About 2.1 million vehicles have been recalled over an air bag problem, which will affect three major automakers: Toyota, Fiat Chrysler, and Honda.

U.S. federal safety regulators said the companies will recall the older vehicles to fix the defects, which could cause the air bags to deploy when they shouldn’t, according to a Reuters report.

The National Highway Traffic Safety Administration announced that Toyota Motor Corp., Fiat Chrysler Automoboiles NV and Honda Motor Co. were the three companies that would be fixing issues with the air bags. The announcement comes in the wake of 400 reported cases of inadvertent air bag deployments, which have caused minor injures in some cases but no deaths, NHTSA Administrator Mark Rosekind said, according to the report.

Officials believe a defective chip in the air bag system was causing the problem, which would require a replacement of the entire air bag module.

Three recalls had been issued before to fix chip problems, but 39 of those vehicles still experienced an inadvertent air bag deployment, prompting a new recall.

The recall isn’t related to recent concerns about Takata Corp. air bags, which safety regulators say can rupture and spray metal fragments.

General Motors last year delayed recalling millions of vehicles with a defective ignition switch that could cause power to be cut off for safety systems, an air bags were central to that concern, according to the report.

A total of 374,000 Honda and Acura vehicles are affected by the recall. The company downplayed concerns, saying that a “small number” of complains had surfaced after the original repair, and that there had been no crashes as a result of the issue.

Models that were particularly affected included mainly models from the early 2000s, including Jeep models, the Honda Odyssey, the Dodge Viper, Toyota Corolla, among others.