive above 35 mph. This is the 4th time that we have had the same issue occur. Hyundai has provided a different fix each time, but they have yet to find an answer as to why this instant loss of acceleration keeps occuring. In the wrong circumstance. This instant loss of acceleration could be deadly and cause severe injuries to the individuals in the vehicle.

Filed Aug 20, 2026 · Acceleration, Engine · TX

sudden loss of propulsion / limp mode, particularly under load or at highway speeds.