2006 Mazda RX-8 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2006 Mazda RX-8 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2006 Mazda RX-8 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty sensor can lead to incorrect readings, causing issues with engine performance or triggering warning lights on the dashboard.
  • Control Module: A faulty control module can result in 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 acceleration and poor engine 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 2006 Mazda RX-8 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.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

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 steps to diagnose the non-functioning cruise control in a 2006 Mazda RX-8?

To effectively diagnose the non-functioning cruise control in your 2006 Mazda RX-8, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the fuse box for any blown fuses related to the cruise control system, as a blown fuse can disrupt power to critical components. Next, check the brake lights, since faulty brake lights can interfere with cruise control operation; ensure they are functioning properly by having someone press the brake pedal while you observe. Following this, examine the brake pedal switch, which is essential for cruise control engagement; a defective switch can prevent the system from activating. Additionally, inspect the throttle control system to confirm that all components are in good working order, as issues here can also affect cruise control functionality. Finally, verify the cruise control module by measuring voltage and checking for continuity at its terminals, as discrepancies may indicate a need for further investigation. By following this diagnostic approach, you can efficiently identify and address the underlying issues affecting your cruise control system.

What causes cruise control failure in a 2006 Mazda RX-8?

When experiencing cruise control failure in a 2006 Mazda RX-8, several common problems may be at play. One of the primary culprits could be a failed control module, sensor, or switch, which are essential for the system's operation. Additionally, throttle actuation problems can prevent the cruise control from maintaining speed, as can a malfunctioning vacuum reservoir that fails to provide the necessary vacuum pressure. It's also worth checking for a blown fuse dedicated to the cruise control system, as this can easily disrupt functionality. Another potential issue is a defective brake pedal switch, which may incorrectly signal that the brakes are engaged, thereby disabling cruise control. Lastly, problems within the throttle control system or the ABS can also interfere with cruise control performance. By systematically examining these components, DIYers can effectively diagnose and address the underlying issues causing cruise control failure in their RX-8.

How urgent is it to address the non-functioning cruise control in a 2006 Mazda RX-8?

While the non-functioning cruise control in a 2006 Mazda RX-8 may not pose an immediate safety risk, it is still advisable to address the issue promptly. Ignoring the malfunction can lead to increased driver fatigue during long trips, as the system is designed to enhance comfort and reduce the physical strain of maintaining speed. Additionally, a malfunctioning cruise control system can negatively impact fuel efficiency, leading to higher fuel costs over time. Common causes of cruise control failure, such as blown fuses or faulty switches, can often be diagnosed and repaired relatively easily. By taking the time to investigate and resolve these issues, you not only restore the functionality of your vehicle but also enhance your overall driving experience. Therefore, while it may not be urgent, timely attention to your cruise control system is beneficial for both comfort and efficiency.

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Cruise Control Malfunction in 2006 Mazda RX-8