Overdrive shifter switch is not working all the time

[Steves fourth gen 2]

Hi I have a 2010 adrenaline with 4.6 Awd and the overdrive button on the console shifter works intermittently. Anyone else have this issue and what would I check?
Thanks, Steve

 

[Todd Z]

Either the button is bad, the module mounted in the white box under the shifter is bad OR more common is people spill drinks, cleaners and what not drips under the trim and corrodes the contacts on the shifter module under the console....