For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC C0561 71: System Disabled Information Stored

### Circuit/System Description

The electronic brake control module (EBCM) disables the traction control when other electronic control modules set DTCs for components that affect the operation of the traction control system (TCS).

### Conditions for Running the DTC

• | The ignition is ON.

• | Ignition voltage is greater than 8 volts.

### Conditions for Setting the DTC

The engine control module (ECM) or body control module (BCM) diagnoses a condition preventing the engine control portion of the traction control function and sends a high speed GMLAN serial data message to the EBCM indicating that torque reduction is not allowed. The ECM or BCM will typically set a DTC and the EBCM will set DTC C0561.

### Action Taken When the DTC Sets

• | The EBCM disables the TCS while the DTC is current.

• | The vehicle dynamics caution (VDC) indicator turns ON.

• | The antilock brake system (ABS) remains functional.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present.

• | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

### Diagnostic Aids

This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/TCS.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

ABS Description and Operation

#### Electrical Information Reference

• | Testing for Intermittent Conditions and Poor Connections

• | Circuit Testing

#### Scan Tool Reference

Control Module References