what does at check means ?

The autimatic transmission has failed in some way or other making it impossible for the computer to tell whether it's in gear or not thus not allowing the engine to turn over. You will need to get your car over to a dealership to have it diagnosed.

I've an altima Nissan 2010. My radio doesn't work. It say check the disk program.

You mean " The Automatic Transmission" right?

Yes

Any fix

What it expensive to fix that AT check? Cause mines is saying the same thing and it’s nerve damage

Correction!!! Is the AT check an easy fix????

Fix it... Yall funny...Try buying a transmission

Ok AT sign just saw it first time 3 years do I buy a transmission or diagnostic