my Tesla Model 3 Original (2017-2023) won’t unlock, what should I do?

Tesla Model 3 Highland (2024-present)

Error Codes

1 hour

Time

medium

Difficulty

high

Severity

3 min read

463 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 troubleshoot and fix the unlocking issue in your Tesla Model 3 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Handle the key fob carefully to avoid damage during battery replacement.
•Ensure the vehicle is in a safe environment while performing resets or updates.

Symptoms

•Key fob not responsive
•Mobile app unable to unlock the car
•No response from the door handles when touched
•Check for any error messages on the vehicle display
•Battery warning on the key fob (if applicable)

Diagnostic Steps

1
Check the battery level of the key fob.
2
Attempt to unlock the vehicle using the Tesla mobile app.
3
Inspect the key fob for physical damage or water exposure.
4
Verify if the car is in a secure area, as interference from nearby devices can affect unlocking.
5
Ensure that the vehicle is charged and not in a sleep mode that prevents unlocking.
6
Attempt to unlock the vehicle with the backup key card.

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

•Small Phillips screwdriver
•Multimeter (optional, for checking key fob battery)
•Backup key card

Parts Required

•CR2032 battery (for key fob, if applicable)

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Diagnostic Steps

1
Check the battery level of the key fob.
2
Attempt to unlock the vehicle using the Tesla mobile app.
3
Inspect the key fob for physical damage or water exposure.
4
Verify if the car is in a secure area, as interference from nearby devices can affect unlocking.
5
Ensure that the vehicle is charged and not in a sleep mode that prevents unlocking.
6
Attempt to unlock the vehicle with the backup key card.

Solution

1. Preparation

Gather necessary tools: mobile phone with the Tesla app, backup key card, and a multimeter (if checking battery).
Ensure the vehicle is in a safe area with minimal electronic interference.

2. Replace Key Fob Battery

Tools Required: Small Phillips screwdriver, new CR2032 battery.
Steps:
1. Open the key fob using the small screwdriver to remove the back cover.
2. Replace the old battery with a new CR2032 battery, ensuring correct polarity.
3. Reassemble the key fob and test for functionality.

3. Reset Vehicle Settings

Steps:
1. Sit inside the vehicle and press both scroll wheels on the steering wheel until the screen reboots.
2. Wait for the vehicle to reboot completely.
3. Test the key fob and mobile app to see if the vehicle unlocks.

4. Check Vehicle Firmware

Steps:
1. Open the Tesla app and navigate to the settings.
2. Check for any firmware updates and follow prompts to ensure the vehicle is fully updated.
3. After updating, restart the vehicle and test unlocking procedures again.