GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2004 🢒 Vibe - AWD 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C0226-C0256

Circuit Description

The solenoid valves are part of the brake pressure modulator valve (BPMV). The BPMV turns ON and OFF the solenoid valves as deemed necessary to modulate hydraulic pressure to the wheel brakes during an antilock brake system (ABS) stop.

Conditions for Running the DTC

DTC's C0226 - C0256 can be set anytime the ignition switch is in the ON position.

Conditions for Setting the DTC

The electronic brake control module (EBCM) detects one of the following conditions in the solenoid circuitry:

    • An open
    • A short to ground
    • A short to voltage

Action Taken When the DTC Sets
    • The ABS is disabled.
    • The ABS 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 open, high resistance, or a short to ground in the battery positive voltage circuits
    • An open or high resistance in the solenoid ground circuit
    • 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 step numbers on the diagnostic table.

  1. This step determines if the DTC is current.

Step

Action

Yes

No

Schematic Reference: Antilock Brake System Schematics

Connector End View Reference: Antilock Brake System Connector End Views

1

Did you perform A Diagnostic System Check - ABS?

Go to Step 2

Go to Diagnostic System Check - ABS

2

Is DTC C0278 also set?

Go to DTC C0278

Go to Step 3

3

Is DTC C0279 also set?

Go to DTC C0279

Go to Step 4

4

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the scan tool in order to clear the DTCs.
  4. Using the scan tool, cycle the appropriate solenoid in the Special Functions menu.
  5. Read the DTCs.

Does the DTC reset?

Go to Step 5

Go to Diagnostic Aids

5

Replace the Brake Pressure Modulator Valve (BPMV). Refer to Brake Pressure Modulator Valve Assembly Replacement .

Did you complete the replacement?

Go to Step 6

--

6
  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