Up to 393,000 2006-2008 Hyundai Sonata models are being investigated by the National Highway Traffic Safety Administration for failure of the rear suspension control arms. Six complaints about the issue have been received by the agency so far. Three of the incidents were reported to have happened at highway speeds, and two claiming the electronic stability control system was triggered as a result.
Whether the stability control system activation was just the system doing its job, or a fault triggered by the failure of the rear control arm is unknown. Hyundai says it is fully cooperating with NHTSA, but says that no specific safety-related defect has been identified. The complaints filed with NHTSA also do not identify the states or areas where the affected vehicles came from, suggesting that the issue may be limited to areas that use road salt, or other corrosive or abrasive road treatment materials in winter weather. Four of the complaints are with Korean-built Sonatas, identifiable by the "K" at the beginning of the vehicle identification number. At least one of the vehicles was built in Alabama.
NHTSA safety investigations do not always necessarily result in a full-fledged recall. The 2006-2008 Sonata has been previously recalled for faulty passenger airbag seat sensors, and incorrectly-aimed headlights, among other issues.
Source: NHTSA, Detroit News