My wifes 2011 Grand Caravan has had no issues until the other day it just decided to jerk and then lock into limp home. Before it did that we were in line for 30min to get into a basketball game. After we left it did this. I drove it home at 35mph. Checked the oil and it doesn't smell burnt and is still reddish pink and can see through the oil. I had a friend come over and check the codes. There is P0734 and P1790. When we monitored them it would say it wanted to go into 4th then it would slip and lock into 3rd. The hydraulic pressure said it was targeted at 930psi. When it tried shifting into 4th it would drop under 500psi. When looking into the problem it says the 2 and 4 clutch is the same. What is activated to go into 4th that isn't active for 1-3? Also could any of the valves be bad? The van only has 92k miles on it. Seems low for a major issue.