Scania fault code 28677

Code 28677 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:

TMS Transmission Management System The synchromesh actuating arm is disengaged when the solenoid valve is activated The solenoid valve for operating the actuating arm is activated and the actuating arm should be engaged, but jumps out of the engaged position. Continuous checks are carried out du… Read explanation → RET Retarder The synchromesh actuating arm is disengaged when the solenoid valve is activated The solenoid valve for operating the actuating arm is activated and the actuating arm should be engaged, but jumps out of the engaged position. Continuous checks are carried out du… Read explanation →