C0550

DTC C0550





Circuit Description
When the ignition switch is turned ON, the rear wheel steering control module monitors communications between its internal microprocessors and performs self-diagnostic tests. If an internal malfunction is detected, the rear wheel steering control module will store a DTC C0550 in its memory.

Conditions for Running the DTC
Turn the ignition switch to the ON position, with engine ON.

Conditions for Setting the DTC
^ The rear wheel steering control 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 Service 4 Wheel Steer indicator in IPC will be displayed.
^ The code is displayed on scan the tool as DTC C0550.
^ The output command to the motor is zeroed. The motor drive circuits are disabled using commands from the rear wheel steering control module to open the power relay. The rear wheels will be returned to the default centered position.

Conditions for Clearing the DTC
^ Conditions for the DTC are not currently present.
^ The module receives a clear code command from the scan tool.
^ The DTC clears after 100 malfunction free ignition cycles.

Diagnostic Aids
^ Since DTC C0550 is an internal malfunction to the rear wheel steering control module, there is not a repair procedure. The rear wheel steering control module must be replaced.
^ The rear wheel steering control 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.
2. This DTC requires rear wheel steering control module replacement.