No communication to the gearbox ECU Common fault codes: P0751 17135 – Shift Solenoid 1 (N88) Short To Ground P0756 17140 – Shift Solenoid 2 (N89) Short To Ground P0761 17145 - Shift Solenoid 3 (N90) Short To Ground P0766 17150 - Shift Solenoid 4 (N91) Short To Ground ...