Chrysler Grand Voyager all gear selection boxes light up, no selection. select gear stick three down, but gears don’t change on run, remain in low gear.

All gear selection boxes have squares around them, making it impossible to select a gear. Can manually pull gear shift three down to select drive, but gears won’t change, it stays in low gear. The problem is intermittent, usually occurring when driven and switched off, as like when stopping to re fuel.
So usually when engine has warmed.