When i start my car AT flashes what is that?

I think it just means you have an Auto Transmission... I have an automatic and my AT light comes on and then turns off when I start my P5 too.
 
It doesn't flash, it comes on with key then goes off after starting. Flashing is indication of problem, overdrive issue IIRC. Is it regular auto with OD button or is it sport auto slapstick?
 
Also could be nasty oil/strainer. Does it have enough atf in it? Is it slipping or acting normal while driving? Check it out....
 
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