At a glance
What can fail
Wiring connecting the steering column clockspring to the driver's airbag may fracture from movement between the clockspring and steering wheel hub. This can cause the dual-stage airbag to deploy only partially or not at all during a crash.
What the fix does
Dealers will install alignment spacers in specific steering column areas to prevent the relative motion causing wire fracture.
Summarized — see the official notice for exact wording, dates, and contacts.