The overdrive light on is indicating an electronic component fault inside the transmission, there will be a code set in the processor, need to have the code retrieved to trouble shoot the problem, the transmission could have major problems but until there is a diagnosis, it could be as easy as a shift solenoid, or as major as a trans overhaul or replacement. hope this helps.
__________________
If you like what I had to say. please click Accept, and always leave a FEEDBACK so I can see how I'm doing. THANK YOU.

