Skip to content
Tahoe / Yukon Service Manual

DTC C2A1B

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 C2A1B Brake System Hydraulic Learn Not Complete 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 System Hydraulic Learn Not Complete Air in the system Actions Taken When the DTC Sets A message and/or warning indicator may be displayed to the driver. Conditions for Clearing the DTC The conditions for setting the DTC no longer exist. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. 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 Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Perform the scan tool configuration/reset function: Brake System Plunger Pressure Rise Starting Point Learn
  3. Clear DTCs
  4. Verify DTC C2A1B is not set. ⇒ If DTC C2A1B is set Perform the following action: Hydraulic Brake System Bleeding 4.1. Clear DTCs 4.2. Verify DTC C2A1B is not set. ⇒ If DTC C2A1B is set Test or replace the component: A104 Brake Master Cylinder ⇓ If DTC C2A1B is not set All OK. ⇓ 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