my Tesla Model 3 Original (2017-2023) engine won't start just clicks what could it be

Tesla Model 3 Highland (2024-present)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

3 min read

583 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 3 (2017-2023) characterized by clicking sounds. Step-by-step guide included.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical components to avoid shock
•Allow the vehicle to sit for a few minutes after disconnecting the battery before starting work

Symptoms

•Clicking noise when the start button is pressed
•Dashboard lights flicker or dim
•No engine cranking sound
•Power to accessories (radio, lights) is present but no starting
•Battery warning light illuminated on the dashboard
•Potential error messages related to battery or power system

Diagnostic Steps

1
Verify the state of the 12V battery using a multimeter (should be around 12.6 volts)
2
Check for any error codes using the Tesla diagnostic system or OBD-II scanner
3
Inspect the connections at the 12V battery for corrosion or loose connections
4
Test the main battery pack voltage to ensure it is adequately charged
5
Examine the contactors and fuses related to the battery and starting system for faults
6
Assess the condition of the key fob and ensure it is properly paired with the 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

•Multimeter
•Socket set
•Wrench set
•Torque wrench
•Battery terminal cleaner

Parts Required

•New 12V battery (ensure compatibility with Tesla Model 3)
•Replacement fuses (if necessary)

Related Faults

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Diagnostic Steps

1
Verify the state of the 12V battery using a multimeter (should be around 12.6 volts)
2
Check for any error codes using the Tesla diagnostic system or OBD-II scanner
3
Inspect the connections at the 12V battery for corrosion or loose connections
4
Test the main battery pack voltage to ensure it is adequately charged
5
Examine the contactors and fuses related to the battery and starting system for faults
6
Assess the condition of the key fob and ensure it is properly paired with the vehicle

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked in a safe, well-ventilated area.
Disconnect the 12V battery to prevent electrical shock.

2. Check and Replace the 12V Battery

Tools Required:
- Socket set (10mm socket)
- Multimeter
- Battery terminal cleaner
Instructions:
1. Remove the frunk cover by unscrewing the necessary fasteners.
2. Disconnect the negative terminal of the 12V battery first, followed by the positive terminal.
3. Remove the battery hold-down bracket.
4. Carefully lift out the old 12V battery.
5. Clean the battery terminals with a terminal cleaner.
6. Install the new 12V battery in reverse order:
  - Place the new battery in the tray.
  - Reattach the hold-down bracket and secure it.
  - Connect the positive terminal first, followed by the negative terminal.
7. Replace the frunk cover.

3. Inspect and Repair Power Connections

Tools Required:
- Wrench set
- Torque wrench
Instructions:
1. Inspect all connections leading to the 12V battery and main battery pack for any signs of wear or corrosion.
2. Tighten any loose connections to the appropriate torque specifications (generally 10-15 ft-lbs).
3. If corrosion is present, clean thoroughly or replace affected wiring.

4. Test Contactors and Fuses

Tools Required:
- Multimeter
Instructions:
1. Locate the fuse box and inspect for any blown fuses.
2. Use a multimeter to check continuity on the contactors that connect the main battery to the vehicle's power system.
3. Replace any blown fuses and ensure contactors are functioning correctly.