General Motors may have increased its US sales in August by 10 percent compared to the same month in 2011, but last Wednesday it notified its dealers to stop deliveries of some of its most popular models.

The reason is a software glitch on the OnStar communication system that affects the 2013 Chevrolet Cruze, Equinox and Volt, the Cadillac ATS, SRX and XTS, the Buick Verano plus the GMC Terrain.

GM spokesman Alan Adler said that the issue has been identified as the system failing to alert the OnStar call center in an accident that the vehicle’s airbags are not deployed, like a rear-end collision.

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