The existing recalls involve the the closely related 2012 Buick Verano (shown) and Chevrolet Cruze sedans, along with Sonic and Camaro models. The root of the problem is a shorting bar in the inflator module of the steering-wheel-mounted airbag that may contact the primary state airbag terminal, a condition that could prevent deployment in an accident. Dealer technicians have been replacing the steering wheel airbag coils to fix the issue.
According to a post on NHTSA's website, the root cause, said to be a production issue, may not have been completely isolated – particularly for the second recall, which was for the Camaro. According to Automotive News, GM says it is cooperating with the government investigation, but won't say whether or not it knows the true origin of the problem.