Mercedes-Benz will be contacting the owners of certain 2016-2017 Mercedes Benz S63 AMG, S65 AMG and S550 coupe/convertible vehicles because the seat belt extender may not retract as intended. According to the defect report, the control unit for a specific production range was not properly coded to account for friction conditions during activation of the extender. In the event of a crash, the extended seat belt extender could break, minimizing the full protection of the seat belt and may create edges that could inflict additional injuries.

MBUSA will notify owners, and dealers will update the control unit software. The recall is expected to begin in mid-December 2016. Owners wanting more information about the problem are asked to contact MBUSA customer service at 1-800-367-6372. The NHTSA campaign number for this recall is 16V-829.