Two separate campaigns affect newer Sonata, Genesis, Santa Fe and Santa Fe Sport vehicles.
Hyundai has issued two separate recalls for nearly 600,000 vehicles sold in the US market.
A defective cable for the secondary hood latch in the Santa Fe and Santa Fe Sport was used in 437,400 US-market vehicles from the 2013-2017 model years. If the cable corrodes it can bind, preventing the secondary latch from serving as a redundant backup.
"If the hood is not securely closed or the primary latch is inadvertently released and the secondary latch is not engaged, the hood could unexpectedly open while driving, increasing the risk of a vehicle crash," the recall documents warn.
Approximately 161,000 Sonata and Genesis vehicles from the 2015-2016 model years are affected by a different problem involving the parking brake warning light switch. In some cases, the instrument cluster warning light does not illuminate when the brake is engaged due to corrosion in the switch.
"f the parking brake indicator is not illuminated when the parking brake is applied, the driver may operate the vehicle with the parking brake partially engaged, affecting the brake performance and increasing the risk of a crash," the NHTSA says.
Repairs for both campaigns are expected to begin at the end of the month.