P0400 Exhaust Gas Recirculation (EGR)

Definition of P0400 EGR The basic definition of P0400 EGR code corresponds to Exhaust Gas Recirculation Flow Malfunction. (EGR valve) What the P0400 code means P0400 belongs to OBD-II generic code. It points that the engine control module (ECM) has detected some problem with the exhaust gas. Mostly it means that the engine EGR valve