my Tesla Model S won't start and just clicks, what should I do

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

478 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 in Tesla Model S. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems to prevent electrical shock or short circuits.

Symptoms

•Engine clicking sound when the start button is pressed
•Dashboard lights may illuminate but the vehicle does not start
•No sound from the electric motor
•Possible low battery warning on the display
•Inability to engage drive or reverse gears

Diagnostic Steps

1
Check the 12V battery voltage using a multimeter; it should be above 12.4 volts.
2
Inspect the 12V battery connections for corrosion or looseness.
3
Verify the status of the main battery pack through the Tesla app or on the dashboard display.
4
Attempt a reset of the vehicle's systems by pressing and holding both scroll wheels on the steering wheel until the touchscreen resets.
5
Scan for error codes using Tesla's diagnostic tools if available.

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
•Torque wrench
•Battery terminal cleaner

Parts Required

•New 12V battery (if necessary)

Related Faults

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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 12V battery connections for corrosion or looseness.
3
Verify the status of the main battery pack through the Tesla app or on the dashboard display.
4
Attempt a reset of the vehicle's systems by pressing and holding both scroll wheels on the steering wheel until the touchscreen resets.
5
Scan for error codes using Tesla's diagnostic tools if available.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is in a safe position and the parking brake is engaged.
Disconnect the 12V battery before performing any work on electrical systems.

2. Inspect and Replace the 12V Battery

Tools Required: Socket set, multimeter, battery terminal cleaner, torque wrench.
Sub-steps:
1. Locate the 12V battery under the front trunk.
2. Remove the negative terminal first, followed by the positive terminal.
3. Use a multimeter to test the battery voltage; if below 12.4 volts, replace the battery.
4. If replacing, remove the old battery by unfastening the retaining strap and lifting it out.
5. Install the new battery, ensuring the correct polarity (positive first, then negative).
6. Tighten the terminals securely and clean any corrosion.

3. Check Battery Management System (BMS)

Tools Required: Tesla diagnostic tool (if available).
Sub-steps:
1. Reconnect the 12V battery and power on the vehicle.
2. Use the diagnostic tool to check the BMS for any faults or errors.
3. If faults are detected, follow the manufacturer's instructions for resolving BMS issues.

4. Final Checks

Ensure all connections are secure.
Recheck the voltage of the 12V battery after installation.
Attempt to start the vehicle again.