Action Taken When the DTC Sets

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The PCM will illuminate the malfunction indicator Lamp (MIL) during the first trip in which the diagnostic test has been run and failed.
The PCM will signal the IPC to turn ON the Service Engine Soon indicator.
The PCM will alternately disable two groups of four cylinders by turning OFF the fuel injectors.
The PCM will store conditions which were present when the DTC set as Freeze Frame and File Records data.