Detroit-based General Motors (GM) has announced that it is making six more recalls involving 717,949 vehicles. This means that it has now recalled almost 29m vehicles this year.
The recall is expected to cost the car manufacturer $1.2bn (£700m) in repairs.
Most of the recalls have been because of faulty ignition switches, but GM has confirmed a range of issues, including loose bolts and potentially incomplete welding on some seat hooks.
This high number of recalls follows a trend started last year, when automakers recalled 22m GM vehicles.
Amid criticism that it has been reacting slowly to the issue, GM has said that it is “enhancing” its approach to safety.
In a statement released by the company, Jeff Boyer, vice president global vehicle safety at GM, said "We are bringing greater rigor and discipline to our analysis and decision making. If we identify an issue - large or small - that might affect the safety of our customers, we will act decisively."