2017 Hyundai Sonata Hybrid Powertrain (other) Problems

What component or system failed or malfunctioned, and is it available for inspection upon request? Vehicle stopped accelerating and flashing check engine light went on. Vehicle reported "Check Hybrid System." Dealer believes it was loose pins in a HCULDC connector that may have caused loss of communication. How was your safety or the safety of others put at risk? Lost acceleration on a highway and was nearly hit trying to get off of the road. Has the problem been reproduced or confirmed by a dealer or independent service center? Piazza Hyundai of Pottstown, PA reproduced the issue. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Dealer secured loose pins. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No.

NHTSA ID

11612874

Incident

Sep 3, 2024

While driving, car started to lose power. Warning lights started flashing to turn off vehicle to recharge battery. Car lost all power. Car was towed to dealership. Dealer started diagnostic testing, and first thing that was noted is that all oil had drained from car and that crank shaft may now be damaged. Prior to incident, no warning lights came on for service, engine or oil lamp. Dealer and internet searched confirm this has been happening to this model recently.

NHTSA ID

11612120

Incident

Aug 30, 2024

Engine Shut Off Without Warning problem of the 2017 Hyundai Sonata Hybrid While driving the car on the freeway, it will jerk forward and then shortly after lose power. I pull over (luckily haven't been killed yet) on the side of the freeway. I've taken my car to a Hyundai dealership third times. All Three time I was stranded on a busy california highway. I have looked into this warning over a year and no one seems to know the problem. This should be a recall and all Hyundai dealers should be made aware of what this warning is. We as Hyundai owners need answers and help.

NHTSA ID

11553536

Incident

Oct 30, 2023

2017 Hyundai hybrid Sonata Check hybrid system turn off engine, It’s been at a dealership for three months last time. after year later same issue again.

NHTSA ID

11520073

Incident

May 1, 2023

ABRUPT AND TOTAL LOSS OF ACCELERATION AT FULL THROTTLE AT OR NEAR HIGH RPM SHIFT POINTS. THIS BEHAVIOR CAN BE RELIABLY REPRODUCED BY "FLOORING IT" (ALL THE WAY, INCLUDING KICKDOWN) AND NOT LETTING GO - AS IF ONE IS EXECUTING A PASSING MANEUVER. THE POWER LOSS WILL OCCUR AT THE NEXT SHIFT POINT AFTER KICK DOWN, AND WILL NOT BE CLEARED UNTIL THE ACCELERATOR PEDAL IS RELEASED AND RE-APPLIED - OR AFTER APPROXIMATELY 15 TO 20 SECONDS AFTER THE OCCURRENCE IF THE DRIVER DOES NOT RELEASE THE PEDAL. IN CASES WHERE THE PEDAL IS NOT RELEASED AFTER THE POWER LOSS, THE VEHICLE WILL SURGE SUDDENLY AFTER THE CONDITION HAS CLEARED AND REPEAT THE BEHAVIOR DESCRIBED ABOVE. THIS BEHAVIOR CAN BE REPRODUCED IN ANY DRIVE PROGRAM MODE (ECO, NORMAL, SPORT, ) AND IN BOTH AUTOMATIC AND MANUAL SHIFT SELECTION MODES. Has been occurring since purchase. Parks Hyundai of Gainesville, Fl. states unable to reproduce, but a Parks' employee confirmed occurrance.

NHTSA ID

11462376

Incident

Apr 27, 2022

ON 7/17/19 MY CAR LOST POWER WHILE DRIVING ON CITY STREET. UNABLE TO STEER OR CONTROL VEHICLE. TOOK TO DEALER WHO SAID THERE WERE NO ERROR CODES SHOWN AND THAT IT WAS THE ELECTRIC OIL PUMP. ON 8/12/19, THE SAME THING HAPPENED WHILE DRIVING ON EXPRESSWAY. COMPLETE POWER FAILURE WHILE VEHICLE WAS IN MOTION. UNABLE TO STEER OR CONTROL CAR. TOOK BACK TO DEALER. AGAIN, NO ERROR CODES FOUND. THEY LATER CLAIMED THAT A RELAY HAD MELTED AND THAT WAS THE PROBLEM. ON 12/28/19, AGAIN DRIVING 70MPH ON BUSY EXPRESSWAY, VEHICLE LOST ALL POWER AND I WAS UNABLE TO STEER CAR. TOOK TO DEALER ON 12/29 AFTER IT HAPPENED A SECOND TIME IN TWO DAYS. THERE WERE UNABLE TO LOOK AT VEHICLE THAT DAY AND TOLD ME TO BRING BACK NEXT DAY. IT STALLED AGAIN WHILE I WAS LEAVING PARKING LOT, I ASKED THE MAINTENANCE TECH TO COME AND LOOK TO SEE WHAT WAS HAPPENING, HE REFUSED. DROPPED CAR OFF ON 12/30. ON 1/2/20, DEALER CALLED TO SAY NO ERROR CODES FOUND, AFTER DRIVING 100 PLUS MILES, WERE UNABLE TO DETERMINE CAUSE OF PROBLEM AND I SHOULD PICK UP MY VEHICLE. I EXPLAINED THIS IS UNACCEPTABLE. THEY CALLED ME BACK LATER CLAIMING IT IS THE ELECTRIC STEERING COLUMN PORTION OF MOTOR CONTROL POWER STEERING RACK AND WANT $1800 TO FIX. THIS IS A MAJOR SAFETY ISSUE, LOOSING COMPLETE POWER AND ABILITY TO STEER WHILE DRIVING. DEALER HAS DONE NOTHING TO REASSURE ME THAT THIS IS THE ACTUAL PROBLEM.

