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Tahoe / Yukon Service Manual

DTC C2A1D

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 C2A1D Park Brake in Service Release Mode Symptom Byte Information: Symptom Byte List Circuit/System Description For an overview of the component/system, refer to: Electronic Parking Brake Description

Component Description
Park Brake Actuator The park brake function uses the same brake pads as the operational brake. An electric motor is used to apply and release the brake pads.
K160 Brake System Control Module The control module K160 can increase and decrease the brake pressure on all 4 wheels individually in order to fulfill these functions: Antilock Braking Traction Control Vehicle Stability Control The control module K160 can also influence the following control modules to limit the amount of produced torque: K20 Engine Control Module K71 Transmission Control Module

Conditions for Running the DTC Ignition = On or Vehicle = Service Mode System Voltage = 9 to 16 V Conditions for Setting the DTC Parking Brake Actuator = Service Release 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. Reference Information Schematic Reference Park 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 C2A1D is not set. ⇒ If the DTC is set 2.1. Verify the condition does not exist: Left and Right Park Brake Actuator Status= Service Release ⇒ If a condition exists Perform the control function: Deactivate Rear Park Brake Service Position. ⇓ If no condition exists Perform the following learn procedure: Park Brake Calibration ⇓ If the DTC is not set
  3. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References