hi my name is XXXXX XXXXX I`ll be happy to assist you. there is a few things that could be. one of them is that the torque converter could be slipping and causing it to go in fail safe witch is the O/D light to flash and no overdrive, another problem could be that there is clutches burned up inside the transmission or a bad solenoid.eather way I would have it diagnosed at a transmission shop before problem gets any bigger and much more expensive.
I hope this helps you and if you have any more questions let me know.
for that we need to know first what transmission code you have stored. usually when there is a component in the transmission slipping such as the torque converter it takes two consecutive drive cycle for the computer to set the code and to set it on fail safe. a lot of times this gets confused with temperature related. problem and throws the diagnostics off. transmission problems like the one you are experiencing are very tricky to address correctly without throwing parts at it. my recommendation will be to have a transmission shop take a look at it. they have special tools that can speed up the process and make it lees expensive.
I wish there was an easy way to address this concern but this will be the best way to find out for sure.
hope this helps you and if you have any more questions let me know.
how many miles there is on this vehicle and what is the condition of the fluid? does it smell like paper burned?
overfilling the trans does not cause any problem like the one you are having.
ok. so once is hot it doesn`t matter if you drive it then?. is just as soon as you move the shifter to any gear the light starts flashing?
I`m sorry about the time inconveniente. I`m trying to be online as much as posible but if for you is better that I opt out so someone closer to you is able to assyst you I`ll be glad to do that for you. botXXXXX XXXXXne I`m here to do what iserves you best.