TM 10-3930-675-10 0020 00-6 ERROR CODES - CONTINUED 0020 00 Table 4. Error Codes - Continued. ERROR CODE DISPLAY LAYOUT DRIVER ACTION ERROR CODE CATEGORY/ EXPLANATION VEHICLE LIMITATIONS 120 Stop Vehicle Press RESET. Finish mission. Notify maintenance. Warning - Degraded Operation No pressure - brake circuit 2 Hydraulic failure. Only half brake capability available. 121 Stop Vehicle Put load down safely. Abort mission. Notify maintenance. Stop Vehicle Immediately Supply voltage - ECU 790 Emergency stop engaged. Circuit breaker tripped. Cable defective. Operating system and boom function not working. 122 Stop Vehicle Put load down safely. Abort mission. Notify maintenance. Stop Vehicle Immediately Supply voltage - CAN 790 Circuit breaker tripped. Cable defective. Operating system and boom function not working. 123 Stop Vehicle Put load down safely. Abort mission. Notify maintenance. Stop Vehicle Immediately Ref. voltages 10V- ECU 790 Circuit breaker tripped. Cable defective. Operating system and boom function not working. 125 Stop Vehicle Shut engine off/on. If code clears, resume mission. If code remains, notify maintenance. Stop Vehicle Immediately Memory fault, check ECU 790 Circuit breaker tripped. Cable defective. None if code clears. Operating system and boom function not working. 126 Stop Vehicle Put load down safely. Abort mission. Notify maintenance. Stop Vehicle Immediately Signal  for  lifting/lowering,  out of range Cable defective. Short circuit. Potentiometer in joystick not functioning. Lift/lower does not function properly (hydraulic stops).