Crazy trans trouble, any ideas?

[TFaucette]

I have a fully built transmission in my 06 with the exception of billet intermediate and output shafts. i get trans back in truck and it drives and shifts great, Wednesday afternoon drove it around cut it off with out any problems or a care in the world, a couple hours later i get back in to drive it home and pulled out onto the road and truck wouldnt shift out of first gear so i park it and next day i come back to it and pull codes. had three trans codes P0868, p0720, and p01749. Makes me think it may be something electrical so i clear codes check connections on transmission and go for a drive, well same thing wont go into 2nd gear. No codes have come back and i dont have scanner to see what it is doing or commanding but any ideas?

 

[cerberusiam]

P0720-OUTPUT SPEED SENSOR ERROR, P1749 TRANSMISSION THROTTLE VALVE POSITION SENSOR CIRCUIT LOW, P0868-GOVERNOR PRESSURE SENSOR VOLTS TOO HI (DIESEL)

Check your harness to make sure it hasn't been pinched anywhere, that the lugs are seated tightly, no fluid in the round trans control plug. If that doesn't work replace the gov pressure transducer.

 

[John Jar]

P0720-OUTPUT SPEED SENSOR ERROR, P1749 TRANSMISSION THROTTLE VALVE POSITION SENSOR CIRCUIT LOW, P0868-GOVERNOR PRESSURE SENSOR VOLTS TOO HI (DIESEL)

Check your harness to make sure it hasn't been pinched anywhere, that the lugs are seated tightly, no fluid in the round trans control plug. If that doesn't work replace the gov pressure transducer.

I have a fully built transmission in my 06 with the exception of billet intermediate and output shafts. i get trans back in truck and it drives and shifts great, Wednesday afternoon drove it around cut it off with out any problems or a care in the world, a couple hours later i get back in to drive it home and pulled out onto the road and truck wouldnt shift out of first gear so i park it and next day i come back to it and pull codes. had three trans codes P0868, p0720, and p01749. Makes me think it may be something electrical so i clear codes check connections on transmission and go for a drive, well same thing wont go into 2nd gear. No codes have come back and i dont have scanner to see what it is doing or commanding but any ideas?

What was the fix that you had found that worked for this?