2018 Subaru WRX Speedometer Isn't Working

Diagnosing the Causes of a Non-Functional Speedometer in Your 2018 Subaru WRX and How to Fix It

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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 2018 Subaru WRX 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 isn't working on a 2018 Subaru WRX?

When faced with a malfunctioning speedometer in your 2018 Subaru WRX, it's crucial to adopt a systematic diagnostic approach. Start by checking the speed sensor, as it plays a vital role in relaying speed data to the speedometer. Look for any visible damage or loose connections that could disrupt its function. Next, inspect the wiring linked to the speed sensor; damaged or corroded wires can lead to signal loss. Don’t overlook the importance of the fuse associated with the speedometer; a blown fuse can easily halt its operation, so ensure it’s in good condition. If these initial checks don’t resolve the issue, proceed to test the Vehicle Speed Sensor (VSS) itself, as a faulty VSS is a common culprit behind speedometer failures. Finally, utilizing a diagnostic scan tool can provide valuable insights by revealing any error codes related to the speedometer or speed sensor, helping you pinpoint the exact issue. By following these steps, you can effectively troubleshoot and potentially resolve the speedometer problem on your Subaru WRX.

What are the common problems that could cause the speedometer to stop working in a 2018 Subaru WRX?

When your 2018 Subaru WRX speedometer stops working, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is a faulty vehicle speed sensor, which is responsible for relaying speed information to the speedometer; if it malfunctions, you may experience inaccurate readings or a complete failure. Another potential issue is a broken speedometer cable, which can disrupt the connection needed for the speedometer to function properly. Additionally, a blown fuse in the instrument cluster can lead to a non-responsive speedometer, so checking the fuses is a good first step. Problems within the instrument cluster itself, such as wiring issues or malfunctioning gauges, can also prevent the speedometer from working. Lastly, inspect the wiring connected to the speedometer, as damaged or faulty wiring can interrupt the signal. By identifying these common problems, you can take the necessary steps to troubleshoot and potentially resolve the speedometer issue in your WRX.

How urgent is it to address the non-functioning speedometer in a 2018 Subaru WRX?

Addressing a non-functioning speedometer in your 2018 Subaru WRX is not just a matter of convenience; it is a pressing issue that requires immediate attention. The speedometer plays a critical role in ensuring safe driving by providing accurate speed readings, which are essential for adhering to speed limits and avoiding legal repercussions. Driving without a functioning speedometer can lead to unintentional speeding, resulting in fines or even more severe penalties, such as license suspension. Moreover, the safety of both the driver and others on the road is at stake; without accurate speed information, you may find it challenging to make appropriate speed adjustments, increasing the risk of accidents. Additionally, the speedometer is linked to various vehicle systems, and neglecting this issue could lead to further complications that may affect your Subaru's overall performance and drivability. Lastly, if you plan to sell your vehicle in the future, a non-functioning speedometer can significantly diminish its resale value, as potential buyers often look for well-maintained vehicles. Therefore, it is crucial to prioritize the repair of your speedometer to ensure compliance with the law, maintain safety, preserve vehicle performance, and protect your investment.

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Common Speedometer Issues in 2018 Subaru WRX & Solutions