2017 Kia Optima Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2017 Kia Optima 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 2017 Kia Optima 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 2017 Kia Optima 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.

What are the initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2017 Kia Optima?

When troubleshooting a non-functioning cruise control in a 2017 Kia Optima, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown or damaged fuse can easily disrupt the system's functionality. Next, inspect the cruise control switch located on the steering wheel; ensure it is operational and not stuck or damaged. Following this, verify that the brake lights are functioning correctly, since a malfunctioning brake light switch can inadvertently disable the cruise control. Additionally, examine the vehicle speed sensor to confirm it is accurately relaying speed information to the cruise control module. Finally, if the previous steps do not reveal the issue, consider scanning the vehicle's onboard computer for any error codes that may indicate specific problems within the cruise control system. By methodically working through these steps, you can effectively identify and address the root cause of the cruise control malfunction.

What are the common problems that could cause the cruise control to stop working in a 2017 Kia Optima?

When troubleshooting cruise control issues in a 2017 Kia Optima, it's essential to consider several common problems that could be at play. One of the first components to check is the brake pedal switch, as a faulty switch can disrupt the cruise control's ability to engage or disengage. Additionally, the speed sensor plays a crucial role in maintaining a constant speed; if it malfunctions, the cruise control may fail to operate correctly. Another potential culprit is a blown fuse within the cruise control system, which can completely disable its functionality. It's also important to inspect the throttle control system, as any malfunctions here can hinder the cruise control's performance. Lastly, issues with the Electronic Control Module (ECM) can significantly impact the cruise control system, as it manages various vehicle functions. By systematically examining these components, DIYers can identify and potentially resolve the issues affecting their cruise control system.

How urgent is it to address the non-functioning cruise control in a 2017 Kia Optima?

Addressing a non-functioning cruise control in a 2017 Kia Optima is crucial for both safety and vehicle performance. When cruise control fails, it may not only diminish the convenience of maintaining a steady speed during long drives but could also signal deeper mechanical issues that require immediate attention. Ignoring this symptom can lead to increased driver fatigue, as the driver must constantly monitor and adjust their speed, which can be particularly taxing on extended journeys. Moreover, a malfunctioning cruise control system might indicate problems with other critical components, such as the throttle or braking systems, potentially compromising the vehicle's overall safety. Therefore, it is essential to diagnose and repair any cruise control issues promptly to prevent further damage and ensure a safe driving experience. Taking action sooner rather than later can save you from more significant repairs and enhance your vehicle's reliability on the road.

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