Just days after announcing a civil penalty against Ford for recalling vehicles too slowly, the U.S. government has unveiled two investigations into recalls that may not have worked or covered enough vehicles, the Associated Press writes.

The largest covers about 457,000 Ford Bronco sport utility vehicles (SUVs) and small Maverick pickup trucks. In April, Ford recalled some model years 2021-2024 BroncoSports and 2022-2023 Mavericks because they can suddenly lose power.

There have been five complaints from owners whose vehicles lost power after receiving the recall decision, according to a National Highway Traffic Safety Administration (NHTSA) document released Monday.

The agency will investigate whether the recall was effective. The power outage was caused by dead 12-volt batteries.

The other study covers about 113,000 Ford Expedition models from 2019 through 2020. In February, Ford recalled about 78,000 SUVs because the driver and front passenger seat belts can buckle and restrain people without apparent crash effects.

The agency says it has complaints about the problem from three owners whose vehicles were not recalled. Investigators will look into whether the recall should be expanded. Ford has said it is cooperating in both investigations.

NHTSA announced Thursday that Ford Motor Company will pay a fine of up to $165 million for conducting the recall too slowly and failing to provide the agency with accurate recall information.