C0267

DTC C0267

Diagnostic Instructions

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

DTC Descriptor
DTC C0267 00
- Low Brake Fluid Indicated

Diagnostic Fault Information





Circuit/System Description

The instrument cluster turns ON the brake warning indicator for 5 seconds after ignition ON as a test of the indicator warning lamps. When the fluid within the brake fluid reservoir is low, contacts within the sensor closes causing the voltage within the sensor signal circuit to drop. The electronic brake control module (EBCM) will detect the voltage drop and will send a serial data message to the instrument cluster commanding the brake warning indicator to illuminate.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

* The EBCM detects a short to ground in the brake fluid level signal circuit for 60 seconds.
* The EBCM detects that the brake fluid level is below the MIN level for 60 seconds.

Action Taken When the DTC Sets

One or more of the following actions may occur:

* The vehicle stability enhancement system (VSES) and traction control system (TCS) is disabled.
* A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The DTC will be current for as long as the condition exists.
* The DTC will become history when the brake fluid level is above the MIN level.
* The DTC will become history when the condition for setting the fault is no longer present.
* A history DTC will clear after 50 ignition cycles.

Reference Information
Schematic Reference

Hydraulic Brake Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

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

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Inspect the brake fluid level within the brake master cylinder reservoir, the fluid level should be above the MIN level.

• If not the specified condition, refer to Brake Fluid Loss (Brake Fluid Loss).

2. Ignition ON, observe the scan tool Brake Fluid Level Sensor parameter. The reading should be OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B20 brake fluid level switch.
2. Test for less than 5 ohm between the ground circuit terminal B and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Brake Fluid Level Sensor parameter is OK.

• If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the K17 EBCM.

4. Install a 3 A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B.
5. Verify the scan tool Brake Fluid Level Sensor parameter is Low. The parameter may take up to 60 seconds to go from OK to Low.

• 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 K17 EBCM.

6. If all circuits test normal, test or replace the B20 brake fluid level switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the B20 brake fluid level switch.
2. With the brake fluid in the brake master cylinder reservoir above the MIN level, test for infinite resistance between the signal terminal A and the ground terminal B.

• If not the specified value, replace the B20 brake fluid level switch.

3. With the brake master cylinder reservoir empty, test for less than 2 ohm between the signal terminal A and the ground terminal B.

• If greater than the specified range, replace the B20 brake fluid level switch.

Repair Instructions

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

* Master Cylinder Reservoir Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for EBCM replacement, setup and programming