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 automatic level control (ALC) sensor detects an internal malfunction.
Conditions for Running the DTC
The ignition switch is in the ON position.
Conditions for Setting the DTC
An internal ALC sensor malfunction exists.
Action Taken When the DTC Sets
One or more of the following actions may occur:
| • | The ALC system is disabled. |
| • | The SERVICE SUSPENSION SYS message is displayed. |
Conditions for Clearing the MIL/DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Circuit/System Verification
DTC C0550 will set as result of internal ALC sensor circuit failure.
| ⇒ | Replace the ALC sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References - Automatic Level Control Sensor
