The recall covers trucks from the 2004 through 2006 model years in the US and Canada.

It comes just days after the government announced that a South Carolina man was killed when an inflator exploded in December. Joel Knight, 52, of Kershaw died when he was struck in the neck by metal shrapnel after his 2006 Ranger hit a cow in the road and struck a fence.

The government says automakers will recall another 5 million vehicles equipped with faulty inflators made by Takata Corp of Japan. Some of the recalls are because of the crash that killed Knight, with the rest due to air bags failing in lab tests.

Other automakers are expected to announce more recalls soon as the Takata inflator mess continues to grow. It now covers 14 auto and truck makers and totals about 24 million vehicles. The National Highway Traffic Safety Administration says the number of recalls is likely to expand further.

Takata uses the chemical ammonium nitrate to cause a small explosion that creates gas and inflates air bags in a crash. But the chemical can deteriorate over time when exposed to high heat and humidity and burn too fast, blowing apart a metal canister designed to contain the explosion.