P0724

DTC P0724
Circuit Description
The body control module (BCM) receives a signal from the brake pedal position (BPP) sensor through the brake pedal position switch signal circuit. The BCM then applies a signal through the stop lamp switch signal circuit to the transmission control module (TCM) and engine control module (ECM).

When the TCM detects voltage on the stop lamp switch signal circuit during acceleration then DTC P0724 sets. DTC P0724 is a type C DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0724 Brake Switch Circuit High Voltage

Conditions for Running the DTC
^ No vehicle speed sensor (VSS) DTC's P0722 or P0723.
^ No brake switch DTC P0719.
^ The vehicle speed is 8 - 40 km/h (5 - 25 mph) for 6 seconds, then greater than 40 km/h (25 mph) for 7 seconds.

Conditions for Setting the DTC
The TCM detects voltage on the stop lamp switch signal circuit during acceleration.

Action Taken When the DTC Sets
^ The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL).
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM records this information as a Failure Record.
^ The TCM stores DTC P0724 in TCM history.

Conditions for Clearing the DTC
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
^ A scan tool can clear the DTC.

Diagnostic Aids

Important:
^ Verify that the BPP sensor is adjusted properly. Refer to Brake Pedal Position Sensor Calibration in Lighting Systems.
^ Test drive the vehicle if a switch or circuit condition cannot be located. An intermittent condition may be duplicated during a test drive.
^ Application of the brake pedal while accelerating may cause this DTC to set.

Test Description
The number below refers to the step number on the diagnostic table.
2. This step determines if the fault is present.