P04D9

2017-10-10

Description:

  • Closed Loop EGR Control At Limit Flow Too Low

Possible Symptoms:

  • Check for any intake manifold or EGR valve blockages and clean if necessary.

  • Inspect the EGR valve for any malfunction or carbon buildup and replace if needed.

  • Verify the integrity of the EGR system's vacuum lines and hoses and replace any damaged components.

  • Check and clean the EGR passages in the intake manifold.

  • Perform an EGR system reset and relearn procedure.

Possible Causes:

  • Malfunctioning EGR valve

  • Clogged or restricted EGR passages

  • Faulty EGR solenoid or sensor

  • Vacuum leak in the EGR system

  • PCM (Powertrain Control Module) software issue

Related Parts:

Possible Solutions:

  • Check engine light illuminated

  • Engine hesitation or stumbling during acceleration

  • Decreased fuel efficiency

  • Rough idle

  • Engine stalling or difficulty starting.

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