DTC : P0400 (2021): General Description

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

The exhaust gas recirculation (EGR) system failure conditions include a sticking lift sensor, restricted passages, and 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.