how to fix the Tesla Model 3 Original (2017-2023) keyless entry not working

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

489 words

Problem Statement

Learn how to diagnose and fix keyless entry issues in Tesla Model 3 (2017-2023). 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

•Ensure the vehicle is in 'Park' mode before attempting any repairs or resets.

Symptoms

•Key fob does not unlock the doors.
•Mobile app fails to connect to the vehicle for remote access.
•Keyless entry notification displayed on the dashboard.
•Vehicle does not respond to proximity detection.
•Other electronic features (e.g., trunk release) are unresponsive.

Diagnostic Steps

1
Check the battery level of the key fob and replace if low.
2
Inspect the key fob for physical damage or wear.
3
Verify that the mobile app is connected to the vehicle.
4
Attempt to reset the key fob connection by removing it from the vehicle's settings and re-adding it.
5
Scan the vehicle for any error codes using Tesla diagnostics if available.
6
Ensure all vehicle firmware is up to date.

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

•OBD-II scanner (for Tesla)
•Small screwdriver

Parts Required

•CR2032 key fob battery (if replacement is needed)

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Diagnostic Steps

1
Check the battery level of the key fob and replace if low.
2
Inspect the key fob for physical damage or wear.
3
Verify that the mobile app is connected to the vehicle.
4
Attempt to reset the key fob connection by removing it from the vehicle's settings and re-adding it.
5
Scan the vehicle for any error codes using Tesla diagnostics if available.
6
Ensure all vehicle firmware is up to date.

Solution

1. Preparation

Gather necessary tools: OBD-II scanner (for Tesla), small screwdriver, and replacement battery (if needed).
Ensure the vehicle is parked in a safe area and that all electronic systems are powered down.

2. Replace Key Fob Battery

Sub-steps:
1. Use a small screwdriver to gently pry open the key fob casing.
2. Remove the old battery (typically a CR2032) and dispose of it properly.
3. Insert the new battery, ensuring the positive (+) side is facing up.
4. Reassemble the key fob casing securely.

3. Reset Key Fob Connection

Sub-steps:
1. Open the Tesla app on your smartphone and navigate to 'Controls.'
2. Select 'Keys' and find the existing key fob entry.
3. Remove the key fob from the list.
4. Place the key fob in the center console area of the vehicle to initiate pairing.
5. Follow on-screen prompts to add the key fob back to the system.

4. Update Vehicle Firmware

Sub-steps:
1. Connect the vehicle to Wi-Fi.
2. Go to 'Software' in the vehicle’s touchscreen menu.
3. Check for available updates and install any pending updates.
4. Restart the vehicle after the update completes.