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 provide an overview of each diagnostic category.

### DTC Descriptors

DTC C0558 55: Calibration Data Too Few Transitions
DTC C0558 5A: Calibration Data Not Plausible

### Circuit/System Description

The electric parking brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The electric parking brake control module also contains the logic for applying and releasing the parking brake when commanded by the electric parking brake switch. When the electric parking brake control module receives a signal from the switch the internal circuit board temperature is checked to verify it is within operating range before the control module performs the requested operation.

### Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

### Conditions for Setting the DTC

#### C0558 55

The electric parking brake control module detects a calibration malfunction.

#### C0558 5A

The electric parking brake control module detects mechanical problems with the parking brake system.

### Action Taken When the DTC Sets

#### C0558 55

• | The electric parking brake is disabled, switch command will not be accepted.

• | A message and/or a warning indicator may be displayed.

#### C0558 5A

• | The electric parking brake is disabled, one release allowed.

• | A message and/or a warning indicator may be displayed.

### Conditions for Clearing the DTC

• | The electric parking brake control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.

• | Calibrate the electric parking brake control module.

### Diagnostic Aids

• | Verify the electric parking brake control module software and calibrations are the newest available versions.

• | Verify the parking brake cable is not broken or pinched.

### Reference Information

#### Schematic Reference

Park Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Electronic Parking Brake Control Module Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Verify DTC C0558 is not set.

⇒ | If DTC is set, perform the Parking Brake Calibration procedure in Module Setup.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for electric parking brake control module replacement, setup, and programming.