GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The EBCM learns the model that it is installed in by using the Vehicle ID information (VIN) via the class 2 serial data line. Each time the vehicle is in the RUN position or the PCM communicates this information via Class 2, the EBCM internally compares the VIN information with that information stored in digits 2 through 5 of the VIN. If digit 5 of the VIN is incorrect, the EBCM will indicate a VIN information error is present.

Conditions for Setting the DTC

    • The EBCM detects digit 5 of the VIN is incorrect.
    • The condition must occur when the ignition switch is first turned on.

Action Taken When the DTC Sets

The EBCM stores DTC C0565 in memory.

Conditions for Clearing the DTC

    • The EBCM recognizes digit 5 of the VIN as valid information.
    • A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Diagnostic Aids

DTC C0565 is related to an internal VIN error in the EBCM. The VIN information is not removable from the EBCM.

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?

Go to Step 2

Go to Diagnostic System Check - ABS

2

Are any other DTCs present besides C0565?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

3

Replace the EBCM with the correct module, and part number. Refer to Electronic Brake Control Module Replacement .

Is the replacement complete?

Go to Step 4

--

4

  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