Electronic Suspension Control

DTC C0550

DTC Descriptor

DTC C0550 31

Electronic Control Unit (ECU) Performance. - General Checksum Failure

DTC C0550 32

Electronic Control Unit (ECU) Performance. - General Memory Failure

DTC C0550 38

Electronic Control Unit (ECU) Performance. - Supervision Software Failure

DTC C0550 39

Electronic Control Unit (ECU) Performance. - Internal Electronic Failure/Discard

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Circuit/System Description

When the ignition is turned ON, the electronic suspension control (ESC) module monitors communications between its internal microprocessors and performs self-diagnostic tests. If an internal malfunction is detected, the ESC module will store a DTC C0550 in its memory.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

* The ESC module detected an internal malfunction.
* The malfunction must be detected when the ignition switch is first turned on.

Action Taken When the DTC Sets

* The ESC module disables all ESC functionality.
* The ESC module disables all ESC functionality a message to the instrument panel cluster (IPC) to display the SERVICE SUSPENSION SYSTEM message

Conditions for Clearing the DTC

* Under all fault conditions, the ignition must be cycled before this DTC can be changed from current to history.
* The ESC module no longer detects any internal malfunctions when the ignition is first turned to the ON position.
* A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Circuit/System Verification

Verify that DTC C0550 is not set

If the DTC, is set replace the ESC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

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