According to the details the automaker released, the US National Highway Traffic Safety Administration began looking into its vehicles after hearing of a lawsuit wherein the air bags of one of its trucks failed to deploy in the midst of a rollover crash. Upon conducting its own investigation, Chrysler found that some of its models might generate an erroneous code when it rolls over after suffering a significant underbody impact, such as hitting large pieces of debris. That code could temporarily disable the side air bag and the mechanism that locks the seat belt in place, putting people's lives in danger.
The company says owners can reset the seatbelt system if the warning sign lights up by turning the vehicle on and off. However, it encourages everyone to follow the instructions on the retail notices they're sending out to be absolutely safe. Back in 2015, Fiat Chrysler also had to recall 1.4 million vehicles after it was revealed that people could hack into some of its models' systems to kill the engine and disable the brakes. It's far from the only automaker that's had to issue a recall over software issues, though. General Motors had to take back 4.3 million vehicles last year because of a software defect in its airbag system, while Toyota recalled 1.9 million Prius hybrids in 2014 due to a glitch that causes overheating.