my Tesla Model S Original (2012-2020) makes a clicking sound when I try to start it

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

539 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix the clicking sound when starting your Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems
•Ensure the vehicle is completely powered off before starting repairs

Symptoms

•Clicking sound when the start button is pressed
•Dashboard lights flickering or dim
•No power to the vehicle (e.g., no response from the touchscreen)
•Reduced range displayed on battery indicator
•Unable to engage drive or reverse

Diagnostic Steps

1
Check the battery voltage using a multimeter to ensure it is within the acceptable range (12.4V - 12.6V for a fully charged 12V battery)
2
Inspect the 12V battery connections for corrosion or loose terminals
3
Use the Tesla app or onboard diagnostics to check for any error messages or alerts
4
Test the main battery pack’s state of charge and health through the vehicle’s diagnostics
5
Inspect the drive unit functionality by attempting to engage the vehicle in Drive or Reverse mode
6
Check for any service alerts or updates via the Tesla service platform

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Multimeter
•Socket set
•Cleaning supplies (baking soda and water mixture)

Parts Required

•12V battery (if replacement is necessary)

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Diagnostic Steps

1
Check the battery voltage using a multimeter to ensure it is within the acceptable range (12.4V - 12.6V for a fully charged 12V battery)
2
Inspect the 12V battery connections for corrosion or loose terminals
3
Use the Tesla app or onboard diagnostics to check for any error messages or alerts
4
Test the main battery pack’s state of charge and health through the vehicle’s diagnostics
5
Inspect the drive unit functionality by attempting to engage the vehicle in Drive or Reverse mode
6
Check for any service alerts or updates via the Tesla service platform

Solution

1. Preparation

Gather tools: multimeter, socket set, and cleaning supplies.
Ensure the vehicle is parked on a level surface and turned off.
Disconnect the vehicle from any charging source.

2. Inspect and Clean Battery Connections

Sub-step 1: Open the trunk and locate the 12V battery compartment.
Sub-step 2: Use a socket set to remove the battery cover.
Sub-step 3: Inspect the battery terminals for corrosion. If corrosion is present, clean it using a mixture of baking soda and water.
Sub-step 4: Tighten any loose connections using the socket set.

3. Test and Replace the 12V Battery (if necessary)

Sub-step 1: Reconnect the multimeter to the battery terminals to verify voltage. If the voltage is below 12.4V, proceed to replace the battery.
Sub-step 2: Disconnect the negative terminal first, then the positive terminal from the old battery.
Sub-step 3: Remove the old battery from the compartment and set the new battery in place.
Sub-step 4: Connect the positive terminal first, then the negative terminal.
Sub-step 5: Confirm all connections are tight and secure.

4. Verify Drive Unit Functionality

Sub-step 1: Reconnect the vehicle to the charging station to ensure the main battery is charged.
Sub-step 2: Attempt to start the vehicle again after ensuring the 12V battery is functional.
Sub-step 3: If the clicking persists, further diagnostics may be needed on the drive unit or main battery pack.