C0550

Circuit Description
The CVRSS control module performs internal checks of all internal program and data memory spaces. Additionally, various internal functions and data communications are monitored for valid operation.

Conditions for Running the DTC
^ The ignition is on.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with the scan tool.

Conditions for Setting the DTC
The DTC is set when the hardware faults internal to the Electronic Suspension Control Module.

Action Taken When the DTC Sets
Depending upon which internal functions are affected by the fault condition, the CVRSS control module will take one of two sets of actions:
^ If the fault condition allows continued output operation, the system will enter a Speed Dependent Damping mode, in which all four comers of the vehicle are concurrently driven by a fixed PWM duty cycle, which increases as a function of vehicle speed. The SERVICE RIDE CONTROL will be displayed.
^ If the fault is more severe, the control module will disable ALL dampers by commanding 0 % PWM duty cycle, disabling the damper switched battery circuit, and sending a message to the Powertrain Control Module (PCM) to limit vehicle speed. The SERVICE RIDE CONTROL will be displayed.

Conditions for Clearing the MIL/DTC
^ The scan tool can be used to clear the DTC.
^ The On-Board diagnostic CLEAR RSS CODES feature can be used to clear the DTC.
^ The DTC is saved as history when the Electronic Suspension Control Module no longer senses the hardware fault and the ignition is cycled OFF and ON. The DTC will clear it the fault does not return after 50 consecutive ignition cycles.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks to see if the fault condition is active or intermittent.
3. This step checks to see if a HISTORY DTC C0550 will return.
4. This step checks to see if the vehicle has a known intermittent problem.






DTC C0550 ECU Malfunction