2021 Tesla S Won't Start

Troubleshooting Common Issues That Prevent Your 2021 Tesla S from Starting and How to Resolve Them

Find Repair Location
Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
38% chance it's the
Battery
0%
27% chance it's the
Alternator
0%
20% chance it's the
Starter
0%
15% chance it's
Something else
The most common reasons a 2021 Tesla S won't start are a dead battery, an alternator problem, or failed starter.
  • Battery: A weak or failing battery can result in difficulty starting the engine and electrical system malfunctions.
  • Alternator: A failing alternator can result in insufficient electrical power, leading to battery drain and electrical system malfunctions.
  • Starter: A faulty starter motor or a weak battery can prevent the engine from cranking properly, leading to starting issues.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the initial diagnostic steps to take when a 2021 Tesla S won't start?

When your 2021 Tesla Model S refuses to start, the first step is to check the battery, as a low or dead battery is a common culprit. Ensure that the battery is fully charged and that all connections are secure. Next, inspect the key fob; a malfunctioning key fob can prevent the vehicle from recognizing your attempt to start it, so verify that the key fob battery is working properly. If both the battery and key fob are in good condition, try restarting the car by pressing the brake pedal and holding it while you press the power button, as this can sometimes reset the system and resolve minor glitches. Additionally, keep an eye out for any error messages on the dashboard display, as these can provide crucial insights into what might be wrong. If these initial steps do not resolve the issue, it may be time to reach out to Tesla support for further assistance, as they can offer remote diagnostics and more advanced troubleshooting options. By following this structured approach, you can efficiently diagnose and potentially fix the starting issue with your Tesla Model S.

What are the common problems that could cause a 2021 Tesla S to not start?

When a 2021 Tesla Model S fails to start, several common problems may be at play, and understanding these can help you diagnose the issue. One of the primary concerns is the battery; a drained or faulty battery can easily prevent the vehicle from starting. It's essential to check the battery's charge level and connections to ensure they are secure and functioning properly. Additionally, the key fob plays a crucial role in starting the vehicle; if the key fob battery is low or the fob itself is malfunctioning, it may not communicate with the car, leading to starting issues. Software glitches can also be a culprit, so ensuring that the vehicle's software is up to date can help resolve any underlying issues. Furthermore, if the Tesla is not sufficiently charged, it simply won't start, making it vital to check the charge level before troubleshooting further. Lastly, inspecting various components such as the starter, charging port, and other electrical systems for faults can provide insight into more complex problems. By systematically addressing these areas, Tesla owners can effectively troubleshoot and potentially resolve starting issues on their own.

How urgent is it to address the starting issue in a 2021 Tesla S that won't start?

When your 2021 Tesla Model S fails to start, it is crucial to act swiftly to mitigate any safety risks and prevent further complications. A non-starting vehicle can create hazardous situations, particularly if it occurs unexpectedly while on the road or in a critical moment when you need to move the car quickly. Additionally, neglecting this issue can lead to more severe damage to the vehicle's electrical or mechanical systems, resulting in costly repairs that could have been avoided with prompt attention. Timely intervention not only ensures your vehicle remains reliable for daily use but also facilitates accurate diagnostics, allowing you to identify the root cause of the problem efficiently. Therefore, addressing the starting issue without delay is essential for maintaining the safety and functionality of your Tesla Model S.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

Troubleshooting 2021 Tesla S Won't Start Issues | RepairPal