how to fix my Tesla Model 3 Original (2017-2023) when the key fob isn't working

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

501 words

Problem Statement

Learn how to diagnose and fix key fob issues for 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' before performing any procedures related to the key fob.

Symptoms

•Key fob does not unlock or lock the doors
•Key fob does not start the vehicle
•Indicator lights on the key fob do not illuminate
•Messages on the vehicle’s display indicating a key fob issue
•Inability to connect to the Tesla app for remote functions

Diagnostic Steps

1
Check the key fob battery level using a multimeter.
2
Inspect the key fob for physical damage or water intrusion.
3
Attempt to reprogram the key fob through the vehicle’s settings.
4
Verify if other key fobs (if available) are functioning properly.
5
Check the vehicle's software for updates that may affect key fob functionality.
6
Examine the vehicle's keyless entry antenna for damage or interference.

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 screwdriver
•Tesla Model 3 touchscreen interface
•Trim removal tools
•Multimeter

Parts Required

•CR2032 battery (or appropriate replacement battery for key fob)
•Keyless entry antenna (if damaged)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the key fob battery level using a multimeter.
2
Inspect the key fob for physical damage or water intrusion.
3
Attempt to reprogram the key fob through the vehicle’s settings.
4
Verify if other key fobs (if available) are functioning properly.
5
Check the vehicle's software for updates that may affect key fob functionality.
6
Examine the vehicle's keyless entry antenna for damage or interference.

Solution

1. Battery Replacement

Sub-steps:
1. Use a small screwdriver to open the key fob casing.
2. Remove the old battery (usually a CR2032) carefully.
3. Insert a new battery, ensuring the positive side is facing up.
4. Reassemble the key fob casing securely.
Tools Required:
- Small screwdriver

2. Reprogram Key Fob

Sub-steps:
1. Enter the vehicle and ensure it is in "Park."
2. Go to the "Controls" menu on the touchscreen.
3. Select "Locks," then tap "Key Fob" to add a new key fob.
4. Follow the on-screen prompts to complete the pairing process.
Tools Required:
- Tesla Model 3 touchscreen interface

3. Check for Software Updates

Sub-steps:
1. On the touchscreen, navigate to "Software" under "Controls."
2. Check for any available updates and follow the prompts to install.
3. Restart the vehicle after the update is complete.
Tools Required:
- Tesla Model 3 touchscreen interface

4. Inspect Keyless Entry Antenna

Sub-steps:
1. Remove the rear trunk lining to access the keyless entry antenna.
2. Inspect the antenna for damage or loose connections.
3. If damaged, replace the antenna with a new one.
Tools Required:
- Trim removal tools
- Screwdriver set