Possible Causes

Possible causes are:

• Damaged DPFEGR sensor.
• Damaged EGRVR solenoid.
• Damaged PCM.
• EGR valve stuck open.
• EGRVR circuit shorted to ground.
• Improper vacuum hose connection.
• Plugged EGR tube.
• Plugged EGRVR vent.
• Plugged vacuum hoses.
• Slow responding DPFEGR sensor.