Conditions for Running the DTC

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running.
The Ignition 1 Signal parameter is more than 11 volts.
The EGR command will be disabled if start-up engine coolant temperature (ECT) is less than 5°C (41°F) and will not enable until the ECT is more than 75°C (167°F).
The EGR flow test is not running.
The EGR valve is commanded to 0 percent for 20 seconds after the EGR valve has been commanded to open more than 40 percent for 0.5 seconds.