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Exhaust Gas Recirculation Circuit Malfunction

P0403 OBD-II Trouble Code:

In this code, open or short circuit is found, and the poor functioning of the Exhaust Gas Recirculation (EGR) is observed by the Engine Control Module (ECM).

Possible Causes:

  • Corroded connections 
  • EGR vacuum control shorted internally
  • Open or short circuit detected 

Possible Symptoms:

  • Check engine light will be illuminated 
  • Pre-ignition of the engine on acceleration 
  • Disabled EGR by ECM 

Possible Solutions:

  • Change the circuit 
  • Change EGR valve
  • Change the connections

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