how to fix a Tesla Model 3 Original (2017-2023) that won't unlock with the key fob

Tesla Model 3 Highland (2024-present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

470 words

Problem Statement

Learn how to fix a Tesla Model 3 key fob that won't unlock the vehicle. Step-by-step guide with diagnostic steps and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Handle the key fob carefully to avoid damaging the internal components.

Symptoms

•Key fob not responding when attempting to unlock the vehicle
•Indicator lights on the key fob not illuminating
•Unable to start the vehicle without manually entering the car
•No response from the vehicle when the key fob is pressed
•Vehicle does not recognize the key fob proximity

Diagnostic Steps

1
Check the battery level of the key fob and replace if necessary.
2
Inspect the key fob for physical damage or water exposure.
3
Verify if the vehicle can be unlocked via the Tesla mobile app.
4
Attempt to unlock the vehicle using the backup key card.
5
Look for any software updates available for the vehicle.
6
Perform a hard reset of the vehicle by holding down the steering wheel buttons.

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 flat-head screwdriver

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Check the battery level of the key fob and replace if necessary.
2
Inspect the key fob for physical damage or water exposure.
3
Verify if the vehicle can be unlocked via the Tesla mobile app.
4
Attempt to unlock the vehicle using the backup key card.
5
Look for any software updates available for the vehicle.
6
Perform a hard reset of the vehicle by holding down the steering wheel buttons.

Solution

1. Key Fob Battery Replacement

Open the Key Fob: Use a small flat-head screwdriver to gently pry open the key fob at the seam.
Replace Battery: Remove the old battery (CR2032) and replace it with a new one, ensuring the positive side is facing up.
Reassemble Key Fob: Snap the key fob back together securely.

2. Reset Key Fob Connection

Enter the Vehicle: Use the key card or the mobile app to gain access to the vehicle.
Access Settings: On the touchscreen, go to 'Controls' > 'Safety & Security'.
Reset Key Fob: Select 'Remove Key Fob' for the one that is not functioning. Then follow the prompts to add the key fob back by placing it on the center console.
Test Functionality: Attempt to unlock the vehicle with the key fob again.

3. Software Update

Check for Updates: On the touchscreen, navigate to 'Controls' > 'Software'.
Install Updates: If an update is available, follow the prompts to install it.
Reboot Vehicle: After updates, perform a hard reset by holding down the two scroll wheels on the steering wheel until the screen reboots.