Just replaced tranny with a fresh rebuilt tranny everything works fine except the overdrive. The button on the dash stays lit all the time when the truck is running, I've pushed the button several times but no luck it still stays lit. I need some help figuring out what causes this problem sometimes when it sits for a while it will be off then when I drive it will turn back on. Any information will help thanks.

 

What year is the donor trans?

 

It's out of a 97 .

 

Getting a CEL?

Wonder if it has a bad sensor in it.....

 

Is the sensor internal or external ?

 

Internal. Can't be that easy.

Know anyone with a scan tool? Have a look at what the PCM thinks the trans temp is, and if someone is pushing the button for O/D off. Might be just a bad wire somewhere too.....

PCM will disable O/D if it sees trans temp too high, or, the button being pushed. If the O/D Off lite comes on right away, and stays on.... gotta be one of those two issues.

 

I just sat for about 2 hrs started it up the light was off drove about a quarter mile light is back on I will check it with a scan tool thanks

 

Who rebuilt the tranny? you or a shop?

 

An individual who has been doing it for 25 years.

 

Call him and tell him what it is doing and see when you can take it back. I would not attempt anything before doing that.....other than checking fluid level in neutral.