NHTSA ID

11299316

Incident

Dec 28, 2019

Mileage

80,000 mi

AFTER STOPPING AT A REST AREA ON 2 SEPARATE OCCASIONS, THE CAR REFUSED TO START AND A MESSAGE WAS DISPLAYED TO CHECK HEV SYSTEM. AFTER REPEATED TRIES TO START IT THE MESSAGE DISAPPEARED AND THE CHECK ENGINE LIGHT CAME ON. EVENTUALLY, THE CHECK ENGINE LIGHT WENT OFF, THE CAR SEEMED TO BE WORKING PROPERLY AND WE RESUMED OUR TRIP. WE TOOK THE CAR TO THE DEALER AND THEY CHECKED FOR ERRORS AND FOUND NONE. WE ARE RELUCTANT TO PUT THE CAR ON ANY MORE TRIPS OUT OF TOWN.

NHTSA ID

11183267

Incident

Feb 8, 2019

Mileage

37,500 mi

ABRUPT AND TOTAL LOSS OF ACCELERATION AT FULL THROTTLE AT OR NEAR HIGH RPM SHIFT POINTS. THIS BEHAVIOR CAN BE RELIABLY REPRODUCED BY "FLOORING IT" (ALL THE WAY, INCLUDING KICKDOWN) AND NOT LETTING GO - AS IF ONE IS EXECUTING A PASSING MANEUVER. THE POWER LOSS WILL OCCUR AT THE NEXT SHIFT POINT AFTER KICK DOWN, AND WILL NOT BE CLEARED UNTIL THE ACCELERATOR PEDAL IS RELEASED AND RE-APPLIED - OR AFTER APPROXIMATELY 15 TO 20 SECONDS AFTER THE OCCURRENCE IF THE DRIVER DOES NOT RELEASE THE PEDAL. IN CASES WHERE THE PEDAL IS NOT RELEASED AFTER THE POWER LOSS, THE VEHICLE WILL SURGE SUDDENLY AFTER THE CONDITION HAS CLEARED AND REPEAT THE BEHAVIOR DESCRIBED ABOVE. THIS BEHAVIOR CAN BE REPRODUCED IN ANY DRIVE PROGRAM MODE (ECO, NORMAL, SPORT, ) AND IN BOTH AUTOMATIC AND MANUAL SHIFT SELECTION MODES, AND IS ESPECIALLY PREVALENT AT SPEEDS ABOVE 45 MPH WHERE SUDDEN FULL THROTTLE COMMAND CAUSES KICKDOWN. THE DRIVETRAIN SHOULD RESPOND RELIABLY WHEN IT IS COMMANDED FULL-THROTTLE. A SUDDEN POWER LOSS AT A SHIFT POINT DURING A FULL THROTTLE MANEUVER IS UNSAFE: (1) IT DISORIENTATES THE DRIVER AND; (2) CAUSES UN-COMMANDED, UNEXPECTED, AND RAPID CHANGES IN DRIVING FORCE, WEIGHT DISTRIBUTION, FRICTION, AND REACTION FORCES WHICH COULD LEAD TO A LOSS OF CONTROL.

NHTSA ID

11094148

Incident

May 16, 2018

Mileage

20,000 mi

1: AT THE BEGINNING OF OCTOBER 210, WHEN THE MOTORWAY EXITS FROM EAST TO WEST, SUDDENLY THE ENGINE DOES NOT WORK (PICTURED) AND THE CAR DECELERATES DIRECTLY FROM 70 MILES TO 30 MILES. THE BRAKES CAN NOT WORK FULLY. STEP ON THE GAS PEDAL MUST STEP ON MULTIPLE STEPS TO RELAX THE THROTTLE, DEPRESS THE ACCELERATOR AGAIN, FROM THE SECOND MOVE TO MOST OF THE MOST OUTSIDE HIGH-SPEED, DO NOT KNOW DO NOT KNOW ABOUT THE CRASH ABOVE THE SPEED. SUCH A HIGH SPEED, I GO HOME, STOP THE FLAME, AND THEN OPEN EVERYTHING IS NORMAL. LATER, DEALER REPAIR CAN NOT FIND THE PROBLEM, UNTIL NOW THERE ARE THREE TOTAL FAILURES, MANUFACTURERS REPAIR IS NOT GOOD, DO NOT SOLVE THE PROBLEM, IT HAS BEEN DRAGGING

NHTSA ID

11067273

Incident

Oct 10, 2017

Mileage

5,500 mi

DRIVING ON THE FREEWAY AT APX. 65MPH, THE CAR LOST ENGINE POWER AND DISPLAYED A"STOP VEHICLE AND CHECK BRAKES" MESSAGE. I HAD NO POWER TO THE WHEELS, SO COULD NOT SAFELY MOVE OUT OF TRAFFIC AND WAS STUCK IN THE ACTIVE FREEWAY LANE WITH CARS ZIPPING BY. AFTER THE CAR COASTED TO A STOP, I TURNED IF OFF AND BACK ON. POWER RETURNED AND I WAS ABLE TO DRIVE NORMALLY. THE ESC, ABS, AND AUTO HOLD LIGHTS WERE ON, BUT WENT OFF AFTER APX. 15 MINUTES OF DRIVING. THE DEALER COULD NOT FIND ANY PROBLEM NOR WERE ANY ERROR CODES RECORDED IN THE VEHICLE. THIS IS A VERY SERIOUS SAFETY ISSUE - I AM VERY FORTUNATE NOT TO HAVE BEEN STRUCK AND KILLED IN THAT SITUATION.

NHTSA ID

10993312

Incident

Jun 3, 2017

Mileage

7,000 mi