Scania fault code 28678

Code 28678 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:

TMS Transmission Management System Retarder oil pressure Engagement of the freewheeling retarder is stopped if retarder oil pressure is too high so as not to damage the synchroniser. Read explanation → RET Retarder Solenoid valve for operating freewheeling retarder There is a short circuit to ground in the solenoid valve. Read explanation →