what does error code C0455 mean for GMC Sierra T1XX (2019-Present)?

Learn how to diagnose and fix error code C0455 related to the brake actuator in GMC Sierra T1XX. Step-by-step guide with diagnostic and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Clean Brake Actuator

• Remove any debris or contaminants around the brake actuator.
• Use brake cleaner to clean the actuator and surrounding components without damaging electrical connections.

3. Repair or Replace Faulty Components

• If damage is found during inspection:
  • Repair: Check wiring harness for shorts or breaks. Repair any damaged wires with electrical tape or soldering as needed.
  • Replace: If the actuator is faulty, remove the old actuator by:
    • Disconnecting electrical connectors.
    • Unfastening mounting bolts using a socket set (typically 10mm).
    • Installing a new actuator in reverse order, ensuring proper torque (specific torque values may vary; consult the service manual for the exact specification).

4. System Recalibration

• After replacing the actuator, perform a system recalibration using a scan tool to ensure the brake system operates within specifications.

5. Reconnect Battery

• Reconnect the negative battery terminal and ensure all connections are secure.