how to fix Tesla Model 3 Original (2017-2023) that won't start and just clicks

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

539 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 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 12V battery before working on electrical components.
•Ensure the vehicle is in 'Park' with the parking brake engaged before starting any repairs.

Symptoms

•Clicking noise when the ignition is attempted
•Dashboard lights may flicker or dim
•No engine cranking or turning over
•Possible 'Low Battery' warning on the display
•Inoperable electric accessories, like windows or infotainment system

Diagnostic Steps

1
Ensure the vehicle is in 'Park' mode.
2
Check the 12V battery voltage using a multimeter. It should be above 12.4V.
3
Test the 12V battery connections for corrosion or looseness.
4
Inspect the main battery pack for any signs of damage or disconnection.
5
Use the Tesla app to check for any alerts or notifications regarding battery status.
6
Verify if any recent software updates were completed successfully and review vehicle settings.

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
•Basic hand tools (socket set)
•Portable jump starter

Parts Required

•Replacement 12V battery

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Diagnostic Steps

1
Ensure the vehicle is in 'Park' mode.
2
Check the 12V battery voltage using a multimeter. It should be above 12.4V.
3
Test the 12V battery connections for corrosion or looseness.
4
Inspect the main battery pack for any signs of damage or disconnection.
5
Use the Tesla app to check for any alerts or notifications regarding battery status.
6
Verify if any recent software updates were completed successfully and review vehicle settings.

Solution

1. Preparation

Gather tools and parts: multimeter, basic hand tools (socket set), and potentially a replacement 12V battery.
Ensure the vehicle is parked in a safe location, and the parking brake is engaged.

2. Inspect and Test the 12V Battery

Sub-step 1: Open the front trunk (frunk) and locate the 12V battery.
Sub-step 2: Disconnect the negative terminal first, followed by the positive terminal to prevent any electrical shorts.
Sub-step 3: Use a multimeter to measure the voltage of the 12V battery. If below 12.4V, proceed to replace the battery.
Sub-step 4: If the battery is low but not dead, attempt to jump-start the vehicle using a portable jump starter.
Sub-step 5: Reconnect the battery terminals (positive first, then negative) and ensure they are secure.

3. Battery Replacement (if necessary)

Sub-step 1: Remove the old 12V battery by unscrewing any retaining brackets.
Sub-step 2: Install the new 12V battery, ensuring the positive and negative connections are correctly placed.
Sub-step 3: Reattach any retaining brackets and secure the battery in place.
Sub-step 4: Test the vehicle by attempting to start it again.

4. Check and Reset Vehicle Systems

Sub-step 1: If the vehicle still does not start, perform a reset by holding down the brake pedal and pressing the scroll wheels on the steering wheel until the screen resets.
Sub-step 2: Once the system has rebooted, attempt to start the vehicle again.