Adaptive Cruise Control problems of the 2020 Hyundai Elantra

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.

This vehicle has what is now known as "phantom braking" since day of delivery over two years ago and was reported to NHTSA previously by me and Hyundai which has not or will not try to correct this safety hazard. Last incident this occurred on 3/11/2023 for at least the 6th time. This has happened with vehicles behind me which have come close to hitting me.

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.