Conditions For Running DTC

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running.
The Ignition 1 Signal voltage parameter is 11-18 volts.
The EGR valve is commanded to zero percent for 20 seconds after the EGR valve has been commanded to open more than 40 percent for 0.5 second.