So usually in the mornings or after my truck sits, it hesitates to get out of first gear..especially on inclines. I was at a stop light the other day (on a slight incline) and i gave it gas and it reved up but wouldnt go anywhere. A transmission fault light came on and the O/D light started flashing. I put it in park and pressed the O/D button and was able to shift into gear and get going. I started the truck up after that and the fault was gone and the yellow wrench light was off. I took it to the dealer and the come back with an OSS sensor.
Now I understand that may have been the code thrown when the truck wouldn't accelerate and reved up, but how would a bad OSS sensor not like the truck go into gear? And for it to clear on its own?

Any suggestions?

 

What year is your truck and which engine and transmission does it have?

 

sorry about that.

It's a 2004 FX4 Auto. 5.4L