how to fix my Tesla Model 3 Original (2017-2023) key fob not unlocking the car

Tesla Model 3 Highland (2024-present)

Error Codes

30-60 minutes

Time

medium

Difficulty

medium

Severity

3 min read

439 words

Problem Statement

Learn how to fix your Tesla Model 3 key fob not unlocking the car. Step-by-step guide with diagnostic steps, tools required, and repair instructions.

Affected Component

Electrical

Estimated Time

30-60 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is off before working on the key fob.

Symptoms

•Key fob not responding to unlock command
•No LED light activation on the key fob when buttons are pressed
•Vehicle not recognizing the key fob when in proximity
•Battery warning message displayed on the vehicle screen
•Inability to start the vehicle using the key fob

Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting for corrosion or damage.
2
Replace the battery in the key fob with a new CR2032 battery, ensuring correct polarity.
3
Re-sync the key fob with the vehicle by following the re-pairing procedure in the Tesla manual.
4
Inspect the vehicle's key fob antenna for any damage or obstructions.
5
Use the Tesla app to see if the vehicle can be unlocked via mobile access as an alternative.

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 flathead screwdriver

Parts Required

•CR2032 battery

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 by opening the fob and inspecting for corrosion or damage.
2
Replace the battery in the key fob with a new CR2032 battery, ensuring correct polarity.
3
Re-sync the key fob with the vehicle by following the re-pairing procedure in the Tesla manual.
4
Inspect the vehicle's key fob antenna for any damage or obstructions.
5
Use the Tesla app to see if the vehicle can be unlocked via mobile access as an alternative.

Solution

1. Preparation

Gather necessary tools: small flathead screwdriver, new CR2032 battery, and a clean workspace.
Ensure the vehicle is parked and turned off for safety.

2. Open the Key Fob

Use the small flathead screwdriver to gently pry open the key fob casing.
Take care not to damage the plastic casing or internal components.

3. Replace the Battery

Remove the old CR2032 battery from the key fob.
Insert the new CR2032 battery, ensuring the positive (+) side faces up.
Reassemble the key fob casing securely.

4. Re-sync the Key Fob

Enter the vehicle and go to the 'Controls' section on the touchscreen.
Select 'Locks' and then choose 'Add Key Fob.'
Follow the prompts to sync the new key fob with the vehicle.

5. Test the Key Fob

Attempt to unlock the vehicle using the key fob.
Check if the LED light on the key fob activates when the buttons are pressed.