U.S. safety regulators are investigating an problem with side air bags that may fail to inflate in a crash.

The problem already has caused recalls of over 2,700 Toyota, Honda, Subaru and Nissan vehicles, but that number could grow if the National Highway Traffic Safety Administration determines that more automakers used similar defective parts.

The recalled vehicles could have an ineffective mixture of the gas that inflates the side curtain air bags in a crash. That mix could mean air bags on one or both sides of the cars will not inflate in a crash, increasing the risk of injury, the agency said. No reports of anyone being hurt have been made so far.

All four companies with recalled vehicles told NHTSA that the Americas unit of Swedish safety parts maker Autoliv Inc. made the propellant for the side air bags. The investigation was opened Feb. 14. Documents detailing the probe were posted on NHTSA’s website

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