why does my Tesla Model 3 Original (2017-2023) keyless entry stop working

Tesla Model 3 Highland (2024-present)

Error Codes

30 minutes - 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

468 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

30 minutes - 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in a safe location while performing diagnostics and repairs.
•Avoid touching any sensitive electronic components within the vehicle.

Symptoms

•Key fob not detected by the vehicle
•Unable to unlock doors with the key fob
•Keyless entry feature intermittently working
•Vehicle does not respond when key fob is nearby
•"Key not detected" message displayed on the dashboard

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Ensure the key fob is within the appropriate range of the vehicle.
3
Verify that the vehicle's software is up to date through the Tesla app.
4
Inspect the key fob for physical damage or wear.
5
Test the keyless entry with a spare key fob (if available).
6
Scan the vehicle for any fault codes using a diagnostic tool.

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

•Multimeter
•Small flathead screwdriver or plastic prying tool

Parts Required

•CR2032 battery

Related Faults

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Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Ensure the key fob is within the appropriate range of the vehicle.
3
Verify that the vehicle's software is up to date through the Tesla app.
4
Inspect the key fob for physical damage or wear.
5
Test the keyless entry with a spare key fob (if available).
6
Scan the vehicle for any fault codes using a diagnostic tool.

Solution

1. Preparation

Gather tools: multimeter, spare key fob (if available).
Ensure the vehicle is parked in a well-lit area for visibility.
Disconnect the vehicle from charging.

2. Replace Key Fob Battery

Remove the Key Fob Cover
- Use a small flathead screwdriver or a plastic prying tool to carefully open the key fob case.
- Be cautious not to damage the clips or the casing.
Replace the Battery
- Remove the old battery (typically a CR2032).
- Insert a new battery, ensuring the positive side is facing up.
Reassemble the Key Fob
- Snap the key fob cover back together securely.
- Test the key fob to see if it works.

3. Reset Keyless Entry System

Access Vehicle Settings
- Sit inside the vehicle and power it on.
- Navigate to the "Settings" menu on the touchscreen.
Remove and Re-add Key Fob
- Go to "Locks" > "Key Fob" on the touchscreen.
- Select "Remove Key" for the malfunctioning key fob.
- Follow the prompts to re-add the key fob by placing it close to the center console.