Two problems related to adaptive cruise control have been reported for the 2021 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2021 Hyundai Sonata based on all problems reported for the 2021 Sonata.
Massive loss of coolant in closed loop cooling system heat soak. Fail safe mode.
Unknown.
| Warnings problems | |
| Automatic Emergency Braking problems | |
| Adaptive Cruise Control problems | |
| Forward Collision Avoidance problems |