The engine P1715 code on automobiles with electronically maintained automatic transmissions, the 3-4 shift solenoid is accountable for activating the hydraulic circuits to trigger clutches or bands that change gears inside the automatic show. The leak uncovering pump is portion of the evaporative releases system. This method tests the fuel process to confirm it is not leaking fuel gases into the air. The system pulls a vacuum on the fuel method and holds it for a dated of time. Do not drive the car with the car engine problem and fix the car engine as soon as possible. You must rely on a trusted automobile engineer.