What mean P1774

This code will set if there is an electrical circuit malfunction for the low coast brake solenoid valve or if the TCM detects a relationship problem between the gear position and the reading of ATF pressure switch 2. There is a TSB (NTB10-003A) for this and other A/T codes. Everything is built inside of the transmission on this vehicle - the Transmission Control Module (TCM), and all the solenoids and the pressure switches, etc. Often times when there is an internal electrical issue with the transmission, it is caused by engine coolant getting in to the automatic transmission fluid due to a bad transmission cooler in the radiator.