how to fix Tesla Model 3 Original (2017-2023) that won’t start

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

580 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 symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in "Park" mode before performing repairs.
•Disconnect the 12V battery before working on electrical connections to prevent short circuits.

Symptoms

•No response when pressing the start button
•"Powering On" message displayed indefinitely
•Dashboard lights dim or do not illuminate
•Key fob or mobile app fails to unlock or start the vehicle
•Battery charge level is low or depleted
•Error messages related to battery or electrical system

Diagnostic Steps

1
Check the charge level of the 12V battery using the vehicle's display or mobile app.
2
Inspect the key fob battery and replace it if necessary.
3
Attempt to perform a soft reset by holding down the scroll wheels on the steering wheel.
4
Verify if any error messages are displayed on the touchscreen.
5
Use a diagnostic tool to scan for any stored error codes related to the battery or electrical systems.
6
Inspect the main battery pack for damage or signs of failure.

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

•Diagnostic scanner
•Multimeter
•Flathead screwdriver
•Phillips screwdriver

Parts Required

•New 12V battery
•Key fob battery (CR2032)

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Diagnostic Steps

1
Check the charge level of the 12V battery using the vehicle's display or mobile app.
2
Inspect the key fob battery and replace it if necessary.
3
Attempt to perform a soft reset by holding down the scroll wheels on the steering wheel.
4
Verify if any error messages are displayed on the touchscreen.
5
Use a diagnostic tool to scan for any stored error codes related to the battery or electrical systems.
6
Inspect the main battery pack for damage or signs of failure.

Solution

1. Preparation

Tools Required: Diagnostic scanner, multimeter, flathead screwdriver, Phillips screwdriver.
Ensure the vehicle is in a safe location and powered off.

2. Inspect and Replace 12V Battery

Locate the 12V Battery: Open the front trunk (frunk) and identify the 12V battery compartment.
Disconnect the Battery: Use a 10mm socket to remove the negative terminal first, followed by the positive terminal.
Remove the Battery: Unscrew any retaining brackets and lift the battery out of the compartment.
Install New Battery: Place the new 12V battery in the compartment and secure it with the retaining bracket.
Reconnect the Battery: Attach the positive terminal first, then the negative terminal. Ensure connections are tight.

3. Reset the Vehicle

Perform a Soft Reset: Press and hold both scroll wheels on the steering wheel until the touchscreen reboots.
Check for Functionality: After the reset, check if the vehicle responds to the start button.

4. Test Key Fob

Replace Key Fob Battery: Use a flathead screwdriver to gently pry open the key fob and replace the CR2032 battery.
Reprogram Key Fob: Follow the Tesla app instructions to reprogram the key fob if needed.

5. Inspect Electrical Connections

Check Wiring and Connectors: Inspect all visible wiring for wear or damage, especially near the battery and electrical components.
Reconnect Loose Connections: Tighten any loose connectors or screws.