DTC C0550. Cadillac CTS 2009

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2009 🢒 CTS 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC C0550

•	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 C0550 36: Electronic Control Unit Malfunction EEPROM Failure

Circuit	Short to Ground	Open/High Resistance	EEPROM Failure	Internal Electronic Failure
Electronic Control Unit Malfunction	--	--	C0550 36	--

This DTC indicates an EEPROM failure where diagnostic data is stored.

•	The ignition is ON.

•	System voltage is 9-16 volts.

The EEPROM has failed and diagnostic data as well as other assorted data can not be stored.

•	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.

•	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.

•	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.

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Control Module References for scan tool information.

If this DTC sets attempt to clear the DTC and Retest.

⇒	If the DTC is cleared, but then resets then replace the transfer case control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for TCSCM replacement, setup, and programming.