Scania fault code 28929

Code 28929 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:

TMS Transmission Management System The synchromesh actuating arm remains immobile in the engaged position Freewheeling retarder cannot disengage. When the solenoid valve of the operation unit is deactivated, the actuating arm remains in the engaged position. Continuous checks are carri… Read explanation → RET Retarder The synchromesh actuating arm remains immobile in the engaged position Freewheeling retarder cannot disengage. When the solenoid valve of the operation unit is deactivated, the actuating arm remains in the engaged position. Continuous checks are carri… Read explanation →