my GMC Sierra T1XX (2019-Present) won't start but just clicks, what does that mean?

Learn how to diagnose and fix starting issues in your GMC Sierra T1XX. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Ensure the vehicle is parked on a level surface and the ignition is turned off.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• Multimeter
• Socket set
• Wrench set
• Screwdriver set

2. Battery Inspection and Replacement

1. Inspect Battery Terminals

   • Clean any corrosion from the battery terminals using a wire brush.
   • Tighten any loose connections.

2. Test Battery

   • Reconnect the battery and use the multimeter to check voltage again.
   • If the voltage is still low (below 12.4 volts), proceed to replace the battery.

3. Replace Battery (if necessary)

   • Remove the negative cable first, followed by the positive cable.
   • Unscrew and remove the battery hold-down bracket.
   • Lift the old battery out and replace it with a new battery, ensuring correct orientation.
   • Reinstall the hold-down bracket, then connect the positive cable followed by the negative cable.

3. Starter Motor Inspection

1. Remove Starter Motor

   • Disconnect the negative battery terminal again for safety.
   • Remove the electrical connectors from the starter.
   • Unbolt the starter from its mounting location using the socket set.

2. Inspect Starter

   • Test the starter motor directly by connecting it to a known good battery.
   • If the starter does not engage, it must be replaced.

3. Install New Starter

   • Position the new starter in place and bolt it securely.
   • Reconnect the electrical connectors to the starter.

4. Final Checks

• Reconnect the negative battery terminal.
• Start the vehicle to confirm the repair was successful.