2005 Chevrolet Malibu Maxx won't shift with +/- button

can’t manually shift when using the +/- button on shifter and in the “L” selection. Any ideas ?

Does it shift fine otherwise, ie, not in the manual mode?

how many miles on this, and have you ever had the transmission serviced (fluid change) ?

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The button is just that, a button. One that moves with the shifter. They wear out or the wires get damaged. I’d suggest the button needs to be replaced or there is a broken wire. Either way, you need to open up the shifter to test or find the problem.

Leave it in drive then try the buttons.