2019 Mercedes-Benz SL450 Speedometer Isn't Working

Fix speedometer issues in your 2019 Mercedes-Benz SL450.

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Reviewed by
Devin Cabugcal
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 2019 Mercedes-Benz SL450 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 on a 2019 Mercedes-Benz SL450 isn't working?

When faced with a malfunctioning speedometer in a 2019 Mercedes-Benz SL450, 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. Next, inspect the speed sensor, which plays a crucial role in relaying speed data; any visible damage or malfunction here could be the culprit. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into the vehicle's onboard computer system, helping to identify specific issues. Additionally, examine the wiring and connections linked to the speedometer for any signs of wear, such as loose connections or corrosion, which can disrupt the signal. Finally, testing the speedometer cluster itself will help determine if the problem lies within the cluster or elsewhere in the system. By following these steps, you can effectively narrow down the potential causes of the speedometer issue and take appropriate action to resolve it.

What are the common problems that could cause the speedometer to stop working in a 2019 Mercedes-Benz SL450?

When the speedometer in your 2019 Mercedes-Benz SL450 stops functioning, it can be frustrating, but understanding the common problems can help you troubleshoot effectively. One of the primary culprits is a faulty speed sensor, which is responsible for relaying speed data to the speedometer; if it malfunctions, you may see inaccurate readings or none at all. Another issue could be a broken speedometer cable, which, if damaged, will prevent the speedometer from displaying the correct speed. Additionally, problems within the instrument cluster itself can lead to speedometer failure, as this is where the speedometer is housed. Electrical problems, such as blown fuses or wiring issues, can also disrupt the speedometer's operation, making it essential to check these components. Lastly, a malfunctioning Vehicle Speed Sensor (VSS) can cause similar issues, as it plays a crucial role in sending speed data to the speedometer. By identifying these potential problems, you can take the first steps toward diagnosing and resolving the speedometer issue in your vehicle.

How urgent is it to address the non-functioning speedometer in a 2019 Mercedes-Benz SL450?

Addressing a non-functioning speedometer in a 2019 Mercedes-Benz SL450 is of utmost urgency due to the significant safety risks it poses. Without an accurate speed reading, drivers may unknowingly exceed speed limits, increasing the likelihood of accidents and legal repercussions. Additionally, a malfunctioning speedometer can indicate deeper mechanical issues within the vehicle, which, if left unresolved, could lead to more severe damage and costly repairs. The speedometer plays a critical role in monitoring vehicle performance, and ignoring its failure can compromise the overall functionality of the car. Therefore, it is essential to prioritize the inspection and repair of the speedometer to ensure safe driving conditions, compliance with traffic laws, and the optimal performance of your vehicle.

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Troubleshooting 2019 Mercedes-Benz SL450 Speedometer Issues