My O/D (Overdrive) light came on blinking recently out of no reason. I checked to turn off the button and yes, it doesn't go in fourth gear, and when i turn it on, it does go to fourth gear. Therefore, technically there isn't any mechanical failure to the trans but why the light keep blinking on the gauge cluster?? Can anyone please help? I got into a front end collision before but right after the accident, the light didn't come on til the next 300 driven miles. And now i got everything fixed, the light still there blinking. Please help...Thank you..