2008 Hyundai Sonata Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 Hyundai Sonata and How to Fix Them

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Reviewed by
Devin Cabugcal
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 2008 Hyundai Sonata 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 2008 Hyundai Sonata 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 first steps to diagnose cruise control issues in a 2008 Hyundai Sonata?

When diagnosing cruise control issues in your 2008 Hyundai Sonata, it's essential to start with the simplest and most accessible checks. Begin by inspecting the vehicle's fuse box for any blown fuses, as these are often the primary cause of cruise control malfunctions. Look specifically for fuses associated with the cruise control system, as a blown fuse can interrupt the power supply to critical components like the cruise control switch and the Vehicle Speed Sensor (VSS). By addressing these basic electrical issues first, you can potentially resolve the problem without delving into more complex diagnostics, making it an ideal starting point for any DIY repair enthusiast.

What common issues cause cruise control failure in a 2008 Hyundai Sonata?

When troubleshooting cruise control failure in a 2008 Hyundai Sonata, it's essential to consider several common issues that may be at play. One frequent culprit is a malfunctioning control module, which can disrupt the system's ability to maintain speed. Additionally, sensor or switch failures can prevent the cruise control from engaging properly. Throttle actuation problems are another potential issue, as they can hinder the system's responsiveness. It's also wise to check for blown fuses, which are often an easy fix and can be identified by consulting the owner's manual. Furthermore, faulty brake switches are a well-known cause of cruise control malfunctions in this model; replacing the switch can often resolve the issue. Lastly, the condition of the brake pedal and throttle body should not be overlooked, as these components can significantly impact the cruise control's functionality. By systematically addressing these areas, DIYers can effectively diagnose and potentially fix cruise control issues in their Sonata.

How urgent is it to address the non-functioning cruise control in a 2008 Hyundai Sonata?

When it comes to the non-functioning cruise control in your 2008 Hyundai Sonata, understanding the urgency of the situation is key to making an informed decision about repairs. While cruise control is primarily a convenience feature, its failure can lead to inconveniences, especially for those who rely on it for long drives or maintaining consistent speeds. Ignoring this issue may not pose immediate safety risks, but it can lead to more significant problems if the underlying cause is left unaddressed. For instance, a blown fuse or a minor malfunction could escalate into more complex repairs if not tackled promptly. Therefore, it is advisable to troubleshoot the system to identify the root cause of the failure. By doing so, you can determine whether a simple fix is possible or if further intervention is necessary. Ultimately, while the urgency may not be critical, addressing the cruise control issue in a timely manner can enhance your driving experience and prevent future complications, making it a worthwhile DIY project.

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