Similar problem on todays forum. My STS will not shift into 3-4. I changed the fluid and filters and there are no fault codes showing 3-4 solenoid failure. Can the solenoids go bad without throwing a fault code or could it be something else. There was no abnormal trash in the pan and there are no noises but it just floats after shifting into second. It will run up fine but will not shift into 3rd.