Scania fault code 520

Code 520 is used by 17 different Scania systems. Choose the control unit shown in your diagnostic tool:

EMS Engine Management System Injector cyl. 8 cable/injector open load The engine control unit has detected an abnormal voltage, indicating a break in the circuit. Read explanation → TMS Transmission Management System Switch for manual or automatic gear shifting, CAN message fault The control unit indicates a signalling fault in the gear lever switch for selecting between manual or automatic gearshift. Read explanation → BMU Battery Management Unit CAN communication for TMS SUB CAN missing Communication error. TMS SUB CAN has an open circuit. The fault is detected if the control unit tries to send CAN messages on TMS SUB CAN and does not receive any acknowledgement f… Read explanation → EMD Cylinder 8 Open circuit detected in the injector solenoid valve or in the electrical cables to the injector. Read explanation → EME Cylinder 8 Open circuit detected in the injector solenoid valve or in the electrical cables to the injector. Read explanation → EMO Injector cyl. 8 cable/injector open load Permanent open circuit detected on the injector coil(s) or the cabling to the injector(s). Faults detected only when engine is running. Read explanation → VDT Output signal Short circuit to ground on output for control unit E754. Read explanation → COO Coordinator Fuel level The voltage in the fuel level sensor circuit has been above the permitted level. Read explanation → MBS CAN bus (external), no communication The MBS control unit fails to detect communication on the CAN bus within the set time period. Read explanation → CUV Visibility system CAN communication Communication error. The yellow CAN bus has an open circuit. Read explanation → BCI Communication fault, CAN bus for expansion units Open circuit in cable harness to the CAN bus for expansion units. Read explanation → LAS Locking and Alarm System Motion sensor in bodywork The bodywork motion sensor has no communication with control unit pin C4. Read explanation → CMS CAN communication Communication error or overload on the orange CAN bus. Read explanation → ALM Micro switch rear door driver's side (truck)/micro switch A3 (bus), open circuit Open circuit in the micro switch. Read explanation → ACS Articulation Control System Orange CAN bus Communication fault in the orange CAN bus. Read explanation → TCC TCC control unit, external CAN bus missing The TCC control unit has not received CAN notification on an external CAN bus for a certain amount of time. Read explanation → ACSX Orange CAN bus Communication fault in the orange CAN bus. Read explanation →