The “WS” actually stand for “Wartungs System” (maintenance need analysis). Code 0155 represent the CAN communication timeout with FR control unit. FR is the drive control which is mainly saddled with the duty of communicating accelerator position to the ECU and sending the gearshift reques across to the transmission. The solution in this situation currently is to cleanse the fault codes, with the the Star Diagnosis computer or resetting the system by removing it from the battery terminal for 30 minutes can help. If this does not work, it could be a case of FR unit failure.
The Mercedes-Benz Actros is a functional and reliable truck. But they need proper care and maintenance. This is when Mercedes-Benz Actros troubleshooting can be addressed by a professional in the field.