how can I fix my Tesla Model 3 Original (2017-2023) that won’t unlock remotely

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

586 words

Problem Statement

Learn how to fix the remote unlock issue for Tesla Model 3 (2017-2023). Step-by-step guide on diagnosing and resolving key fob and mobile app problems.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always ensure the vehicle is in 'Park' before performing any maintenance.
•Disconnect the battery only when the vehicle is completely powered down.

Symptoms

•Key fob does not respond when pressing unlock button
•Mobile app shows the vehicle as 'offline'
•Vehicle does not respond to voice commands for unlocking
•No visual or audible feedback when attempting to unlock
•Doors remain locked regardless of attempts to unlock remotely

Diagnostic Steps

1
Ensure the key fob battery is not dead by checking its functionality on another Tesla vehicle.
2
Verify the mobile device has a stable internet connection and is within Bluetooth range of the vehicle.
3
Restart the Tesla mobile app and check for software updates available for the app.
4
Inspect the key fob for physical damage or corrosion at the battery contacts.
5
Check the vehicle’s 12V battery voltage using the built-in diagnostics or an external multimeter.
6
Look for any recent software updates or issues reported in Tesla forums that may relate to remote unlocking functionality.

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
•Socket wrench

Parts Required

•CR2032 key fob battery

Related Faults

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Diagnostic Steps

1
Ensure the key fob battery is not dead by checking its functionality on another Tesla vehicle.
2
Verify the mobile device has a stable internet connection and is within Bluetooth range of the vehicle.
3
Restart the Tesla mobile app and check for software updates available for the app.
4
Inspect the key fob for physical damage or corrosion at the battery contacts.
5
Check the vehicle’s 12V battery voltage using the built-in diagnostics or an external multimeter.
6
Look for any recent software updates or issues reported in Tesla forums that may relate to remote unlocking functionality.

Solution

1. Preparation

Ensure that the vehicle is in a safe and accessible location.
Have a charged key fob, mobile device, and any necessary tools ready.
Tools Required: None specific for this step.

2. Replace Key Fob Battery

Sub-steps:
1. Open the key fob by using a small flat-head screwdriver to pry open the back cover.
2. Remove the old battery (CR2032) and replace it with a new one, ensuring correct polarity (positive side up).
3. Snap the back cover back onto the key fob until it clicks securely.

3. Reset the Vehicle's 12V Battery

Sub-steps:
1. Open the front trunk and locate the 12V battery.
2. Disconnect the negative terminal using a socket wrench.
3. Wait for 5 minutes, then reconnect the negative terminal and ensure it is secured tightly.
4. Close the front trunk and check if the unlocking functionality is restored.

4. Re-pair the Key Fob

Sub-steps:
1. Enter the vehicle and ensure it is powered on.
2. Go to the "Controls" menu on the touchscreen display.
3. Select "Locks" and then "Add Key Fob."
4. Follow the on-screen instructions to complete the pairing process.

5. Update Software

Sub-steps:
1. Connect the vehicle to a Wi-Fi network from the touchscreen.
2. Go to "Software" in the "Controls" menu.
3. Check for updates and install any available software updates.
4. Restart the vehicle after the update is complete.