C0267

DTC C0267

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC C0267 00
- Low Brake Fluid Indicated




Circuit/System Description

The brake fluid level switch monitors the level of brake fluid in the master cylinder. When the instrument panel cluster (IPC) detects the brake fluid level switch input is grounded for 15 seconds, it turns ON the brake warning indicator and sends a GMLAN serial data message to 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 reported by the IPC for 2 seconds.


Action Taken When the DTC Sets

* The brake warning indicator turns ON.
* The driver information center (DIC) displays the LOW BRAKE FLUID message.



Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.



Diagnostic Aids

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


Reference Information
Schematic Reference

Hydraulic Brake Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Brake Warning System Description and Operation (Brake Warning System Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information


Circuit/System Verification

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

• If brake fluid level is low, refer to Hydraulic Brake System Diagnosis (Component Tests and General Diagnostics) .

2. Ignition ON. With the scan tool, select Instrument Panel Cluster, Special Functions, Display Test. Command the instrument panel indicators OFF. Verify that the brake warning indicator turns OFF.

• If the brake warning indicator does not turn OFF, replace the IPC.

3. Disconnect the brake fluid level switch connector. With a scan tool, observe the Brake Fluid Level Switch parameter. Verify that the scan tool Brake Fluid Level Switch parameter is On.

• If the scan tool Brake Fluid Level Switch parameter is Off, replace the brake fluid level switch.

4. Test the brake fluid level sensor signal circuit for a short to ground. Verify that the brake fluid level sensor signal circuit is not shorted to ground.

• If the brake fluid level sensor signal circuit is shorted to ground, repair the circuit.

5. Replace the IPC.



Component Testing
Brake Fluid Level Switch

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

• If brake fluid level is low, refer to Hydraulic Brake System Diagnosis (Component Tests and General Diagnostics) .

2. Ignition OFF. Disconnect the brake fluid level switch connector. Verify that continuity does not exist between terminal A and terminal B of the brake fluid level switch.

• If there is continuity between terminal A and terminal B of the brake fluid level switch when the master cylinder reservoir is full, replace the brake fluid level indicator switch.

3. Remove all of the brake fluid from the master cylinder reservoir. Verify that continuity exists between terminal A and terminal B of the brake fluid level switch.

• If there is no continuity between terminal A and terminal B of the brake fluid level switch when the master cylinder reservoir is empty, replace the brake fluid level indicator switch.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Brake Fluid Level Indicator Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for EBCM or IPC replacement, setup, and programming