my Tesla Model 3 Original (2017-2023) won't start and just clicks, what should I do?

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

565 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 starting issues in Tesla Model 3 (2017-2023). 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 12V battery before working on electrical systems.
•Ensure the vehicle is in a safe location and cannot roll while working on it.

Symptoms

•Clicking noise heard when trying to start the vehicle
•Dashboard lights illuminate briefly
•No engine cranking or starting
•Potential loss of power to accessories
•Error messages may appear on the display

Diagnostic Steps

1
Ensure the vehicle is in 'Park' and attempt to start the vehicle again.
2
Check the 12V battery status using the vehicle's display or an OBD-II scanner.
3
Inspect the battery terminals for corrosion or loose connections.
4
Verify the state of charge of the main battery via the Tesla app or onboard display.
5
Conduct a visual inspection of the main battery and 12V battery for any signs of damage.
6
Attempt to jump-start the vehicle with a compatible jump starter or another vehicle.

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

•Socket set
•Multimeter
•Battery terminal cleaner
•OBD-II scanner

Parts Required

•12V battery (Group 48 or compatible)

Related Faults

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Diagnostic Steps

1
Ensure the vehicle is in 'Park' and attempt to start the vehicle again.
2
Check the 12V battery status using the vehicle's display or an OBD-II scanner.
3
Inspect the battery terminals for corrosion or loose connections.
4
Verify the state of charge of the main battery via the Tesla app or onboard display.
5
Conduct a visual inspection of the main battery and 12V battery for any signs of damage.
6
Attempt to jump-start the vehicle with a compatible jump starter or another vehicle.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is safely parked and in "Park" mode.
Wear safety gloves and goggles.

2. Check and Replace 12V Battery

Tools Required: Socket set, multimeter, battery terminal cleaner.
Sub-steps:
1. Disconnect the negative terminal of the 12V battery to ensure safety.
2. Remove the cover of the 12V battery.
3. Using the multimeter, test the 12V battery voltage; it should be above 12.4V.
4. If the voltage is low or the battery is faulty, remove the positive terminal first, followed by the negative terminal.
5. Replace the old battery with a new, compatible 12V battery (typically a Group 48 or similar).
6. Reconnect the terminals, starting with the positive terminal followed by the negative terminal.
7. Reinstall the battery cover.

3. Inspect and Test Main Battery

Tools Required: OBD-II scanner (if necessary).
Sub-steps:
1. If the 12V battery was replaced and the vehicle still does not start, verify the main battery's charge state through the vehicle's diagnostics.
2. Ensure that there are no fault codes present. Clear any errors if found.
3. If necessary, connect the vehicle to a Tesla Supercharger or home charging station to ensure the battery is charged.

4. Verify Connections and Components

Tools Required: Basic hand tools for tightening connections.
Sub-steps:
1. Inspect all high-voltage connections for tightness and integrity.
2. Ensure that all fuses related to starting systems are intact and functional.
3. If necessary, consult a Tesla service manual for specific components related to starting.