i have a 2002 C230 Mercedes Coupe Kompressor, it is showing these error codes: 4300 (CAN communication is faulty). 4310 (CAN communication with traction system is faulty). 4311(CAN communication with engine is faulty). 4312 (CAN with the engine is faulty or engine temp. is unplausable). 4600(the voltage supply of Circuit 87 has under voltgage). Car runs smooth but won't shift. what could be causing all these CAN errors?