Resetting the check engine light on your 2015 Kia Soul doesn’t have to be complicated. This guide walks you through multiple proven methods—from using an OBD2 scanner to disconnecting the battery—so you can clear the warning light after fixing the underlying issue. Always diagnose the root cause first to avoid recurring problems.
Key Takeaways
- Diagnose before resetting: Never reset the check engine light without identifying and fixing the root cause—otherwise, it will likely return.
- Use an OBD2 scanner for best results: This is the safest, most reliable method to clear codes and reset the light on your 2015 Kia Soul.
- Battery disconnection works—but has side effects: Unplugging the battery can reset the system, but may also reset radio settings, clock, and adaptive transmission learning.
- Driving cycles may clear minor issues: Some temporary faults resolve on their own after a few drive cycles, but persistent problems need attention.
- Avoid quick-fix myths: Pouring additives or using “miracle” products won’t fix mechanical issues or reliably turn off the light.
- Keep records of repairs and resets: Documenting what you’ve done helps with future diagnostics and resale value.
- Seek professional help if unsure: If you can’t identify the problem or the light returns frequently, consult a certified mechanic.
How to Reset Check Engine Light on 2015 Kia Soul
If you’ve recently fixed an issue with your 2015 Kia Soul—like replacing a loose gas cap or fixing an oxygen sensor—you might notice the check engine light is still on. That’s because the vehicle’s onboard computer hasn’t yet recognized that the problem is resolved. Resetting the check engine light tells the system to recheck all sensors and emissions components. This guide will walk you through several safe, effective methods to reset the check engine light on your 2015 Kia Soul, from using a professional OBD2 scanner to simple battery disconnection. We’ll also cover important precautions, troubleshooting tips, and what to do if the light keeps coming back.
By the end of this guide, you’ll know exactly how to reset the check engine light, understand why it came on in the first place, and feel confident maintaining your Kia Soul’s health. Whether you’re a DIY enthusiast or just want to save a trip to the mechanic, these steps are designed to be clear, practical, and easy to follow.
Why the Check Engine Light Comes On
Visual guide about How to Reset Check Engine Light on 2015 Kia Soul
Image source: kiacheckenginelight.com
Before you reset the light, it’s crucial to understand why it turned on in the first place. The check engine light—also known as the malfunction indicator lamp (MIL)—is part of your vehicle’s onboard diagnostics system (OBD2). When a sensor detects an issue with the engine, emissions, or transmission, it sends a signal to the engine control unit (ECU), which then illuminates the light on your dashboard.
Common causes for the check engine light on a 2015 Kia Soul include:
- Loose or faulty gas cap: This is one of the most frequent causes. A loose cap allows fuel vapors to escape, triggering an evaporative emissions code.
- Oxygen (O2) sensor failure: These sensors monitor exhaust gases and help regulate fuel mixture. A faulty sensor can reduce fuel efficiency and increase emissions.
- Catalytic converter issues: Over time, the catalytic converter can become clogged or fail, leading to reduced performance and increased emissions.
- Mass airflow (MAF) sensor problems: This sensor measures how much air enters the engine. If it’s dirty or malfunctioning, it can cause poor acceleration and rough idling.
- Spark plug or ignition coil failure: Worn spark plugs or faulty coils can cause misfires, which trigger the check engine light.
- Exhaust gas recirculation (EGR) valve issues: A stuck or clogged EGR valve can lead to rough idling and increased emissions.
Ignoring the check engine light can lead to reduced fuel economy, increased emissions, and even engine damage over time. That’s why it’s essential to diagnose the issue before attempting to reset the light.
Method 1: Use an OBD2 Scanner (Recommended)
The most reliable and recommended way to reset the check engine light on your 2015 Kia Soul is by using an OBD2 scanner. This tool reads the diagnostic trouble codes (DTCs) stored in your vehicle’s computer, allowing you to identify the problem and then clear the codes once it’s fixed.
What You’ll Need
- OBD2 scanner (Bluetooth or wired)
- Your 2015 Kia Soul
- Ignition key
Step-by-Step Instructions
Step 1: Locate the OBD2 Port
The OBD2 port in your 2015 Kia Soul is typically located under the dashboard on the driver’s side, near the steering column. It’s a 16-pin connector that looks like a trapezoid. You may need to crouch down or use a flashlight to find it. It’s usually within arm’s reach when you’re sitting in the driver’s seat.
Step 2: Plug in the OBD2 Scanner
Turn off the ignition, then plug the OBD2 scanner into the port. Make sure it’s securely connected. Some scanners will power on automatically when plugged in, while others require you to turn the ignition to the “ON” position (without starting the engine).
Step 3: Turn the Ignition to “ON”
Turn the key to the “ON” position—this powers up the vehicle’s electrical system without starting the engine. The scanner should now communicate with the car’s computer.
Step 4: Read the Trouble Codes
Follow the scanner’s on-screen instructions to read the diagnostic trouble codes. Most scanners will display a list of codes, such as P0455 (large evaporative emission leak) or P0171 (system too lean). Write down these codes—they’ll help you understand what’s wrong.
Step 5: Fix the Underlying Issue
Once you know the problem, address it. For example:
- If the code is P0455, check and tighten the gas cap or replace it if damaged.
- If it’s P0135 (oxygen sensor heater circuit), you may need to replace the O2 sensor.
- If it’s P0300 (random misfire), inspect spark plugs and ignition coils.
Step 6: Clear the Codes
After fixing the issue, return to the scanner and select the option to “Clear Codes” or “Reset ECU.” Confirm the action when prompted. The scanner will send a command to the vehicle’s computer to erase the stored trouble codes.
