I am the owner of a 91 525. Today the car left my wife stranded when the car shut down while she was drving it. several attempts were made to restart the car no luck. Afer getting the car home I noticed that the diagnostic system read " Transmission Prog." What is this? I also tried to reset the diagnostic, no luck. I just put in a new battery thinking it might be a battery issue. The old battery was only at 12.6v with the engine running. I have not driven the car with the new battery yet. Im not sure what to think of this, is it transmision problem ? Electrical?
Any info would be much appreciated.