2021 Kia K5 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2021 Kia K5 and How to Fix Them

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Reviewed by
Bo Fader
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 Kia K5 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 Kia K5 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 steps should I take to diagnose the non-functioning cruise control in my 2021 Kia K5?

To effectively diagnose the non-functioning cruise control in your 2021 Kia K5, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse located in the fuse box; a blown fuse is an easy fix that can often resolve the issue. Next, examine the cruise control buttons on your steering wheel for any signs of sticking or damage, as these can hinder functionality. If the buttons are in good condition, proceed to verify the speed sensors, as faulty sensors can disrupt the cruise control system's operation. Additionally, check the brake and clutch switches to ensure they are functioning correctly, since these components play a crucial role in engaging the cruise control. If these initial checks do not reveal the problem, use an OBD-II scanner to look for any error codes that may indicate specific issues within the system. Finally, inspect the wiring and connections associated with the cruise control for any signs of damage or loose connections, as these can also lead to malfunctions. By following this diagnostic approach, you can efficiently identify the root cause of the cruise control issue and take appropriate action to resolve it.

What are the common problems that could cause the cruise control to stop working in a 2021 Kia K5?

When troubleshooting cruise control issues in a 2021 Kia K5, it's essential to understand the common problems that may arise. One frequent culprit is a faulty brake light switch, which can prevent the cruise control from engaging since it is designed to deactivate when the brake pedal is pressed. Additionally, speed sensor malfunctions can disrupt the system's ability to maintain a constant speed, leading to operational failures. Another potential issue is a blown fuse related to the cruise control system; checking and replacing this fuse can often restore functionality. Furthermore, problems with the throttle control system can hinder the cruise control's performance, as it relies on accurate throttle input to maintain speed. Lastly, if the Electronic Control Module (ECM) is experiencing issues, it can significantly impact the cruise control operation. If you encounter any of these problems, it is advisable to consult a qualified mechanic for a thorough inspection and diagnosis to ensure your cruise control system is functioning correctly.

How urgent is it to address the malfunctioning cruise control in a 2021 Kia K5?

When it comes to a malfunctioning cruise control system in your 2021 Kia K5, the urgency to address the problem cannot be overstated. A faulty cruise control can lead to erratic vehicle behavior, such as unexpected acceleration or deceleration, which significantly increases the risk of accidents on the road. Ignoring these symptoms not only jeopardizes your safety but can also result in more severe damage to your vehicle's systems, leading to costly repairs down the line. Therefore, it is crucial to act swiftly by either conducting a thorough inspection yourself or seeking assistance from a qualified mechanic or authorized Kia service center. By prioritizing the repair of your cruise control system, you ensure not only your safety but also the longevity and reliability of your vehicle.

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