2020 Lexus IS300 Speedometer Isn't Working

Common Causes of Speedometer Malfunctions in Your 2020 Lexus IS300 and How to Fix Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
35% chance it's the
Vehicle Speed Sensor (VSS)
0%
28% chance it's the
Speedometer
0%
23% chance it's the
Electrical Issue
0%
14% chance it's
Something else
The most common reasons a 2020 Lexus IS300 speedometer isn't working are the vehicle speed sensor (VSS), a faulty speedometer, or an electrical issue.
  • Vehicle Speed Sensor (VSS): A faulty vehicle speed sensor can result in inaccurate speed readings and erratic transmission shifting.
  • Speedometer: A faulty speed sensor or a broken connection in the speedometer circuit can result in inaccurate speed readings.
  • Electrical Issue: A blown fuse or a short circuit in the wiring can cause various electrical issues in the vehicle's systems.
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 steps should I take to diagnose the non-functioning speedometer in my 2020 Lexus IS300?

To effectively diagnose the non-functioning speedometer in your 2020 Lexus IS300, begin with a systematic approach that prioritizes simpler solutions before delving into more complex diagnostics. Start by checking the fuse associated with the speedometer in the fuse box, as a blown fuse is a common and easily fixable issue. If the fuse is intact, proceed to inspect the speed sensor located on the transmission; ensure it is not damaged or disconnected, as this component is crucial for relaying speed data. Next, examine the wiring connections to both the speed sensor and the speedometer itself, looking for any loose or damaged wires that could disrupt functionality. If these preliminary checks do not resolve the issue, you may need to test the speedometer cluster, which might require specialized diagnostic equipment. Should you find yourself unable to pinpoint the problem, consulting a mechanic or dealership is advisable, as they possess the expertise and tools necessary for accurate diagnosis and repair. By following this structured diagnostic approach, you can efficiently identify and address the cause of your speedometer's malfunction.

What are the common problems that could cause the speedometer to stop working in a 2020 Lexus IS300?

When your speedometer stops working in a 2020 Lexus IS300, it can be frustrating, but understanding the common problems can help you diagnose the issue. One of the primary culprits is a faulty vehicle speed sensor, which is responsible for relaying speed information to the speedometer. If this sensor malfunctions, it can lead to inaccurate readings or a complete failure of the speedometer. Another potential issue is a broken speedometer cable; if this cable is damaged, it will prevent the speedometer from displaying the correct speed. Additionally, a blown fuse in the instrument panel can disrupt the speedometer's functionality, so checking and replacing any blown fuses is a good first step. If these components are functioning correctly, the problem may lie within the instrument cluster itself, which could have a malfunctioning gauge or electrical issue. Lastly, consider the possibility of broader electrical issues, such as wiring problems or faulty connections, which can also affect the speedometer's operation. By systematically checking these common problems, you can effectively troubleshoot and potentially resolve the speedometer issue in your Lexus IS300.

How urgent is it to repair the non-functioning speedometer in a 2020 Lexus IS300?

Repairing a non-functioning speedometer in your 2020 Lexus IS300 is not just a matter of convenience; it is an urgent necessity that directly impacts your safety and legal standing on the road. A malfunctioning speedometer can obscure your awareness of speed, increasing the risk of accidents and making it difficult to adhere to speed limits, which can lead to fines or legal repercussions. Moreover, the speedometer plays a crucial role in the overall performance of your vehicle. Ignoring this issue could result in further complications, potentially affecting other systems within the car. Therefore, addressing the speedometer malfunction promptly is essential to ensure safe driving, compliance with traffic laws, and the optimal functioning of your vehicle.

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2020 Lexus IS300 Speedometer Not Working: Causes & Repairs