DTC P0400: General Description

Courtesy of HONDA, U.S.A., INC.

The exhaust gas recirculation (EGR) system failure conditions include a sticking lift sensor, restricted passages, or leakage from the external piping. At any specific EGR lift value there is a corresponding air fuel ratio compensation value. If the air fuel ratio compensation value is greater than the corresponding EGR lift value, the powertrain control module (PCM) detects a malfunction and stores a DTC.