my Tesla Model 3 won't start but clicks when I turn the key what should I do

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

555 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 3 that won't start and clicks when turning the key. 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 in 'Park' with the parking brake engaged while performing repairs.

Symptoms

•Clicking sound when turning the key or pressing the start button
•Dashboard lights dimming or flickering
•No engine turnover or cranking sounds
•Possible error messages on the display
•Vehicle not responding to accelerator pedal

Diagnostic Steps

1
Check the vehicle’s battery voltage using a multimeter.
2
Ensure all electrical connections to the battery are secure and free of corrosion.
3
Inspect the 12V battery status through the vehicle's display settings.
4
Verify if the key fob is functioning properly and has a charged battery.
5
Attempt to jump-start the vehicle using an external battery source.

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
•Jumper cables
•Basic hand tools (wrenches, sockets, screwdrivers)

Parts Required

•12V battery (if replacement is necessary)
•Key fob battery (CR2032)

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Diagnostic Steps

1
Check the vehicle’s battery voltage using a multimeter.
2
Ensure all electrical connections to the battery are secure and free of corrosion.
3
Inspect the 12V battery status through the vehicle's display settings.
4
Verify if the key fob is functioning properly and has a charged battery.
5
Attempt to jump-start the vehicle using an external battery source.

Solution

1. Preparation

Gather necessary tools such as a multimeter, jumper cables, and basic hand tools.
Ensure the vehicle is parked in a safe location with enough space to work.
Disconnect the vehicle from any charging station.

2. Check and Replace 12V Battery

Inspect the 12V Battery:
- Locate the 12V battery, which is typically in the front trunk (frunk).
- Use a multimeter to check the voltage; it should be around 12.6 volts.
Replace the Battery if Necessary:
- If the voltage is low, disconnect the negative terminal first, followed by the positive terminal.
- Remove the battery hold-down clamps and lift the battery out.
- Install the new battery by placing it in the tray, securing it with clamps.
- Reconnect the positive terminal first, followed by the negative terminal.

3. Inspect and Clean Electrical Connections

Examine Battery Connections:
- Check for corrosion or loose connections at the battery terminals.
- Clean any corrosion with a mixture of baking soda and water, using a wire brush.
- Tighten all connections to ensure a solid electrical contact.

4. Test Key Fob

Check Key Fob Battery:
- Open the key fob casing and inspect the battery. If it’s weak or dead, replace it with a new CR2032 battery.
- Reassemble the key fob and test its functionality.

5. Jump-Start the Vehicle

Jump-Start Method:
- Connect the jumper cables to a working vehicle's battery using the correct polarity (positive to positive, negative to ground).
- Start the working vehicle and let it charge the Tesla’s battery for a few minutes.
- Attempt to start the Tesla Model 3 again.