P0573

DTC P0573

Circuit Description


The body control module (BCM) receives a signal from the brake pedal position sensor through the brake pedal sensor signal circuit. The BCM then applies voltage through the stop lamp switch signal circuit to the transmission control module (TCM) and engine control module (ECM).

Conditions for Running the DTC

^ Vehicle has cycled from 0-60 km/h (0-37 mph) 3 times in 1 ignition cycle.
^ Continuous once the previous criteria have been met.

Conditions for Setting the DTC

The TCM detects an open or short to ground on the stop lamp switch signal circuit when the voltage should be present.

Action Taken When the DTC Sets

^ The TCM stores the DTC information into memory when the diagnostic runs and fails.
^ The malfunction indicator lamp (MIL) will not illuminate.
^ The TCM records the operating conditions at the time the diagnostic fails. The TCM stores this information in the Failure Records.

Conditions for Clearing the DTC

^ A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
^ A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Use a scan tool in order to clear the DTC.

Diagnostic Aids

Important:

^ Verify that the brake pedal position sensor switch is adjusted properly. Refer to Brake Pedal Position Sensor Calibration.
^ Test drive the vehicle if a switch or circuit condition cannot be located. An intermittent condition may be duplicated during a test drive.
^ For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The number below refers to the step number on the diagnostic table.

2. This step determines if the fault is present.