Circuit Description
When the ignition switch 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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0550 Electronic Control Unit (ECU) Performance
DTC Symptom | DTC Symptom Descriptor |
|---|---|
31 | General Checksum Failure |
32 | General Memory Failure |
38 | Supervision Software Failure |
39 | Internal Electronic Failure/Discard |
Conditions for Running the DTC
The 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
| • | Stores a DTC C0550 in the ESC memory |
| • | Disable all functionality |
| • | Sends 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 change 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. |
| • | Use the IPC clearing DTC feature. |
| • | Using a scan tool. |
Diagnostic Aids
| • | Since DTC C0550 is an internal malfunction to the ESC module, there is no repair procedure and the ESC module must be replaced. |
| • | The ESC module tests for multiple internal malfunctions and will store a DTC C0550 if one or more internal malfunctions are detected. Therefore, depending on which malfunction was detected, and what internal circuitry was affected, this DTC may cause various symptoms. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Suspension Controls Schematics Connector End View Reference: Suspension Controls Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Replace the electronic suspension control (ESC) module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | System OK | -- | |
