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 C0558 4B: Calibration Mismatch

### Circuit/System Description

The rear differential clutch control module (RDCCM) is required to have the correct calibration data (matching ID) stored in the memory from the AWD coupling control, and is part of the programming used to perform all wheel drive functions.

### Conditions for Running the DTC

• | The ignition switch is in the ON position.

• | Ignition voltage is greater than 9 volts.

### Conditions for Setting the DTC

The calibration data (matching ID) of the RDCCM is not programmed or incorrectly programmed.

### Action Taken When the DTC Sets

One or more of the following actions may occur:

• | All Wheel Drive Off (AWD Disabled) DIC message.

• | Service All Wheel Drive (Service AWD) DIC message.

### Conditions for Clearing the DTC

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

• | The DTC is not detected in 40 consecutive drive cycles.

### Reference Information

#### Schematic Reference

All-Wheel Drive Schematics

#### Connector End View Reference

Transfer Case Control Connector End Views

#### Description and Operation

All-Wheel Drive Description and Operation

#### 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 that DTC C0558 is not set.

If the DTC is set, calibrate the RDCCM. If the DTC resets, replace the RDCCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for RDCCM replacement, setup, and programming