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.

Engine speed is more than 500 RPM for 5 seconds and not in fuel shutoff.
Transmission is not in PARK or NEUTRAL.
Time since last range change is more than 6 seconds.
No output shaft speed rise greater than 250 RPM in 2 seconds.
DTCs P0502 and P1810 are not set.