Skip to content
Tahoe / Yukon Service Manual

DTC C15C7

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC C15C7 Brake Boost System Deactivated Symptom Byte Information: Symptom Byte List Circuit/System Description For an overview of the component/system, refer to: ABS Description and Operation Conditions for Running the DTC Ignition/Vehicle = ON Conditions for Setting the DTC Brake Bleed Process Not Completed Actions Taken When the DTC Sets ABS Indicator Control = ON Traction/Stability Control Indicator = ON Malfunction Indicator Lamp (MIL) = ON Brake warning indicator malfunction. = ON DTCs listed in the DTC Descriptor category = Type A DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information Schematic Reference Antilock Brake System Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

  1. Visually inspect the brake fluid level through the brake master cylinder reservoir. Refer to: Brake Master Cylinder Reservoir Filling
  2. Perform the scan tool control function: Automated Brake Bleed
  3. Confirm the B20 Brake Fluid Level Sensor electrical connector is connected.
  4. Ignition/Vehicle » Off — For greater than 10 s
  5. Clear DTCs Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Brake Master Cylinder Replacement - With Power Brake Booster and Electronic Brake Control Module For control module replacement, programming, and setup refer to: Control Module References