2018 Tesla S Won't Start

Troubleshooting Common Issues That Prevent Your 2018 Tesla S from Starting and How to Resolve Them

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Reviewed by
Aisha
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 2018 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 for a 2018 Tesla S that won't start?

When faced with a 2018 Tesla Model S that won't start, it's essential to adopt a methodical diagnostic approach. Begin by checking the battery, as a low or dead battery is often the most common culprit behind starting issues. Ensure that the battery is fully charged and in good condition. Next, inspect the key fob; a malfunctioning key fob or a depleted battery can prevent the vehicle from recognizing your access. Pay attention to any error messages displayed on the screen, as these can offer critical insights into the problem. If the car is connected to a charging cable, verify that it is securely attached and functioning correctly. In some cases, performing a hard reset of the vehicle can resolve minor software glitches that may be hindering the start process. If these initial steps do not yield results, it may be necessary to reach out to Tesla support for further assistance or to schedule a professional inspection. By following this structured approach, you can effectively diagnose and potentially resolve the starting issue with your Tesla Model S.

What are the common problems that could cause a 2018 Tesla S to not start?

When troubleshooting a 2018 Tesla Model S that won't start, it's essential to consider several common problems that could be at play. One of the primary concerns is the battery; a dead battery or faulty connections can easily prevent the vehicle from starting. Additionally, if the car isn't charging properly due to issues with the charging cable or port, this can also lead to starting difficulties. Software glitches are another potential culprit, as updates or bugs in the system may interfere with the starting process. Furthermore, problems with the key fob, such as a depleted battery or synchronization issues, can hinder the car's ability to recognize the key. Mechanical issues, including malfunctions in the motor or drive unit, may also be responsible for starting problems. Lastly, faulty sensors or damaged wiring can disrupt the starting sequence. By systematically addressing these areas, you can effectively diagnose and potentially resolve the starting issues with your Tesla Model S.

How urgent is it to address the starting issue in a 2018 Tesla S that won't start?

When your 2018 Tesla Model S won't start, the urgency to address the issue cannot be overstated. Delaying action can lead to a range of complications, starting with battery concerns. A drained battery not only complicates jump-starting the vehicle but may also necessitate a costly replacement. Additionally, software or firmware glitches can exacerbate starting problems, and timely updates can prevent these issues from escalating into more significant malfunctions. Ignoring the initial signs of trouble may also result in damage to critical components, such as the starter motor, leading to extensive repairs that could have been avoided. Moreover, some starting issues may indicate underlying safety concerns, making it essential to ensure the safety of both the vehicle and its occupants. By addressing the starting issue promptly, you can mitigate risks, save on potential repair costs, and maintain the reliability of your Tesla Model S.

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