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Exhaust Gas Recirculation Circuit Range/Performance 

P0404 OBD-II Trouble Code:

In this code, the performance of exhaust gas recirculation (EGR) is noticed to be out of range as detected by the Engine Control Module (ECM).

Possible Causes:

  • Faulty EGR valves
  • Corroded connections
  • Blocked passage of EGR

Possible Symptoms:

  • Check engine light turns on
  • Stalling of engine
  • Pre-ignition of the engine on acceleration

Possible Solutions:

  • Change EGR valve
  • Change the connections
  • Clean EGR passage

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