GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The electronic brake control module (EBCM) controls the vehicle stability control (VSC) solenoid. The VSC solenoid circuit is integral part of the EBCM.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1225 Solenoid Circuit Open or Shorted

Conditions for Running the DTC

DTC C1225 can be set anytime the ignition is in the ON position.

Conditions for Setting the DTC

The EBCM detects a fault within the VSC solenoid circuit.

Action Taken When the DTC Sets

    • The traction control and VSC is disabled.
    • The VSC warning indicator turns 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 EBCM internal malfunction
    • If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

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. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition.
  3. Turn ON the ignition, with engine OFF.

Does the DTC reset?

Go to Step 3

Go to Symptoms - Antilock Brake System

3

Replace the brake pressure modulator valve (BPMV). Refer to Brake Pressure Modulator Valve Assembly Replacement .

Did you complete the replacement?

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