Mercedes Active Brake Assist Problem

Daimler, the manufacturer of Mercedes Benz will be contacting the owners of certain 2019-20210 GLE Class, C Class, E Class, S Class, GLC Class and CLS Class vehicles equipped with a driver assistance package, because of a problem affecting the forward collision avoidance system.

According to the defect report, coding of the radar sensor control unit may not meet current production specifications. This could result in an impaired signal matching of the radar sensor, causing the autonomous partial or full braking to not function as intended. The vehicle's active brake assist feature for reducing or avoiding collisions would be diminished, increasing the risk of an accident. Drivers will not receive an advance warning due to the nature of the failure mechanism, but the driver will still be alerted by an optical and acoustic waning of the Active Brake Assist.

MBUSA will notify owners, and dealers will update the radar sensor control unit software. The recall is expected to begin September 17, 2019. Owners may contact MBUSA customer service for more information about the problem.

Below is a list of the vehicles affected.

2019 Vehicles

C300 Cabrio, C300A Cabrio 4Matic, C300 Coupe, C300 Coupe 4Matic, C300, C300 4Matic, C43 AMG Cabrio 4Matic, C43 AMG Coupe 4Matic, C43 AMG 4Matic, C63 AMG Cabrio, C63S AMG Cabrio, C63 AMG Coupe, C63S AMG Coupe, C63 AMG, C63S AMG, CLS450, CLS450 4Matic, CLS53 AMG 4Matic, E300, E300 4Matic, E450 Cabrio, E450 Cabrio 4Matic, E450 Coupe, E450 Coupe 4Matic, E450 Wagon 4Matic, E450 4Matic, E53 AMG Cabrio 4Matic, E53 AMG Coupe 4Matic, E53 AMG 4Matic, E63S AMG 4Matic, E63S AMG Wagon 4Matic, S450, S450 4Matic, S560 Cabrio, S560 Coupe 4Matic, S560, S560 4Matic, S560 4Matic Maybach, S63 AMG Cabrio 4Matic, S63 AMG Coupe 4Matic, S63 AMG 4Matic, S65 AMG Cabrio, S65 AMG, And AMG GT53 Coupe 4Matic

2020 Vehicles

GLC300 Coupe 4Matic, GLE350 4Matic, and GLE450 4Matic