how to fix my Tesla Model S Original (2012-2020) that won't start and just clicks

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

588 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 a Tesla Model S that won't start and just clicks. 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 negative terminal before working on the battery to prevent electrical shorts.
•Allow the vehicle to sit for a few minutes after disconnecting before servicing the battery.

Symptoms

•Clicking sound when the start button is pressed
•Dashboard lights dimming or flickering
•No power to the vehicle’s accessories
•Power reduced message on the screen
•Unable to engage the drive selector

Diagnostic Steps

1
Check the state of the 12V battery using a multimeter to measure voltage.
2
Inspect the battery terminals for corrosion or loose connections.
3
Attempt to jump-start the vehicle to determine if the 12V battery is the issue.
4
Verify the condition of the main battery pack using the Tesla app or onboard diagnostics.
5
Scan for error codes using a compatible OBD-II scanner to check for any related issues.

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
•10mm socket wrench
•Jumper cables

Parts Required

•Replacement 12V battery

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Diagnostic Steps

1
Check the state of the 12V battery using a multimeter to measure voltage.
2
Inspect the battery terminals for corrosion or loose connections.
3
Attempt to jump-start the vehicle to determine if the 12V battery is the issue.
4
Verify the condition of the main battery pack using the Tesla app or onboard diagnostics.
5
Scan for error codes using a compatible OBD-II scanner to check for any related issues.

Solution

1. Preparation

Tools Required: Multimeter, 10mm socket wrench, jumper cables (if jump-starting).
Ensure the vehicle is parked in a safe location and is turned off.
Disconnect the negative terminal of the 12V battery to prevent any electrical shorts.

2. Inspect and Test the 12V Battery

Sub-steps:
1. Use the multimeter to check the voltage of the 12V battery. A healthy battery should read approximately 12.6 volts or higher.
2. If the voltage is below 12.4 volts, consider replacing the battery.
3. Clean the battery terminals with a wire brush if corrosion is present.
4. Reconnect the terminals securely and ensure they are tight.

3. Jump-Start the Vehicle (if necessary)

Sub-steps:
1. Connect the positive (red) jumper cable to the positive terminal of the 12V battery.
2. Connect the other end of the positive jumper cable to the positive terminal of the donor vehicle's battery.
3. Connect the negative (black) jumper cable to the negative terminal of the donor vehicle's battery.
4. Connect the other end of the negative cable to a grounded metal point on the Tesla.
5. Start the donor vehicle and allow it to charge the Tesla's battery for a few minutes before attempting to start the Tesla.

4. Replace the 12V Battery (if needed)

Sub-steps:
1. If the battery is confirmed defective, remove the negative terminal first, followed by the positive terminal.
2. Remove the battery hold-down bracket using a 10mm socket wrench.
3. Carefully lift the old battery out and replace it with a new compatible 12V battery (usually an AGM type).
4. Reinstall the hold-down bracket and reconnect the positive terminal first, followed by the negative terminal.