2018 Subaru WRX Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2018 Subaru WRX and How to Fix Them

Find Repair Location
Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2018 Subaru WRX cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty or malfunctioning sensor can lead to incorrect readings, causing issues with engine performance or other systems relying on accurate data.
  • Control Module: A faulty control module can lead to erratic vehicle behavior or failure of various electronic systems due to improper signal processing.
  • Throttle: A faulty throttle body or a defective accelerator pedal position sensor may be causing inconsistent throttle response.
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 troubleshoot the non-functioning cruise control in a 2018 Subaru WRX?

When troubleshooting the non-functioning cruise control in your 2018 Subaru WRX, start with the simplest solutions before moving on to more complex diagnostics. Begin by checking the cruise control fuse in the fuse box; a blown fuse can easily disrupt the system. Next, ensure that the cruise control settings are correctly configured and activated, as incorrect settings can prevent engagement. If these initial checks do not resolve the issue, use a diagnostic scanner to look for any error codes that may indicate a deeper problem within the vehicle's onboard computer. Additionally, inspect the cruise control buttons on the steering wheel for any signs of damage or malfunction, as these can hinder functionality. Finally, examine the brake pedal switch, as a stuck or faulty switch can also prevent the cruise control from engaging. By following this structured approach, you can effectively diagnose and potentially resolve the cruise control issue in your Subaru WRX.

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

When troubleshooting cruise control issues in a 2018 Subaru WRX, it's essential to consider several common problems that could be at play. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging if it fails to signal that the brake pedal is pressed. Additionally, speed sensor issues can lead to inaccurate readings, causing the system to malfunction or disengage unexpectedly. A blown fuse in the cruise control circuit can also render the feature inoperative, making it crucial to check and replace any damaged fuses. Furthermore, a malfunction in the throttle control system, such as a faulty throttle position sensor, can disrupt the cruise control's ability to maintain speed. Lastly, vacuum leaks in the engine can interfere with the necessary vacuum pressure for the cruise control system to function correctly. By systematically addressing these potential issues, you can effectively diagnose and resolve the cruise control problems in your Subaru WRX.

How urgent is it to address the malfunctioning cruise control in my 2018 Subaru WRX?

When it comes to the malfunctioning cruise control in your 2018 Subaru WRX, the urgency of addressing the issue cannot be overstated. A faulty cruise control system can lead to unpredictable vehicle behavior, such as sudden acceleration or deceleration, which poses a significant safety risk not only to you but also to other road users. Promptly addressing this malfunction is crucial to ensure the safe operation of your vehicle, as neglecting the issue could result in further complications, including damage to other vehicle systems that may lead to more expensive repairs down the line. Therefore, it is highly advisable to have the cruise control system inspected and repaired by a qualified mechanic or authorized service center as soon as possible. Taking swift action will not only enhance your safety but also help maintain the overall integrity of your vehicle.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.