P0400

Severity medium

AUTO

The engine control module detects that the EGR system is not moving the correct amount of exhaust gases back into the intake. The valve, pas

OBD-II scanner plugged into a car diagnostic port showing a trouble code
OBD-II codes: read the code, test the component, clear it and re-check.

What it means

The engine control module detects that the EGR system is not moving the correct amount of exhaust gases back into the intake.

How to fix P0400

  1. Quick visual check
  2. Inspect EGR valve and passages
  3. Test EGR valve operation

Related errors

P0401P0420P0430P0300P0301P0302P0303P0304

Source: open OBD-II DTC database

Last updated: