my Tesla Model S won't start and makes a clicking noise, what should I check?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

480 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 no-start issue with your Tesla Model S. 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 main power supply before performing any electrical work.
•Always wear gloves and eye protection when handling batteries.

Symptoms

•Clicking noise when attempting to start
•Dashboard lights flickering or dim
•No response from the power button
•Possible 'Low Battery' warning on the screen
•Inconsistent or weak electrical accessories (e.g., lights, radio)

Diagnostic Steps

1
Check the 12V battery voltage using a multimeter; it should be above 12.4 volts.
2
Inspect the battery terminals for corrosion or loose connections.
3
Verify the state of charge of the main battery pack through the Tesla app or vehicle screen.
4
Check for any error messages or alerts on the vehicle’s display.
5
Attempt to jump-start the vehicle using another vehicle or a portable jump starter.

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
•Wire brush
•Terminal cleaner

Parts Required

•New 12V battery (if necessary)

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Diagnostic Steps

1
Check the 12V battery voltage using a multimeter; it should be above 12.4 volts.
2
Inspect the battery terminals for corrosion or loose connections.
3
Verify the state of charge of the main battery pack through the Tesla app or vehicle screen.
4
Check for any error messages or alerts on the vehicle’s display.
5
Attempt to jump-start the vehicle using another vehicle or a portable jump starter.

Solution

1. Preparation

Ensure the vehicle is in "Park."
Gather tools: multimeter, socket set, cleaning supplies.
Disconnect the main power supply if necessary to avoid electrical shock.

2. Inspect and Clean Battery Connections

Sub-steps:
1. Open the front trunk and locate the 12V battery.
2. Disconnect the negative terminal first, followed by the positive terminal.
3. Clean any corrosion from the terminals and cable connectors using a wire brush or terminal cleaner.
4. Reconnect the positive terminal first, followed by the negative terminal.
Tools Required: Wire brush, terminal cleaner.

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

Sub-steps:
1. Use a multimeter to confirm the 12V battery voltage is below 12.4 volts.
2. If low, remove the battery by unscrewing the mounting bracket and disconnecting the terminals.
3. Replace with a new 12V battery (ensure it is compatible with Tesla Model S specifications).
4. Reconnect the battery and ensure all connections are tight.
Parts Required: New 12V battery (if needed).
Tools Required: Socket set, multimeter.

4. Reset Vehicle Systems

Sub-steps:
1. With the vehicle off, press and hold both scroll wheels on the steering wheel until the screen resets.
2. Wait for the vehicle systems to reboot before attempting to start again.