Here is what my owner's manual says about CD player:

Playing a Compact Disc
Insert a disc partway into the slot, label side up. The
player will pull it in. The disc should begin playing. The
display will show CD and the CD symbol. If you want
to insert a compact disc with the ignition off, first press
RECALL or EJECT.
If you’re driving on a very rough road or if it’s very hot,
the disc may not play and ERR (error) may appear on
the display. Press RECALL to take ERR off the display.
When things get back to normal, the disc should play.
If the disc comes out, it could be one of the following:

The disc is upside down.

It is dirty, scratched or wet.

It is very humid. (If so, wait about an hour
and try again.)