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I have this 2013 BMW X3 that may have problem with start/stop system. Engine stops when I stop at traffic lights but car goes into park mode when I take my foot off the brake. It sounds car tried to restart but was not successful. Next thing is I get a message of transmission problem. I took it to BMW dealer for diagnosis, I was told that battery is old and needs replacement. I am confused why car is giving transmission error when engine fails to restart and if battery charge is low. Should not give a message saying your battery has low charge. Does SW need to be coded properly with proper parameters, anyone has any idea? Car never hesitates restarting when I push start button.

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