2001 MGM LS - Overdrive issue
 

Last month I had to get the fuel pump changed on my beast, he died many times and left me stranded in the middle of the highway several times till we could figure it out. My mechanic finally got me in and swapped out the problem part. But now my car only works if I have Overdrive turned off. It's a problem for me because my heart doctors are almost an hour away and if you drive to long the light flashes and I am worried I'm doing something wrong. I try to be a good owner but this is so confusing to me! Does anyone have any suggestions?

The flashing light indicates a code is stored. Have someone read the codes for you with a scan tool. Most auto parts stores will do this for free.