2019 Subaru Ascent Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2019 Subaru Ascent and How to Fix Them

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Reviewed by
Aisha
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 2019 Subaru Ascent 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 steps to diagnose the cruise control issue in a 2019 Subaru Ascent?

To effectively diagnose a cruise control issue in your 2019 Subaru Ascent, begin with the simplest solutions before progressing to more intricate assessments. Start by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, as malfunctioning buttons can hinder engagement. Following this, verify the speed sensor's performance, since a faulty sensor can lead to significant cruise control problems. Utilizing a diagnostic scanner to check for error codes can provide insights into specific issues affecting the system. Additionally, ensure that your brake lights are functioning correctly, as any issues with the brake light switch can prevent the cruise control from activating. Finally, inspect the vacuum lines for any leaks or damage, as these can disrupt the system's operation. By methodically addressing these components, you can effectively identify and resolve the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2019 Subaru Ascent?

When troubleshooting cruise control issues in a 2019 Subaru Ascent, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake light switch, which can prevent the cruise control from engaging since the system is designed to disengage when the brake pedal is pressed. Additionally, speed sensor issues can disrupt the cruise control's functionality, as accurate speed readings are crucial for maintaining set speeds. A blown fuse in the cruise control system can also lead to a complete failure, cutting off power to the system. Furthermore, problems with the throttle control, such as a malfunctioning throttle position sensor, can hinder the cruise control's ability to maintain speed. Lastly, if the Electronic Control Module (ECM) encounters issues, it can affect various vehicle functions, including cruise control. If you experience any of these problems, it's advisable to consult a qualified mechanic for a thorough inspection and diagnosis.

How urgent is it to address the malfunctioning cruise control in a 2019 Subaru Ascent?

Addressing a malfunctioning cruise control in a 2019 Subaru Ascent is of utmost importance due to the significant safety risks it poses. A malfunction can lead to unexpected acceleration or deceleration, making it difficult for the driver to maintain control of the vehicle, which could result in dangerous situations on the road. Furthermore, delaying repairs can exacerbate the problem, potentially leading to more extensive damage to the vehicle's systems, which may incur higher repair costs down the line. It is crucial to recognize that ignoring these symptoms not only jeopardizes the safety of the driver and passengers but also increases the likelihood of accidents. Therefore, it is highly advisable to consult a qualified mechanic or an authorized Subaru service center as soon as possible to diagnose and rectify the issue, ensuring the vehicle operates safely and efficiently. Taking prompt action is essential to safeguard both the occupants and the integrity of the vehicle.

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2019 Subaru Ascent Cruise Control Problems & Solutions