C0130

DTC C0130
DTC Descriptor
DTC C0130
Low Brake Fluid Circuit Open

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Diagnostic System Check - Vehicle





Circuit/System Description
The electronic brake control module (EBCM) sends 12 volts across the low brake fluid circuit. The brake fluid level sensor has an internal resistor between the contacts of the normally open switch. The EBCM can determine the difference between low brake fluid and an open circuit by calculating the current change of the low brake fluid signal circuit when the switch closes or the circuit becomes open.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
The EBCM detects an open in the low brake fluid circuit.

Action Taken When the DTC Sets
^ The EBCM disables the traction control system (TCS)/dynamic rear proportion (DRP)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
^ The Brake Warning indicator turns ON.
^ The Stability Caution indicator turns ON.
^ The driver information center (DIC) displays the SERVICE STAB SYS message.
^ The DIC displays the TRAC FAILED messages.

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.

Diagnostic Aids
The brake fluid reservoir and brake fluid level switch can not be serviced separately.

Reference Information
Schematic Reference
Brake Warning System Schematics

Connector End View Reference
Hydraulic Brakes 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 Testing
1. Turn the ignition OFF. Disconnect the low brake fluid sensor harness connector. Connect a 3-amp fused jumper wire between the 2 terminals of the low brake fluid sensor harness connector. Turn ON the ignition.
^ If DTC C0268 sets, replace the brake fluid reservoir.

2. Connect one end of a test lamp to battery positive voltage and touch the other to the ground circuit at the low brake fluid harness connector. The test lamp should illuminate.
^ If the test lamp does not illuminate, repair the open in the ground circuit.
^ If the test lamp does illuminate, repair the open in the low brake fluid signal circuit.
^ If no wiring faults can be found, replace the EBCM.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

^ Master Cylinder Reservoir Replacement
^ Control Module References for EBCM/brake pressure modulator valve (BPMV) replacement, setup, and programming