Conditions For Running DTC

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The ignition voltage is more than 11.7 volts.
The commanded EGR position is more than 0 percent.
The EGR flow test is not active.
The Desired EGR does not change more than 20 percent.