Hi, thanks for your question in the community.
This error code means: C249F working life of the device check A7/3 (SBC hydraulic unit)
With the vehicle you have to contract partners to a Daimler, this can perform internal audits on the control unit on the basis of the error codes on the StarDiagnose. Then you can tell you exactly when there is only a software update, or whether the SBC unit must be replaced. It suggests but a defect of the device and I'm assuming that the SBC unit will be renewed.