Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

When DTC P0504 is set, the following will occur:

The cruise control is disabled.
The PCM will function as if the brake pedal is not pressed.
The control module stores the DTC information into memory when the diagnostic runs and fails.
The malfunction indicator lamp (MIL) will not illuminate.
The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.