GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 STS 🢒 DTC 🢒 DTC C0552

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 Descriptors

DTC C0552: Improper Shutdown

Circuit/System Description

When ignition voltage is supplied to the electronic brake control module (EBCM) it becomes active. Battery positive voltage is used by the EBCM to run the antilock brake system (ABS), traction control system (TCS), vehicle stability enhancement system (VSES) and dynamic rear proportion (DRP). When the key is turned OFF and ignition voltage is removed from the EBCM, the system performs an internal shutdown procedure.

Conditions for Running the DTC
    • The ECM power down process in the last drive cycle completely finished.
    • The ABS conditions and the braking conditions are normal.

Conditions for Setting the DTC

Battery positive voltage or the EBCM ground circuit is disconnected during system operation.

Action Taken When the DTC Sets

There are no actions taken specifically for this DTC. Serial data communication DTCs will normally be accompanied with DTC C0552. The following actions are a result of a loss of communication with the EBCM.

    • The EBCM is disabled.
    • Dynamic rear proportion (DRP) is disabled.
    • The Brake Warning indicator turns ON.
    • The traction control system (TCS) is disabled.
    • The vehicle stability enhancement system (VSES) is disabled.
    • The ABS indicator turns ON.
    • The driver information center (DIC) displays the Service Stability System message.
    • The DIC displays the Service Traction System message.

Conditions for Clearing the DTC
    • The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
    • The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
    • A loss of battery ground.
    • A disconnected battery
    • A sudden drop in the system voltage to less than 5 volts.
    • Poor power or ground connections.
    • An internal EBCM malfunction.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Engine Control Module Description

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing
  1. Ignition OFF, disconnect the EBCM harness connector and connect a test lamp between the battery positive voltage circuit terminal going to the EBCM, and to ground.
  2. Ignition ON, verify that the test lamp illuminates.
    3. ⇒If the test lamp does not illuminate, repair the open or high resistance in the battery positive voltage circuit.
  3. Connect a test lamp between the battery positive voltage circuit and EBCM ground circuit at the EBCM connector, verify that the test lamp illuminates.
    4. ⇒If the test lamp does not illuminate, repair the open or high resistance in the EBCM ground circuit.
    ⇒ If test lamp illuminates replace the EBCM.
    ⇒If test lamp does not illuminate replace the refer to Diagnostic Aids.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM control module replacement, setup, and programming