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 Fluid Level Signal

C0267

1

1

--

Brake Fluid Level Ground

--

1

--

--

Park Brake Signal

1

1

1

--

Park Brake Ground

--

1

--

--

1. Brake Warning Indicator Malfunction

Circuit/System Description

The brake fluid level switch monitors the level of brake fluid in the master cylinder. When the electronic brake control module (EBCM) sees the brake fluid level switch input grounded, it sends a serial data message to the instrument panel cluster (IPC) to turn ON the Red Brake Warning indicator.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

    • Low brake fluid is detected.
    • A short to ground exists on the signal circuit.

Action Taken When the DTC Sets

The red Brake warning indicator illuminates.

Conditions for Clearing the DTC

    • The condition for the DTC is no longer present.
    • The EBCM 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

Component Connector End Views

Description and Operation

Brake Warning System Description and Operation

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Inspect for proper brake fluid level, the fluid level should be at or above the proper level.
  2. If low, refer to Brake Fluid Loss.
  3. Ignition ON, observe the scan tool EBCM Brake Fluid Level Switch parameter. The reading should be OK.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the brake fluid level switch.
  2. Test for less than 1 ohm between the ground circuit terminal A and ground.
  3. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool EBCM Brake Fluid Level Status parameter is OK.
  5. If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the IPC.
  6. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool EBCM Brake Fluid Level Status parameter is Low.
  7. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM.
  8. If all circuits test normal, test or replace the brake fluid level switch.

Component Testing

  1. Ignition OFF, disconnect the harness connector at the brake fluid level switch.
  2. Test for infinite resistance between the ground terminal A and the signal terminal B.
  3. If less than the specified value, replace the brake fluid level switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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