code comes up p0730 honda civic ex 2001

Question

2001 Honda civic ex I scanned it and code came up p0730.  I bought the part its a solenoid I replaced it and car is still doing same problem which is..  I start the car first time that day and put it in drive and it goes about 3 miles or 10 mins of driving the trans starts to slip I lose the gear and it just revs up in all gears I shut the car off about 3 mins start it back up and it will work and drives another 5 mins it slips again. trans fluid is full somebody please help me please

Answer 1

This is a indication of loosing transmission fluid pressure. This is more of  mechanical condition with its pump, The transmission is on its last leg, you can try a transmission additive , Other than that a rebuild or another transmission