P0575

DTC P0575

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0575 00
- Cruise Control Switch Signal Circuit

Circuit/System Description

When a cruise control function switch is activated, the body control module (BCM) detects a predetermined voltage signal. The BCM sends a GMLAN serial data message to the engine control module (ECM) indicating the function that has been requested.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

* The ECM receives an invalid cruise control switch status GMLAN serial data message from the BCM.
* This diagnostic runs continuously.

Action Taken When the DTC Sets

* The Cruise Control System is disabled.
* The ECM stores the DTC information into memory when the diagnostic runs and fails.
* The malfunction indicator lamp (MIL) will not illuminate.
* The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.
* All cruise control function switches are set to OFF.

Conditions for Clearing the DTC

* The DTC becomes history when the conditions for setting the DTC are no longer present.
* The history DTC clears after 40 consecutive warm-up cycles.
* The ECM receives a clear code command from the scan tool.

Diagnostic Aids

* This DTC may be stored as a history DTC without affecting the operation of the BCM. If stored only as a history DTC and not retrieved as a current DTC, do not replace the BCM or ECM.
* Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Circuit/System Verification

Important: Verify that B3794 is not set as current or history before performing this diagnostic. If B3794 is set as current or history, go to DTC B3794. B3794

1. Engine ON, observe the scan tool Cruise Control Switch parameter in the BCM while pressing the cruise control switch ON and OFF. The reading should change between ON and OFF.

• If the parameter does not switch between ON and OFF, replace the BCM.

2. Engine ON, test drive the vehicle and attempt to engage cruise. Verify that cruise control engages properly and that DTC P0575 is only set as a history code.

• If cruise control does not engage and the DTC P0575 sets as current, replace the ECM.

3. If the cruise control system tests normal, clear all codes. The vehicle is OK, do not replace the ECM or BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests