Service Information

Spark

DTC C056D

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 C056D 00: Electronic Control Unit Hardware Internal Error

Circuit/System Description

The electronic control module (EBCM) detects an internal malfunction.

Conditions for Running the DTC

•	The ignition is ON.

•	Ignition voltage is greater than 8 volts.

Conditions for Setting the DTC

The EBCM detects an internal malfunction.

Action Taken When the DTC Sets

•	The EBCM disables the antilock brake system (ABS)/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.

•	ABS warning indicator may be displayed.

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 40 consecutive drive cycles.

•	The DTC can be cleared using a scan tool.

Reference Information

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 C056D is not set.

⇒	If DTC is set, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming.