2020 Hyundai Elantra Cruise Control Problems

Cruise control on 55mph, car has slowed down going straight no uphill or downhill and accelerator did not work nothing blocking the accelerator. Had to pull over to a shoulder to shut engine off and on to drive. Tapping cruise control up to speed up in regulated area such as from 55 to a 65mph zone.. cruise control speed lowered. Attempting to speed up with accelerator still only slowing down. 3 times this year I had to change spark plugs within a 6 month period Error code p0302. Replaced battery alongside. Continues p0302 code. Replaced all coils and spark plugs still p0302. Climbing uphill vehicle sometimes looses power that happened twice in 2025 and twice in 2022. 3 times in 2024. That i must turn on hazards and floor the accelerator to gain speed on up hills in neighborhoods going 25 mph. I have dropped to 10 mph. I get oil change regularly. Always when due. Every few months I make sure to get a full car inspection to make sure everything is in proper working order.

When cruise control is activated the rpm increases 700 to 1000 rpm regardless of the speed

WHEN CRUISE CONTROL IS ACTIVATED, THE ENGINE RPM AUTOMATICALLY INCREASES BY ABOUT 700 RPM. AT 75 MPH, THE ENGINE RPM IS 2300. WHEN CONTROL IS ACTIVATED, ENGINE RPM INCREASES TO 3000 RPM AND REMAINS THERE. THIS DECREASES GAS MILESGE AND INCREASES WEAR ON ENGINE.

CONDITIONS: WHILE DRIVING ON A FLAT ROAD SURFACE/TERRAIN, MAINTAINING A CONSISTENT SPEED, AND CONSISTENT PEDAL APPLICATION. IF YOU SET CRUISE CONTROL, THE RPMS WILL JUMP BY 500 OR MORE. THE JUMP IN ENGINE SPEED IS MAINTAINED, NOT TEMPORARY. THE SUSTAINED INCREASE IN ENGINE SPEED WILL REDUCE FUEL ECONOMY AND INCREASE MECHANICAL WEAR ON THE VEHICLE. THIS ISSUE HAS BEEN PRESENT SINCE THE VEHICLE WAS PURCHASED BRAND NEW. I DO HAVE A VIDEO BUT THE 5 MB FILE SIZE LIMIT PREVENTS ME FROM UPLOADING.

WHILE DRIVING AT 60 MPH ON A HIGHWAY I ENGAGED THE CRUISE CONTROL. TO MY SURPRISE THE ENGINE SPEED INCREASED BY 500-700 RPM. THIS SEEMS TO ME TO BE A DEFECT IN THE WAY THE INTELLIGENT VARIABLE TRANSMISSION (IVT) SHOULD OPERATE OR ANY TRANSMISSION SHOULD OPERATE. THE RESULT IS THAT GAS MILEAGE WILL DECREASE AND ENGINE WEAR INCREASE AS A RESULT OF HIGHER RPM THAN NECESSARY. I BELIEVE THIS IS A DEFECT AND SHOULD RESULT IN A RECALL BY HYUNDAI TO CHANGE THE OPERATION OF THE TRANSMISSION. THERE ARE MANY COMPLAINTS ABOUT THIS ISSUE FROM OWNERS. I HAVE CONTACTED MY DEALER AND THEY, IN TURN, CONTACTED HYUNDAI. I HAVE ALSO CONTACT HYUNDAI CUSTOMER CARE. AS OF THIS WRITING I HAVE NOT RECEIVED ANY INDICATION FROM HYUNDAI THAT THIS CONDITION EXISTS AND THAT IT IS A PROBLEM. I'M HOPING YOU CAN REQUIRE A RECALL TO ADDRESS THE ISSUE.

2020 HYUNDAI ELANTRA. CONSUMER WRITES IN REGARDS TO CRUISE CONTROL PROBLEM. *LD THE CONSUMER STATED ENGAGING THE CRUISE CONTROL CAN CAUSE HIGHER RPMS TO MAINTAIN THE SET SPEED. THIS CAN CAUSE EXTRA WEAR ON THE MOTOR AND DECREASED GAS MILEAGE. THE CAUSE OF THE FAILURE MAY BE DUE TO THE NEW VARIABLE SPEED TRANSMISSION.*JS