GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2006 🢒 GTO 🢒 DTC 🢒 DTC C0550, C0551, or C0569

Circuit Description

This DTC identifies a malfunction within the electronic brake control module (EBCM).

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC C0550 Controller Malfunction
    • DTC C0551 ECU not programmed
    • DTC C0569 System configuration error

Conditions for Running the DTC

DTC can be set anytime the ignition switch is in the ON position.

Conditions for Setting the DTC
    • DTC C0550, EBCM internal fault exists
    • DTC C0551, EBCM not programmed
    • DTC C0569, EBCM system configuration mismatch

Action Taken When the DTC Sets
    • The EBCM disables the antilock brake and traction control systems for the duration of the ignition cycle.
    • The ABS, TRAC OFF and BRAKE warning indicators turn ON.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.

Diagnostic Aids

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.

The following are possible causes of the malfunction:

    • An open, or high resistance in the EBCM ground circuit
    • An open, high resistance or short to ground in the EBCM battery supply voltage circuits
    • An internal EBCM malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests the EBCM ground circuit for an open, or high resistance.

    2.

  2. This step tests the battery supply voltage circuits of the EBCM for an open, high resistance or short to ground.

Step

Action

Yes

No

Schematic Reference: Antilock Brake System Schematics

Connector End View Reference: Antilock Brake System Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Install a scan tool.
  2. Use the scan tool in order to clear the DTCs.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Did DTC C0550, C0551, and C0569 reset?

Go to Step 3

Go to Diagnostic Aids

3

Is DTC C0800 also set?

Go to DTC C0800

Go to Step 4

4

Test the electronic brake control module (EBCM) ground circuit for an open, or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 8

Go to Step 5

5

Test the EBCM battery supply voltage circuits for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 8

Go to Step 6

6

Inspect for poor connections at the harness connector for the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 7

7

Replace the EBCM. Refer to Electronic Brake Control Module Replacement .

Did you complete the replacement?

Go to Step 8

--

8
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK