Scania fault code 2603
Code 2603 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
TMS Transmission Management System
Planetary gear's coupling sleeve
Despite repeated gear-changing attempts, the sensor for the planetary gear coupling sleeve does not verify that it has reached low range.
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BMU Battery Management Unit
No CAN message from BMU control unit M
BMU control unit A is missing CAN message from secondary BMU control unit M.
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PCS
Coupling sleeve L2, connection failed
Coupling sleeve movement from disengaged to engaged position cannot be completed.
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