Kia K4: Consumer info

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California perchlorate notice

In accordance with California state regulations regarding the handling of perchlorate-containing materials, please be advised that certain components within your Kia K4 may require specialized disposal procedures. For further information and regulatory guidance, please visit the official website: https://dtsc.ca.gov/perchlorate.

Notice to California Vehicle Dismantlers: Please note that specific components within the Kia K4—including, but not limited to, airbag inflators, seatbelt pre-tensioners, and batteries for keyless remote entry systems—contain perchlorate-bearing materials. These items must be handled, transported, and disposed of in strict accordance with the California Code of Regulations, Title 22, Section 67384.10(a). Professionals responsible for the dismantling or recycling of the Kia K4 are expected to adhere to these environmental safety standards to ensure proper compliance and ecological protection.

Additional Environmental Responsibility: As a responsible owner of a Kia K4, being aware of these requirements helps contribute to a safer environment. When replacing batteries in your keyless entry fobs or servicing safety restraint systems, we recommend utilizing authorized Kia service centers to ensure that all hazardous materials are processed through the correct recycling channels.

Consumer assistance for the Kia K4 (U.S. only) ➤

Electrical equipment (U.S. only)

The sophisticated electrical system of your Kia K4 is designed to perform reliably under all reasonably expected operating conditions. However, the integrity of this system relies on factory-specified components and wiring.

Before installing any additional electrical equipment or aftermarket accessories in your Kia K4, you must consult an authorized Kia dealer. Professional guidance is essential to ensure that such installations do not compromise your vehicle’s electrical architecture or inadvertently void your manufacturer's warranty.

Please be aware that specific types of aftermarket electrical equipment, or improper installation methods, can adversely affect the performance of critical vehicle systems—including the Engine Control Module (ECM), audio systems, and the high-output electrical charging infrastructure. Unauthorized modifications may lead to system-wide failures and potentially void all or part of your warranty coverage.

Kia America, Inc. assumes no responsibility for any expenses incurred or any malfunctions of the Kia K4, its components, or its electronic systems resulting from the installation of aftermarket electrical equipment that is not supplied, approved, or recommended by Kia.

Installation of a mobile two-way radio system

The improper installation of a mobile two-way radio system, or the use of an excessively powerful transmitter, may create electromagnetic interference that adversely affects the sensitive electronic control units within your Kia K4. To avoid damaging your vehicle’s electronic systems, always consult an authorized Kia dealer regarding proper equipment selection and approved installation procedures.

Kia vehicles are designed and manufactured to meet or exceed all applicable Federal Motor Vehicle Safety Standards (FMVSS).

We urge you to read and follow all directions provided in this owner’s manual, paying particular attention to information categorized under the headings NOTICE, CAUTION, and WARNING.

If you have any questions regarding the operation of your Kia K4, potential safety issues, or perceived defects after reviewing this manual, please contact the Kia toll-free Consumer Assistance hotline:

National Consumer Affairs Manager

Kia America, Inc.

P.O. Box 52410

Irvine, CA 92619-2410

1-800-333-4542

Reporting Safety Defects (U.S. only)

If you believe that your Kia K4 has a defect that could cause a crash, or could result in injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTSA) in addition to notifying Kia America, Inc. directly.

If the NHTSA receives similar complaints from other owners, it may initiate an investigation. Should it be determined that a safety defect exists in a group of vehicles, the administration may order a formal recall and remedy campaign. Please note, however, that the NHTSA cannot become involved in individual disputes or problems between you, your local dealer, or Kia America, Inc.

To contact the NHTSA regarding your Kia K4, you may call the Vehicle Safety Hotline toll-free at 1-888-327-4236 (TTY: 1-888-275-9171), visit their official website at http://www.NHTSA.gov, download the SaferCar mobile application, or write to: Administrator, NHTSA, 1200 New Jersey Ave, SE., West Building, Washington, DC 20590.

You can also obtain comprehensive information about motor vehicle safety and recalls at http://www.NHTSA.gov.

Online factory authorized manuals (U.S. only)

For owners seeking comprehensive technical documentation, the following official publications for your Kia K4 are available digitally at www.KiaTechinfo.com:

Service manual

This master guide covers detailed maintenance schedules and professional-grade procedures for repairing and servicing the engine and chassis components of your Kia K4. While written for the experienced journeyman technician, the manual is structured to be accessible and clear for any mechanically inclined Kia K4 owner.

Electrical troubleshooting manual

Designed as the essential companion to the Service Manual, this publication provides in-depth diagnostic information, wiring diagrams, and pin-out data for every electrical circuit found within the Kia K4.

Owner’s manual

This document serves as your primary reference for understanding the advanced safety features, interior amenities, and operating procedures required to get the most out of your Kia K4.

Other information:

Kia K4 (CL4) 2025-2026 Owner's Manual: Interior lights

Your Kia K4 is thoughtfully equipped with a variety of interior lights to ensure cabin visibility for all occupants. CAUTION To prevent the Kia K4 12V battery from discharging, avoid using interior lights for extended periods while the engine is not running. WARNING Never operate interior lights while driving in darkness. The reflection of these lights on the windows can significantly obscure your view of the road, potentially leading to accidents, serious injury, or death.

Kia K4 (CL4) 2025-2026 Owner's Manual: Navigation-based Smart Cruise Control limitations

The Navigation-based Smart Cruise Control (NSCC) system is a highly advanced convenience feature; however, its performance relies heavily on accurate real-time data. The system may exhibit abnormal or unexpected behavior under the following circumstances: The navigation system is experiencing a technical malfunction. Map data fails to transmit correctly due to glitches in the infotainment system screen.

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