Conditions For Running DTC

WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. 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.