Overdrive not functioning due to the engine temperature not being found by pcm

[mitch vermillion]

2002 2wd new trans and new pcm . The trans shop said needs a new pcm well there is 900 dollars pcm arrives ,didn't fix the overdrive issue witch is no overdrive unless they make the scan tool pro-form that task . There telling me that there not sure what the issue is besides the engine is not telling the computer that it's warm enough to go into OD.

 

[Wayne M.]

This truck is OBDII. Get a scanner that’s able to read all sensors and look at your temps. My 1 gen wouldn’t get into OD until it hit a certain temp. My ride home from work was from zero to hiway speed upon startup, and on the most frigid days, it would hold 3rd for about a mile and a half, probably until it saw a certain temp, which obviously was pretty low.
Good luck in your diagnosis.