Many customers state that while driving their vehicle, the engine will hesitate, stumble, or lose power. In more severe cases, the EGR valve can be physically damaged. In all cases, the check engine light will be illuminated, and diagnostic trouble codes will be stored in the PCM. 

Diagnosis of the issue has concluded the differential pressure feedback EGR sensor (DPFE) is at fault many times, and incorrectly measures exhaust gas re-circulation (EGR) pressure. 

Correction of the issue requires a diagnostic scan, identification of the faulty sensor, and, ultimately, the sensor and EGR valve may require replacement. In some models, the DPFE sensor is integrated into the EGR valve, and must be replaced together.