why does my GMC Sierra T1XX (2019-Present) make a clicking noise when I turn the key?

Learn how to diagnose and fix the clicking noise when turning the key in GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is in "Park" (automatic) or "Neutral" (manual).

2. Battery Inspection and Replacement

1. Inspect Battery Terminals
   • Clean any corrosion with a wire brush.
   • Tighten the terminal connections securely.
2. Test Battery Voltage
   • Reconnect the battery and use a multimeter to check voltage.
   • If below 12.4 volts, replace the battery.
3. Battery Replacement
   • Remove the battery hold-down bracket using a socket set.
   • Disconnect the positive terminal followed by the negative terminal.
   • Replace the battery with a new one of the same specifications.
   • Reconnect terminals in reverse order and secure the battery.

3. Starter Inspection and Replacement

1. Inspect Starter Connections
   • Check the wiring harness and connections to the starter for damage.
   • Tighten any loose connections.
2. Remove Starter
   • Disconnect the battery again.
   • Remove the starter mounting bolts with a socket set.
   • Disconnect the electrical connectors from the starter.
3. Install New Starter
   • Position the new starter in place.
   • Reconnect the electrical connectors securely.
   • Reinstall the starter mounting bolts and torque them to manufacturer specifications.

4. Verify Ignition Switch

1. Test Ignition Switch
   • Use a multimeter to check for continuity when the key is turned to the "Start" position.
   • Replace the ignition switch if it fails the continuity test.