For 1990-2009 cars

### 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
--- | --- | --- | --- | ---
Signal | C0267 | -- | -- | --

### Circuit/System Description

The brake fluid level switch monitors the level of brake fluid in the master cylinder. When the body control module (BCM) sees the brake fluid level switch input grounded, it turns ON the red Brake 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 Antilock Brake System (ABS)/Traction Control System (TCS) dynamic rear proportion (DRP).

• | The ABS indicator turns ON.

• | The traction control indicator turns ON.

• | The red Brake warning indicator turns ON.

### 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

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

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

If brake fluid level is low, refer to Brake Fluid Loss Diagnostic Information and Procedures.

### Circuit/System Testing

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

1. With the ignition OFF, disconnect the brake fluid level switch connector.
2. With the ignition ON, use a scan tool to observe the Brake Fluid Switch parameter in Antilock Brake data list.

⇒ | If the Brake Fluid Switch parameter is OK, replace the brake fluid level switch.

⇒ | If the Brake Fluid Switch parameter is Low, repair short to ground in signal circuit.

3. If all circuits test normal, replace the BCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Brake Fluid Level Indicator Switch Replacement

• | Control Module References for EBCM