2010 Cadillac CTS Sedan AWD V6-3.6L Page 721
1. With a scan tool, clear DTC C0550. The DTC should clear.
瀚慖f the DTC will not clear, replace the control module.
2. Ignition OFF, remove the scan tool, open and close the drivers door.
3. Wait 60 seconds, ignition ON, then recheck for DTCs. DTC C0550 should not set.
瀚慖f DTC C0550 sets, replace the module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for control module replacement, setup, and programming
Transfer Case - BW 4477
DTC C0550
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptor
DTC C0550 36
- Electronic Control Unit Malfunction EEPROM Failure
Diagnostic Fault Information
Circuit/System Description
This DTC indicates an EEPROM failure where diagnostic data is stored.
Conditions for Running the DTC
* The ignition is ON.
* System voltage is 9-16 volts.
Conditions for Setting the DTC
The EEPROM has failed and diagnostic data as well as other assorted data can not be stored.
Action Taken When the DTC Sets
* Activation is still disabled until the conditions for setting the DTC are no longer present.
* The SERVICE AWD indicator remains illuminated for the remainder of the current ignition cycle.
Conditions for Clearing the DTC
* The transfer case shift control module clears the DTC if the conditions for setting the DTC are not currently present.
* A history DTC clears after 40 consecutive warm up cycles without a fault present.
* All DTCs can be cleared using a scan tool.
* Clearing DTCs will also clear failure records.
Diagnostic Aids
* Check failure records for further information on the conditions present when this DTC set.
* It is sometimes possible to set this DTC falsely due to low voltage. Attempt to clear this DTC and retest.
