A detached rear control arm, says NHTSA, “may suddenly change the rear wheel alignment, affecting the handling of the vehicle, increasing the risk of a crash.
LOL, love the legalese. Just like an inadvertent air bag deployment on the Vibe/Matrix "may startle the driver" or whatever it was they said.
I like Hyundai but geez... They've been battling undercarriage corrosion for years and still haven't figured it out. The prior generation Sonata and Santa Fe were also recalled for some pretty nasty subframe rot up front. Brake light switches and cancer of the subframes, two things Hyundai can't seem to get under control.