2020 Kia Forte Brake Lights Won't Turn Off: Fix Guide

Experiencing a situation where your 2020 Kia Forte brake lights won't turn off can be more than just an annoyance; it's a significant safety concern and a potential battery drain. Imagine parking your Forte, walking away, and noticing your brake lights are still brightly illuminated. This common issue can lead to a dead battery overnight, leaving you stranded, and signals to other drivers that you're braking, which can be dangerous and confusing on the road, increasing the risk of a rear-end collision. Understanding the root causes and how to diagnose them is crucial for any 2020 Kia Forte owner. This guide will walk you through the symptoms, verification steps, common causes, and practical solutions to get your brake lights functioning correctly again. For more general automotive repair guides, explore our articles section, or browse specific vehicle information at our vehicles hub.

What drivers notice on this 2020 Kia Forte

When the brake lights on your 2020 Kia Forte remain on, drivers typically notice it immediately after parking or when the vehicle is off. The most obvious sign is the constant illumination of the rear brake lights, even when the brake pedal is not depressed. This can happen whether the engine is running or completely shut off, and it often leads to a dead battery if not addressed promptly. It's a clear indicator that something in the brake light circuit or its activation system is malfunctioning. Beyond the direct observation, other subtle cues might emerge:

• Comments from others: Friends, family, or even strangers might point out that your brake lights are always on.
• Battery issues: Repeatedly finding your battery dead or struggling to start the car, especially after it's been parked for a while.
• Difficulty shifting: An inability to shift your automatic transmission out of Park (P) without excessive force.

These observations signal a need for immediate attention to prevent further issues or safety hazards.

At a glance: difficulty, repair cost, and diagnostic workflow

• Difficulty Rating: 6/10 — Moderate
• Common Symptoms: Brake lights constantly illuminated: The most direct and visible symptom, even when the vehicle is parked or the engine ; Rapid battery drain: If the lights remain on for extended periods, they will deplete your car's battery, leading to no-s; Difficulty shifting out of Park (P): The brake light switch is often integrated with the shift interlock system. A fault; Cruise control malfunction: Many vehicles, including the 2020 Kia Forte, use the brake light switch input for the cruise
• Estimated Repair Cost: $150–$1,100 (parts + typical shop labor)
• OEM Tooling Required: Standard OBD-II scanner and hand tools

Diagnostic workflow:

1. Confirm the symptom on your vehicle.
2. Scan for stored or pending codes with an OBD-II tool.
3. Inspect the most common causes in this guide (visual checks first).
4. Run verification tests before replacing parts.
5. Repair, clear codes, and verify on a test drive.

Symptoms and warning signs

Beyond the primary symptom of the brake lights staying on, several other indicators might accompany this issue on your 2020 Kia Forte, pointing to the underlying cause:

• Brake lights constantly illuminated: The most direct and visible symptom, even when the vehicle is parked or the engine is off.
• Rapid battery drain: If the lights remain on for extended periods, they will deplete your car's battery, leading to no-start conditions and potential damage to the battery itself.
• Difficulty shifting out of Park (P): The brake light switch is often integrated with the shift interlock system. A faulty switch might prevent you from shifting out of Park, as the car doesn't register that the brake pedal is being pressed.
• Cruise control malfunction: Many vehicles, including the 2020 Kia Forte, use the brake light switch input for the cruise control system. If the switch is faulty or constantly engaged, cruise control may not engage or may disengage unexpectedly, or even fail to disengage when the brakes are applied.
• Warning lights on the dashboard: While less common for just brake lights, a related issue might trigger a 'Check Engine' light, ABS warning light, or other brake system warnings on your instrument cluster.
• Rear-end collision risk: Other drivers may misinterpret your constantly illuminated brake lights, assuming you are braking, which increases the risk of an accident, especially at night.
• Brake pedal feels 'loose' or 'spongy': While less common, a severely damaged brake pedal stopper pad or a misadjusted switch could alter the feel of the brake pedal.
• Foul smell or visible smoke: In rare cases of severe electrical shorts, you might notice a burning smell or even smoke, indicating a more serious wiring issue.

How to verify and confirm the issue

Verifying that your 2020 Kia Forte brake lights are indeed staying on is straightforward, but confirming the cause requires a few practical tests. Before you begin, ensure your vehicle is parked on a level surface with the parking brake engaged.

1. Visual inspection: The simplest step is to observe the brake lights when the car is off and when the brake pedal is not pressed. Have someone stand behind the vehicle or use a reflective surface (like a garage door) to check. If they are on, the issue is present.
2. Check the brake pedal switch: Locate the brake pedal switch, typically mounted near the pivot point of the brake pedal arm, above the pedal. It's usually a small electrical component with a plunger or button.
   • Mechanical check: Look for a small plastic or rubber stopper pad on the brake pedal arm that contacts the switch. If this pad is missing or deteriorated (a very common issue on Kia/Hyundai vehicles), the switch plunger won't be fully depressed, causing the brake lights to stay on. This is often the simplest and most overlooked cause.
   • Electrical check: With the ignition off, try manually depressing the plunger on the switch. If the lights turn off when you fully depress it, the issue is likely the missing stopper pad or a misadjusted switch. You can also carefully disconnect the electrical connector from the switch; if the lights turn off, the switch itself is faulty or needs adjustment.
3. Inspect fuses and relays: Consult your owner's manual for the location of the fuse box (usually under the hood and/or inside the cabin). Identify the fuse and relay for the brake lights.
   • Fuse check: Visually inspect the fuse for a broken filament. You can also use a multimeter to check for continuity. A blown fuse would typically result in no brake lights, but a partially failed circuit could cause erratic behavior.
   • Relay check: Relays can stick in the 'on' position. You can try swapping the brake light relay with a known good, identical relay from a non-critical circuit (e.g., horn relay, if compatible) to see if the problem resolves.
4. Scan tool use (if helpful): While this isn't an OBD-II code-specific issue, a diagnostic scan tool might reveal codes related to the brake switch circuit (e.g., P0703 - Brake Switch B Circuit Malfunction). This can provide additional diagnostic clues, though it's not the primary method for this symptom. You can browse OBD-II codes for more information.
5. Check for Technical Service Bulletins (TSBs): Sometimes, manufacturers issue TSBs for known issues. A quick search for

Frequently asked questions

How urgent is this problem?

If symptoms are worsening or safety systems are affected, diagnose soon; minor issues can often wait for a scheduled service visit.

Can I drive with this issue?

Short trips may be acceptable for some faults, but stop driving if you notice overheating, loss of braking, steering problems, or strong fuel smells.

Do I need a dealer scan tool?

A basic OBD-II scanner helps confirm codes; some steps still need visual checks and meter tests described above.