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

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 turn on. 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

•Disconnect the main battery before working on electrical components.
•Always wear safety gloves and goggles when handling batteries.

Symptoms

•No response when pressing the brake pedal or the power button
•Dashboard lights remain off
•No sounds or indicators from the vehicle
•Vehicle Power Off message displayed on the screen
•Unable to unlock the vehicle using the key fob or mobile app

Diagnostic Steps

1
Check the 12V battery voltage using a multimeter.
2
Inspect the main battery for any visible damage or disconnection.
3
Attempt to perform a hard reset by holding down the brake pedal while pressing the two scroll wheels on the steering wheel.
4
Verify that the charging cable is properly connected and that there is power at the outlet.
5
Use the Tesla app to check for any alerts or notifications regarding the vehicle's status.
6
Inspect the fuses related to the power distribution system.

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
•Flathead screwdriver

Parts Required

•Replacement 12V battery (Group 24)

Related Faults

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Diagnostic Steps

1
Check the 12V battery voltage using a multimeter.
2
Inspect the main battery for any visible damage or disconnection.
3
Attempt to perform a hard reset by holding down the brake pedal while pressing the two scroll wheels on the steering wheel.
4
Verify that the charging cable is properly connected and that there is power at the outlet.
5
Use the Tesla app to check for any alerts or notifications regarding the vehicle's status.
6
Inspect the fuses related to the power distribution system.

Solution

1. Preparation

Ensure the vehicle is in a safe, well-ventilated area.
Gather tools: multimeter, socket set, and a flathead screwdriver.
Disconnect the main battery before working on electrical components.

2. Check and Replace the 12V Battery

Locate the 12V Battery: Open the front trunk and find the 12V battery on the left side.
Test Voltage: Use a multimeter to measure the voltage; it should be above 12.4 volts.
Disconnect the Battery: Remove the negative terminal first, followed by the positive terminal.
Replace Battery (if necessary):
- Remove the battery hold-down brackets with a socket set.
- Carefully lift out the old battery and replace it with a new one (consider a Group 24 battery type).
- Reconnect the positive terminal first, followed by the negative terminal.
Recheck System: Ensure all connections are tight and secure.

3. Inspect and Reset the Main Battery

Locate Main Battery Disconnect: Access the battery compartment by removing the cover.
Inspect Connections: Look for loose or corroded connections and tighten as necessary.
Perform Reset: If the vehicle is still unresponsive, disconnect the main battery for 10 minutes, then reconnect it.
Check for Fault Codes: If the vehicle turns on, use the Tesla app or an OBD-II scanner to check for any fault codes.