2015 Kia Optima Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2015 Kia Optima and How to Fix Them

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Reviewed by

Andrew Hajjar

Written by RepairPal Car Genius

Updated January 14, 2025

30% chance it's the

Sensor

25% chance it's the

Control Module

25% chance it's the

Throttle

20% chance it's

Something else

The most common reasons a 2015 Kia Optima 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.

What are the best Kia repair shops?

RepairPal Certified shops can diagnose and repair your 2015 Kia Optima electronics and electrical issues. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

How much does it cost to fix a 2015 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.

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.

How urgent is it to address the malfunctioning cruise control in a 2015 Kia Optima?

Addressing a malfunctioning cruise control in a 2015 Kia Optima is not just a matter of convenience; it is a critical safety concern that should be prioritized. When cruise control fails, it can lead to increased driver fatigue during long trips, as maintaining a constant speed becomes more labor-intensive. Moreover, the underlying causes of cruise control malfunctions—such as faulty control modules, sensor issues, or brake pedal switch failures—can escalate into more significant problems if left unattended. Ignoring these symptoms may not only compromise your driving comfort but could also result in further damage to the vehicle's systems, potentially leading to costly repairs down the line. Therefore, it is essential to address any cruise control issues promptly to ensure a safer driving experience and to maintain the functionality of your vehicle. Taking action now can prevent minor inconveniences from evolving into major safety risks on the road.

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