2020 Lexus RX350L Speedometer Isn't Working

Troubleshooting Common Issues with the Speedometer in Your 2020 Lexus RX350L 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 RX350L 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 are the initial diagnostic steps to take when the speedometer of a 2020 Lexus RX350L isn't working?

When faced with a malfunctioning speedometer in a 2020 Lexus RX350L, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the speedometer in the vehicle's fuse box, as a blown fuse is a common and easily fixable issue. If the fuse is intact, the next step is to inspect the speed sensor, which plays a crucial role in relaying speed data to the speedometer; any visible damage or signs of malfunction here should be addressed. Utilizing an OBD-II scanner can further aid in diagnosing the problem by revealing any error codes linked to the speedometer or speed sensor, providing valuable insights into the underlying issue. Additionally, examining the wiring and connections for any loose or damaged components is vital, as these can disrupt the signal necessary for the speedometer to function correctly. If all else fails, testing the speedometer cluster itself may be required to determine if the unit is faulty and needs repair or replacement. By following these steps, you can effectively troubleshoot and potentially resolve the speedometer issue in your Lexus RX350L.

What are the common problems that could cause the speedometer to stop working in a 2020 Lexus RX350L?

When troubleshooting a non-functioning speedometer in a 2020 Lexus RX350L, it's important to consider several common problems that could be at play. 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, which can disrupt the connection necessary for the speedometer to display the correct speed. Additionally, a blown fuse in the instrument panel may also cause the speedometer to stop working altogether, as electrical components rely on fuses for proper operation. Furthermore, problems within the instrument cluster itself, such as a malfunctioning gauge or electrical issues, can prevent the speedometer from functioning correctly. Lastly, general electrical problems, including wiring issues, can significantly impact the speedometer's performance. For a DIY enthusiast, understanding these common problems is crucial for effective troubleshooting and repair, but it is advisable to consult a qualified mechanic for a thorough diagnosis to ensure safe driving conditions.

How urgent is it to address the malfunctioning speedometer in a 2020 Lexus RX350L?

When dealing with a malfunctioning speedometer in a 2020 Lexus RX350L, it is crucial to recognize the urgency of the situation. A faulty speedometer not only compromises your ability to accurately gauge your speed, which can lead to unsafe driving conditions, but it also poses significant legal risks. If you are pulled over and found to be speeding due to inaccurate readings, you could face fines or other legal repercussions. Moreover, neglecting this issue can lead to further complications within your vehicle's systems, potentially resulting in more costly repairs down the line. Therefore, it is essential to address any speedometer malfunctions promptly, ensuring both your safety on the road and the optimal performance of your vehicle. Taking immediate action can prevent minor issues from escalating into major problems, making it imperative for DIY enthusiasts to prioritize this repair.

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