P0344 and p0016 codes

Question

I changed both sensors Engine light is still on.
I get the codes cleared and truck runs mint for a few mins then the engine light comes back on .put the computer back on it and the same codes pop up .  Vehicle starts and runs fine but when i hit hiway speeds of 75 mph it wont shift into o/d
.   what might be causing this?

Answer 1

The cause for this is the variable timing solenoid, The required solution  is to replace the the OCV solenoid