The German manufacturer reports that in the event of a main battery failure, the electric ignition lock will not be supplied power from the backup battery.
As a result, if the vehicle’s engine stops during use - for example in traffic using the car’s idle stop-start system - the electric parking brake and the transmission’s “P” position cannot be engaged.
If this defect occurs, the vehicle cannot be restarted. Furthermore, stopping the vehicle from rolling would only be possible by operating the brake pedal, posing a significant hazard to the driver and other road users.
Affected SLK vehicles were sold from the 4th of February 2015 to the 28th of September 2015.