On the Mazda3 (and all other Mazda vehicles, for that matter), the AT light stands for "automatic transaxle". Seeing it illuminate can be for trivial reasons, but it can also indicate something much more serious. If it lights up, You should stop driving Your vehicle as soon as safely possible, and begin to diagnose the issue. The most common reason that the light will illuminate is because Your Mazda3 is running low on automatic transmission fluid. Therefore, this should be the first thing You should check. If this isn't Your issue, I'd recommend running an OBD-II scan tool on the vehicle, since the light is usually accompanied by at least one fault code. Hopefully, it's something simple and not too serious!
Jessica Shkjau
November 13, 2020
I also have AT light on what can I do ?
Esther W.
April 9, 2020
The at light in a mazda3 is associated with the automatic transaxle. It may come on if your automatic transmission fluid is low, but it can also be warning of a serious issue that needs immediate attention.
llpyd avery
June 30, 2020
At light is on
Daniel
September 9, 2020
Why is at lite on in my 2013 Mazda3
Tabitha
October 9, 2022
My AT light is on ?
Carl
April 8, 2023
If your AT light is on it's most likely the TCM A.K.A transmission control module on a mazda 3
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