2020 Mazda CX-9 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2020 Mazda CX-9 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 2020 Mazda CX-9 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.

How much does it cost to fix a 2020 Mazda CX-9 cruise control isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What are the initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2020 Mazda CX-9?

When faced with a non-functioning cruise control in your 2020 Mazda CX-9, it's important to approach the diagnosis methodically. Start by checking the cruise control fuse; a blown fuse is a common and easily fixable issue that can halt the system's operation. Next, inspect the cruise control switch located on the steering wheel to ensure it is working correctly, as a malfunctioning switch can prevent engagement. Additionally, verify that your brake lights are functioning properly, since a faulty brake light switch can inadvertently disable the cruise control. It's also crucial to check the vehicle speed sensor, as it provides necessary data for the cruise control system to operate effectively. Finally, consider scanning the vehicle's onboard computer for any error codes that may indicate specific problems within the cruise control system. By following these steps, you can systematically troubleshoot and potentially resolve the issue with your cruise control, making your DIY repair efforts more effective.

What are the common problems that could cause the cruise control to stop working in a 2020 Mazda CX-9?

When troubleshooting cruise control issues in a 2020 Mazda CX-9, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake pedal switch, which can disrupt the system's ability to engage or disengage as needed. Additionally, a malfunctioning speed sensor can prevent the cruise control from maintaining the desired speed, leading to erratic performance. It's also worth checking for a blown fuse, as this can completely disable the cruise control system. Problems with the throttle control system, such as a defective throttle position sensor, can further complicate matters, affecting how the vehicle responds to cruise control commands. Lastly, electrical issues, including wiring faults, can also contribute to cruise control failure. By systematically examining these potential issues, you can effectively diagnose and address the malfunction, restoring your cruise control functionality.

How urgent is it to address the malfunctioning cruise control in my 2020 Mazda CX-9?

When it comes to the malfunctioning cruise control in your 2020 Mazda CX-9, addressing the issue should be a top priority. A malfunctioning system can lead to unexpected acceleration or deceleration, creating a significant safety hazard on the road. This unpredictability not only increases the risk of accidents but can also distract the driver, leading to fatigue from the constant need to manually control the vehicle's speed. Furthermore, neglecting this issue can result in higher fuel consumption due to inconsistent speed management, ultimately costing you more in the long run. By addressing the problem early, you can prevent it from escalating into more serious and costly repairs, ensuring a safer and more efficient driving experience. Therefore, it is highly advisable to consult a qualified mechanic or an authorized Mazda service center to diagnose and resolve the malfunction promptly.

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