2021 Mazda CX-9 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Mazda CX-9

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Reviewed by
Andrew Hajjar
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 2021 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 2021 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 steps should I take to diagnose the cruise control issue in my 2021 Mazda CX-9?

When diagnosing the cruise control issue in your 2021 Mazda CX-9, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, since faulty buttons can lead to engagement problems. Following this, verify the speed sensor's performance, as it plays a crucial role in maintaining your vehicle's speed; any malfunction here can directly affect cruise control. Utilizing an OBD-II scanner to check for error codes can provide further insights into potential issues, guiding your next steps. Additionally, ensure that the brake lights are functioning correctly, as they are integral to the cruise control system's operation. Lastly, inspect the vacuum lines for any leaks or damage, as these can also contribute to cruise control malfunctions. By methodically following these steps, you can effectively identify and address the root cause of the cruise control issue in your Mazda CX-9.

What are the common issues that could cause the cruise control to stop working in a 2021 Mazda CX-9?

When dealing with cruise control issues in a 2021 Mazda CX-9, it's essential to understand the common problems that may arise. One frequent culprit is a faulty brake pedal switch, which can disrupt the system's ability to engage or disengage as intended. Additionally, problems with the speed sensor can prevent the cruise control from maintaining a steady speed, leading to functionality issues. A blown fuse within the cruise control system is another simple yet often overlooked cause that can halt operation entirely. Furthermore, the throttle actuator, responsible for managing engine throttle, may malfunction, affecting the cruise control's performance. Lastly, any electrical issues, such as wiring faults or a defective control module, can also contribute to cruise control failure. By identifying and addressing these potential problems, you can effectively troubleshoot and restore the cruise control functionality in your vehicle.

How urgent is it to address the non-functioning cruise control in a 2021 Mazda CX-9?

When faced with a non-functioning cruise control in a 2021 Mazda CX-9, it is crucial to recognize the urgency of the situation. Cruise control not only enhances driving comfort by maintaining a steady speed, but it also plays a role in overall vehicle performance and safety. A malfunctioning system may signal deeper issues within the vehicle, potentially affecting critical components. Ignoring this problem could lead to increased driver fatigue during long trips, as well as a higher risk of accidents due to sudden speed changes. Moreover, unresolved cruise control issues might escalate into more significant mechanical failures, resulting in costly repairs. Therefore, it is advisable to diagnose and address any cruise control malfunctions promptly to ensure both the safety of the driver and the longevity of the vehicle. Taking action sooner rather than later can prevent minor issues from developing into major safety hazards.

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