Question

codes p1730 p1731 p1774 help understanding the codes?

Answer 1

P1730 A/T interlock

P1731 A/T 1st engine braking

P1774 Low coast solenoid valve funtion

P1730 set when the transmission control module (TCM) does not recieve proper voltage from the input clutch , the direct clutch ,or the low coast pressure shift solenoids. When P1730 occurs the vehicle goes into a fail safe where you may just have 2nd gear or 4th gear, P1730 occurs when the TCM detects engine braking in any gear other than 1st gear.P1774 sets when the TCM see the actual gear ratio is not correct, For these code to occur the TCM  inside the transmission is faulty  with faulty  shift solenoids and the pressure switch.