For 1990-2009 cars only
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 C0550: Electronic Control Unit (ECU) PerformanceCircuit/System Description
The electronic suspension control module (ESCM) detects an internal malfunction.
Conditions for Running the DTC
The ignition is in the RUN position.
Conditions for Setting the DTC
An internal ESCM malfunction exists.
Action Taken When the DTC Sets
One or more of the following actions may occur:
| • | The ESC system is disabled. |
| • | The SERVICE SUSPENSION SYS and SPEED LIMITED message is displayed. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The ESCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. The DTC can be cleared with a scan tool. |
Circuit/System Verification
Verify DTC C0550 is not current.
| ⇒ | If DTC C0550 is current, replace the ESCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ESCM replacement, setup, and programming
