How to Fix Kia Forte Brake Light Failure: A DIY Guide

By Nick Marchenko, PhD

Brake light failure on a Kia Forte can be a perplexing issue for many drivers. This guide aims to shed light on the common causes and solutions for this problem, ensuring your vehicle remains safe and compliant with road safety regulations. It combines insights from various experiences and expert suggestions, focusing solely on the Kia Forte model.

Preliminary Checks

Before diving into more complex troubleshooting, start with the basics:

Bulb Inspection: Initially, it might seem like a simple bulb replacement is needed. However, finding that the bulbs are in good condition suggests the issue lies elsewhere. It's worth noting that even if the bulb appears fine, it's possible for both bulbs to fail simultaneously or for socket discoloration to occur, indicating potential electrical issues within the taillight assembly.

If your bulb has burned out and needs to be replaced - make sure you choose the right bulb size - it's important to ensure it works properly. Before purchasing a bulb, it is advisable to consult the chart below:

• 2021;
• 2020;
• 2019;
• 2018;
• 2017;
• 2016;
• 2015;
• 2014;
• 2013;
• 2012;
• 2011;
• 2010;

Fuse and Switch Inspection

Fuse Check: The first instinct might be to check the fuse. However, as discovered by some, the fuse might not always be the culprit. If the fuse related to the brake lights is intact, the problem requires further investigation.

Brake Light Switch: Often overlooked, a faulty brake light switch can cause the brake lights not to activate. This switch is crucial for signaling your brake application to the brake light system. Some Kia Forte models were subject to recalls for issues related to the brake light switch or the brake pedal stopper, which could affect the brake lights' functionality.

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Recall Verification

Recall Information: It's advisable to check for any recalls related to the Kia Forte's brake light system. Although some recalls might pertain to the brake lights staying on continuously, others address the lights not activating at all. Verifying with your vehicle identification number (VIN) on official safety or manufacturer websites can provide clarity on whether your vehicle is affected by a recall and eligible for a free fix.

Advanced Troubleshooting

Taillight Assembly and Socket Condition: Discoloration or damage within the taillight assembly and sockets can lead to consistent issues with the brake lights. In some cases, replacing the entire taillight assembly might be necessary to resolve the problem effectively.
Relay Replacement: For more persistent issues, inspecting and possibly replacing the brake light relay can be a solution. A non-clicking relay indicates a failure, necessitating replacement. Ensure you obtain the correct part (e.g., a 95235-1M200 12V 15A 5 pin box relay for some models) and avoid dealership markups by sourcing the part yourself if comfortable doing so.

Practical Advice

DIY Electrical Work: If you're inclined to tackle electrical troubleshooting, using a multimeter to test the lines and the functionality of both the bulbs and relay can be enlightening. However, exercise caution and ensure you have a basic understanding of automotive electrical systems to prevent further damage.

Professional Help: When in doubt, or if the issue persists despite your efforts, seeking professional assistance from a mechanic or an authorized dealer is advisable. While DIY solutions can be cost-effective and satisfying, certain problems may require specialized diagnostic tools and expertise.

Conclusion

Addressing brake light failure on a Kia Forte involves a systematic approach to eliminate common issues, from simple bulb replacement to more in-depth electrical troubleshooting. Always check for recalls as a first step, given their potential to provide a no-cost solution. Whether you decide to undertake repairs yourself or seek professional assistance, ensuring your brake lights function correctly is paramount for your safety and that of others on the road. Stay informed, stay safe, and drive responsibly.

See Also:

• What to do When Your Kia Forte Won't Start but Just Turns Over
• Kia Forte ABS Light is On? What it Means and How to Reset
• Kia Forte Bad O2 Sensors: How to Diagnose & Fix

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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