2020 Kia Optima Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2020 Kia Optima 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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2020 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 2020 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 steps to diagnose the cruise control issue in a 2020 Kia Optima?

To effectively diagnose a cruise control issue in a 2020 Kia Optima, start with 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 often be the root of the problem. Next, examine the cruise control buttons on the steering wheel to ensure they are functioning correctly and not stuck. Utilizing an OBD-II scanner can provide valuable insights by revealing any error codes associated with the cruise control system. It's also essential to check the speed sensors, as they are integral to the system's operation. Additionally, verify that the brake lights are working properly, since a malfunctioning brake light switch can disrupt cruise control functionality. If these initial checks do not resolve the issue, proceed to test the cruise control module for proper signal transmission. Finally, inspect the wiring and connections for any signs of damage or corrosion. If the problem persists after these steps, consulting a professional mechanic is advisable for a thorough diagnosis and repair. This methodical approach not only helps in identifying the issue but also ensures that you cover all potential causes efficiently.

What are the common problems that could cause the cruise control to stop working in a 2020 Kia Optima?

When troubleshooting the cruise control system in a 2020 Kia Optima, it's essential to understand the common problems that may cause it to stop working. A faulty brake pedal switch is often the primary issue, as this component is responsible for disengaging the cruise control when the brake is pressed; if it malfunctions, the system may not engage at all. Additionally, a blown fuse can interrupt the electrical supply to the cruise control, preventing it from operating. The speed sensor is another critical element; if it fails, the cruise control may struggle to maintain a steady speed, resulting in inconsistent performance. Moreover, a malfunctioning throttle actuator can impede the system's ability to control speed effectively. Lastly, wiring issues, such as damaged or corroded connections, can disrupt communication between the cruise control components. Identifying and addressing these problems promptly is vital for restoring the cruise control functionality and ensuring a safe and enjoyable driving experience.

How urgent is it to address the malfunctioning cruise control in a 2020 Kia Optima?

Addressing a malfunctioning cruise control in a 2020 Kia Optima is of utmost importance due to the safety risks it poses. A faulty system can lead to unexpected acceleration or deceleration, creating hazardous driving conditions that could result in accidents. Additionally, neglecting this issue can diminish the overall driving experience, as the convenience of cruise control is compromised. Furthermore, a malfunctioning cruise control can lead to inconsistent speed management, which may increase fuel consumption and ultimately cost you more at the pump. By addressing the problem promptly, you not only enhance your safety but also protect your vehicle from further damage, potentially saving on costly repairs down the line. Therefore, it is crucial to take immediate action if you notice any signs of cruise control malfunction in your Kia Optima.

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2020 Kia Optima Cruise Control Issues & Repair Costs