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Tahoe / Yukon Service Manual

DTC C2A1A (1)

DTC C2A1A 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 C2A1A Brake System Plunger Motor Position Sensor Communication Malfunction 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 Q5 Brake Pressure Modulator = Internal Malfunction Actions Taken When the DTC Sets A message and/or warning indicator may be displayed to the driver. Brake Assist = Reduced Malfunction Indicator Lamp (MIL) = ON DTCs listed in the DTC Descriptor category = Type A DTC 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. Diagnostic Aids Diagnose other DTCs first. 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 Scan Tool Reference Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify DTC C2A1A is not set. ⇒ If the DTC is set 2.1. Perform the scan tool configuration/reset function: Brake System Plunger Motor Position Sensor Learn 2.2. Clear DTCs 2.3. Verify DTC C2A1A is not set. ⇒ If DTC C2A1A is set Test or replace the component: A104 Brake Master Cylinder ⇓ If DTC C2A1A is not set All OK. ⇓ If the DTC is not set
  3. 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