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my Tesla Model 3 Original (2017-2023) is showing a “Key Not Detected” warning, how to fix it? - Tesla Model 3
Home/Cars/Tesla/Model 3/Highland (2024-present)/my Tesla Model 3 Original (2017-2023) is showing a “Key Not Detected” warning, how to fix it?

my Tesla Model 3 Original (2017-2023) is showing a “Key Not Detected” warning, how to fix it?

Tesla Model 3 Highland (2024-present)

Error Codes
30 minutes
Time
medium
Difficulty
high
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
516 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to resolve the 'Key Not Detected' issue in Tesla Model 3 (2017-2023). Step-by-step guide for diagnostics and key fob battery replacement.

Affected Component
Electrical
Estimated Time
30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Handle the key fob components carefully to prevent damage.

Symptoms

  • •Key Not Detected warning displayed on the screen
  • •Vehicle not responding to key fob commands
  • •Inability to start the vehicle
  • •Key fob may not unlock or lock the doors
  • •Reduced range of key fob functionality

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

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
  • •Cloth for cleaning

Parts Required

  • •Key fob battery (CR2032)

Additional Information

Affected Component
Electrical
Estimated Time
30 minutes
Difficulty
medium
Severity
high
Tools Required
2 items
Parts Required
1 item

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Solution
1. Preparation
  • Ensure the vehicle is in a safe, well-lit area.
  • Gather tools: small screwdriver (if needed), new key fob battery (CR2032), and a cloth for cleaning.
2. Replace Key Fob Battery

  1. Open the Key Fob:

    • Use a small screwdriver or a prying tool to carefully open the key fob casing.
    • Be gentle to avoid damaging the casing.

  2. Remove Old Battery:

    • Take note of the battery orientation (positive and negative sides).
    • Remove the old battery from the key fob.

  3. Install New Battery:

    • Insert the new battery (CR2032) into the key fob, ensuring it is oriented correctly.
    • Press down gently to ensure the battery is seated properly.

  4. Close the Key Fob:

    • Align the two halves of the key fob and press them together until they click into place.
    • Ensure there are no gaps in the casing.
3. Reprogram the Key Fob (if necessary)

  1. Enter the Vehicle:

    • Use the physical key (if applicable) to enter the vehicle.

  2. Access the Key Fob Settings:

    • On the vehicle's touchscreen, navigate to 'Controls' > 'Locks'.

  3. Add Key Fob:

    • Select ‘Add Key Fob’ and follow the on-screen instructions to reprogram the key fob.
    • Place the key fob in the designated area (typically near the center console) as prompted.