Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The ECM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
PWR-STR message displays on the driver information center (DIC).
The ECM disables Cruise Control.
The ECM commands the coolant fan ON.
The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
The ECM stores P0502 in ECM history during the second consecutive trip in which the Conditions for Setting the DTC are met.