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Tahoe / Yukon Service Manual

DTC C055F

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 C055F Brake Booster Hydraulics Performance 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 = OFF Conditions for Setting the DTC Brake System Control Module = Internal Malfunction Actions Taken When the DTC Sets A message and/or warning indicator may be displayed to the driver. 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 Diagnostic Aids If during testing the Brake Hydraulics Test still fails after performing the Hydraulic Brake System Bleeding at least 3 times, performing the scan tool control function test Brake System Hydraulics Corner Test can be performed to help isolate the concern. The Brake System Hydraulics Corner Test is not to be used in place of the Brake Hydraulics Test. Inspect the calipers, check for worn or tapered pads, seized pistons or guide pins. Refer to: Disc Brake System Diagnosis Reference Information Schematic Reference Antilock Brake System Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Ci it T ti 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. Ignition/Vehicle » Off
  2. Verify there are no leaks in the component/system: Brake System » Refer to: Brake Fluid Loss
  3. Ignition » On / Vehicle » In Service Mode & Brake Pedal Not Applied — Greater than 30 s
  1. Perform the scan tool control function: Brake Hydraulics Test ⇒ If the procedure/test does not pass Bleed the brake system. Refer to: Hydraulic Brake System Bleeding ⇓ If the procedure/test passes
  2. Ignition/Vehicle » Off
  3. Ignition » On / Vehicle » In Service Mode
  4. Verify DTC C055F is not set. ⇒ If the DTC sets Replace the component: A104 Brake Master Cylinder ⇓ If the DTC is not set
  5. All OK. 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