The automobile dictionary meaning of the engine U1240 Code is found online and you must not allow that meaning for solving the car engine. An expert automobile engineer does not allow the false meaning for solving the car engine. The automobile dictionary meaning of the code is not supporting and the automobile dictionary meaning of the code is U for OBD-II Diagnostic Powertrain (U) Trouble Code For Engine. 1 for Intake Valve Control Solenoid Circuit Low. 2 for Engine Oil Temperature Sensor Malfunction. 4 for Cylinder 10 Contribution/balance Fault and 0 for Reverse Input Circuit. Finally test the car to know the car engine is ok or not.