What is check engine code p1547?

That is a proprietary code and is different in some vehicles but on GM/ Dodge vehicles it would be P1547 A/C System Performance Degraded ... For VW it is P1547, Wastegate Bypass Regulator Valve Short To Ground For Subaru it is P1547, Exhaust Gas Temperature Sensor Malfunction .. For Audi it is P1547 Boost Pressure Control Valve Short To Ground