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 Descriptors

DTC C0551: Option Configuration Error

### Circuit/System Description

When the electronic brake control module (EBCM) is replaced, software and calibrations are flash programmed into the EBCM. The EBCM receives the VIN number from the body control module (BCM) in order for the EBCM to automatically calibrate to the vehicle.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

The incorrect EBCM has been installed in the vehicle or the option configuration has not been programmed.

### Action Taken When the DTC Sets

One or more of the following actions may occur:

• | The antilock brake system (ABS) and engine traction (ETS) are disabled.

• | The ABS/traction control system (TCS)/vehicle stability enhancement system (VSES) indicators turn ON.

### Conditions for Clearing the DTC

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

• | The correct calibration must be programmed into the EBCM.

### Diagnostic Aids

If the DTC was set after EBCM replacement, verify that the replacement EBCM and software are correct for the vehicle.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation Reference

ABS Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

• | Connector Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Verify that DTC C0551 programming is not set.

⇒ | If the DTC is set, program the EBCM. If the DTC resets, replace the EBCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming