how to fix my 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

545 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 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 to prevent shock or short circuits.
•Ensure the vehicle is powered down before performing any repairs.

Symptoms

•No response when pressing the brake pedal or the start button
•Dashboard lights remain off
•No sound from the vehicle
•Key fob or mobile app not connecting
•Error messages displayed on the screen (if any)
•Battery charge indicator shows very low or zero charge

Diagnostic Steps

1
Check the battery level through the Tesla mobile app or by attempting to charge the vehicle.
2
Inspect the key fob battery and replace if necessary.
3
Attempt a hard reset by holding down the two scroll wheels on the steering wheel until the screen reboots.
4
Inspect the 12V battery for voltage using a multimeter; it should read above 12.4 volts.
5
Verify that there are no blown fuses in the vehicle's fuse box related to the power management system.
6
Confirm that the vehicle is in a safe, flat location and not in tow mode.

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
•Replacement 12V battery
•Fuse puller

Parts Required

•Replacement 12V battery
•Fuses (if any are blown)

Related Faults

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Diagnostic Steps

1
Check the battery level through the Tesla mobile app or by attempting to charge the vehicle.
2
Inspect the key fob battery and replace if necessary.
3
Attempt a hard reset by holding down the two scroll wheels on the steering wheel until the screen reboots.
4
Inspect the 12V battery for voltage using a multimeter; it should read above 12.4 volts.
5
Verify that there are no blown fuses in the vehicle's fuse box related to the power management system.
6
Confirm that the vehicle is in a safe, flat location and not in tow mode.

Solution

1. Preparation

Gather tools: multimeter, socket set, replacement 12V battery (if necessary), and a fuse puller.
Ensure the vehicle is parked safely and on a flat surface.

2. Check and Replace the 12V Battery

Locate the 12V Battery:
- Open the front trunk (frunk).
- Remove the cover to access the 12V battery located on the right side.
Test the Battery:
- Use a multimeter to check the voltage of the 12V battery.
- If it reads below 12.4 volts, proceed to replace it.
Remove the Old Battery:
- Disconnect the negative terminal first, followed by the positive terminal.
- Remove any securing brackets and lift out the old battery.
Install the New Battery:
- Place the new 12V battery into the compartment.
- Reconnect the positive terminal first, followed by the negative terminal.
- Ensure all connections are tight and secure.

3. Check Fuses

Locate the Fuse Box:
- Refer to the owner’s manual for the exact location of the fuse box.
Inspect Fuses:
- Remove the fuses related to the power management system using a fuse puller.
- Check if any fuses are blown; replace with the same amperage rating if necessary.
Reassemble:
- Reinsert fuses and cover the fuse box.