GM Service Manual Online
For 1990-2009 cars only

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 Descriptor

DTC C0267 : Low Brake Fluid Indicated

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Brake Warning Indicator Control Circuit

C0267

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--

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Ground

--

--

--

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Circuit/System Description

The brake fluid level switch monitors the level of brake fluid in the master cylinder. When the instrument panel cluster (IPC) sees the brake warning indicator control circuit grounded, it turns ON the brake warning indicator and sends a serial data message to the electronic brake control module (EBCM) that tells the EBCM that the brake fluid level is low.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

Low brake fluid is detected.

Action Taken When the DTC Sets

    • The EBCM disables the ABS/TCS/DRP for the duration of the ignition cycle.
    • The ABS indicator turns ON.
    • The Traction Control indicator turns ON.
    • The red brake warning indicator turns ON.
    • The driver information center (DIC) displays the SERVICE BRAKE SYSTEM/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.

Reference Information

Schematic Reference

Hydraulic Brake Schematics

Connector End View Reference

Antilock Brake System Connector End Views

Electrical Information Reference

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

Scan Tool Reference

Scan Tool Data List

Circuit/System Verification

Inspect the master cylinder reservoir for the proper brake fluid level.

If brake fluid level is low, refer to Hydraulic Brake System Diagnosis .

Circuit/System Testing

Important: This test should only be performed if brake fluid is not low.

  1. With the park brake released and the ignition OFF, disconnect the brake fluid level switch connector. Ignition ON, verify the brake indicator lamp on IPC is illuminated.
  2. If the Brake indicator lamp is not illuminated, replace the brake fluid level switch.
  3. With the ignition ON, use a scan tool to observe the Brake Fluid Switch parameter in IPC. Verify parameter is OK.
  4. If the Brake Fluid Switch parameter is Low, repair short to ground in the brake warning indicator control circuit.
  5. Replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Brake Fluid Level Indicator Switch Replacement
    •  Control Module References for IPC replacement, setup, and programming