2007 IMPALA SS not shutting off

My friend has a 2007 impala ss with the 5.3 the car won't shut off when ignition is turned to off position and the instrument cluster lights up like normal but the rpms speedometer fuel gauge are all non responsive the obd port isnt getting power either. Has any one experienced that issue or know were to begin troubleshooting it? Thanks

Ignition switch failing?

Seconded, Blue.

Thanks for feed back going to relay suggestions!!