2020 Tesla S Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2020 Tesla Model S: Common Causes and Solutions

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Emissions System
0%
60% chance it's
Something else
The most common reasons a 2020 Tesla S has a check engine light are an emissions system component, a sensor, or a catalytic converter.
  • Emissions System: A faulty emissions system component, such as an oxygen sensor or EGR valve, can lead to increased emissions and trigger the check engine light.
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.

How much does it cost to fix a 2020 Tesla S has a check engine light?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

What are the initial diagnostic steps to take for a check engine light on a 2020 Tesla S?

When faced with a check engine light on your 2020 Tesla Model S, start by assessing any immediate issues that may be affecting your vehicle's performance. Listen for unusual noises, check for strange odors, and monitor how the car drives. A common yet often overlooked culprit is the gas cap; ensure it is securely tightened, as a loose cap can easily trigger the warning light. Next, take a moment to inspect your dashboard for any additional alerts or warning lights that could provide further context about the issue. If the light persists, using an OBD-II scanner can be invaluable; this tool allows you to retrieve error codes that pinpoint the specific problem. Additionally, consulting your owner's manual can help you interpret these codes and suggest appropriate actions. If these steps do not resolve the issue or if you feel uncertain about the diagnosis, it’s wise to reach out to Tesla Service for professional assistance. By following this methodical approach, you can effectively troubleshoot the check engine light and determine the best course of action.

What are the common problems that could cause the check engine light to activate in a 2020 Tesla S?

When the check engine light illuminates in a 2020 Tesla Model S, it can be concerning for any owner, especially those inclined to tackle issues themselves. Common problems that may trigger this warning include battery-related issues, such as a malfunctioning battery pack or charging system, which can often be diagnosed by checking the battery status through the vehicle's interface. Additionally, electric motor or drivetrain component failures may present themselves, and while these are more complex, visual inspections can sometimes reveal loose connections or signs of wear. Software glitches are another frequent culprit; performing a software update or reset can often resolve these issues. Sensor malfunctions, particularly with the vehicle's monitoring systems, can also lead to the check engine light activating, and these may be checked using diagnostic tools available for DIY enthusiasts. Charging port issues can affect charging efficiency, so inspecting the port for debris or damage is advisable. Lastly, cooling system problems can impact performance, and checking coolant levels or for leaks can be a straightforward task. While some of these issues can be addressed at home, it is crucial to remember that persistent problems should be evaluated by a certified Tesla technician to ensure safety and optimal vehicle performance.

How urgent is it to address the check engine light on a 2020 Tesla S?

When the check engine light illuminates on your 2020 Tesla Model S, it is crucial to act swiftly. This warning light is not merely a nuisance; it indicates that there may be underlying issues with your vehicle's systems that require immediate attention. Ignoring this signal can lead to more severe complications, including costly repairs and potential safety hazards. Given that Tesla vehicles are heavily reliant on sophisticated electronic systems and sensors, timely diagnosis and resolution of any issues are vital for maintaining optimal performance. While some check engine light triggers may be minor, it is advisable to utilize the onboard diagnostic tools available in your Tesla to assess the situation accurately. By addressing the check engine light promptly, you not only safeguard your vehicle's functionality but also enhance your safety on the road, ensuring a longer lifespan for your Tesla Model S.

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