Step 7: Turn Off the Ignition and Remove the Scanner
Turn the ignition off and unplug the scanner. Wait a few seconds, then start the engine. The check engine light should be off. If it remains on, the problem may not be fully resolved, or a new issue has been detected.
Tips for Using an OBD2 Scanner
- Use a reputable brand like BlueDriver, Innova, or Autel for accurate readings.
- Bluetooth scanners work with smartphone apps—great for real-time monitoring.
- Keep the scanner updated with the latest software for compatibility.
- Save or print the trouble codes before clearing them for future reference.
Method 2: Disconnect the Battery
If you don’t have an OBD2 scanner, disconnecting the battery is a common alternative. This method forces the vehicle’s computer to reset by cutting power to the ECU. However, it’s not as precise as using a scanner and may have unintended consequences.
What You’ll Need
- Wrench or socket set (usually 10mm)
- Safety gloves and glasses
- Your 2015 Kia Soul
Step-by-Step Instructions
Step 1: Turn Off the Engine and Remove the Key
Make sure the vehicle is completely off and the key is out of the ignition. This prevents any electrical surges during the process.
Step 2: Locate the Battery
Open the hood and locate the battery. In the 2015 Kia Soul, it’s on the right side of the engine bay. You’ll see two terminals: positive (red, marked with a “+”) and negative (black, marked with a “-”).
Step 3: Disconnect the Negative Terminal
Using a wrench, loosen the nut on the negative terminal (black cable). Carefully remove the cable and tuck it away from the battery so it doesn’t accidentally touch the terminal.
Step 4: Wait 15–30 Minutes
Leave the battery disconnected for at least 15 minutes. This allows the ECU to fully discharge and reset. Some experts recommend up to 30 minutes for a complete reset.
Step 5: Reconnect the Negative Terminal
After waiting, reattach the negative cable and tighten the nut securely. Make sure it’s snug but don’t overtighten.
Step 6: Start the Engine
Turn the ignition to “ON” and then start the engine. The check engine light should be off. If it comes back on, the issue may still exist.
Important Considerations
- Radio and clock reset: Disconnecting the battery will reset your radio presets, clock, and sometimes the navigation system. You may need to re-enter security codes for the radio.
- Adaptive learning reset: The transmission and engine may need to relearn driving patterns. Drive gently for the first 50–100 miles.
- Not always effective: If the problem wasn’t fixed, the light will return. This method only clears stored codes, not the root cause.
Method 3: Drive Cycle Reset (For Minor Issues)
In some cases, the check engine light may turn off on its own after a few drive cycles—especially if the issue was temporary, like a loose gas cap that you’ve since tightened. A drive cycle is a series of driving conditions that allow the vehicle’s computer to retest all emissions systems.
What Is a Drive Cycle?
A drive cycle typically includes:
- Starting the engine when cold
- Driving at varying speeds (city and highway)
- Accelerating and decelerating smoothly
- Idling for a few minutes
Recommended Drive Cycle for 2015 Kia Soul
Follow these steps to complete a full drive cycle:
- Start the engine when it’s cold (hasn’t been run for at least 8 hours).
- Let it idle for 2–3 minutes.
- Drive at 30–40 mph for 5 minutes.
- Accelerate to 55–60 mph and maintain speed for 10 minutes.
- Decelerate to 20 mph without braking hard.
- Stop and idle for 2 minutes.
- Repeat the cycle 2–3 times over a few days.
After completing the drive cycle, the check engine light may turn off if the system detects no faults. However, this method only works for minor, self-correcting issues.
Method 4: Use the Ignition Key Trick (Not Recommended)
Some online forums suggest a “key trick” to reset the check engine light: turning the ignition on and off in a specific sequence. For example:
- Turn the key to “ON” (don’t start)
- Wait 3 seconds
- Turn to “OFF”
- Repeat 3–5 times
While this may work on very old vehicles, it’s not effective on modern cars like the 2015 Kia Soul. The OBD2 system requires a proper reset command, which this method cannot provide. Avoid relying on this trick—it wastes time and may give a false sense of security.
Troubleshooting: What If the Light Comes Back On?
If you’ve reset the check engine light but it returns shortly after, the underlying problem hasn’t been resolved. Here’s what to do:
Recheck the Trouble Codes
Use your OBD2 scanner to read the new codes. Compare them to the previous ones—are they the same or different? This helps determine if the issue persists or if a new problem has emerged.
Inspect Common Culprits
- Gas cap: Ensure it’s tight and the seal isn’t cracked.
- O2 sensors: These often fail around 100,000 miles. Replace if faulty.
- Spark plugs: Check for wear or fouling. Replace every 60,000–100,000 miles.
- Air filter: A dirty filter can cause lean codes. Replace if clogged.
Check for Intermittent Issues
Some problems, like a loose wire or a failing sensor, may not trigger a code every time. These can be tricky to diagnose. If you’re unsure, consult a mechanic.
Visit a Professional Mechanic
If the light keeps returning or you’re unable to identify the issue, it’s time to seek professional help. A certified technician can perform a thorough inspection, including smoke tests for vacuum leaks or scope testing for ignition problems.
Safety and Maintenance Tips
Resetting the check engine light is only one part of vehicle maintenance. To keep your 2015 Kia Soul running smoothly:
- Use quality fuel: Stick to reputable gas stations to avoid contaminants.
- Follow the maintenance schedule: Refer to your owner’s manual for oil changes, filter replacements, and inspections.
- Address warning lights promptly: Don’t ignore the check engine light—early intervention saves money.
- Keep a repair log: Document all repairs, resets, and parts replaced.
- Use OEM or high-quality aftermarket parts: Cheap parts may fail prematurely.
Conclusion
Resetting the check engine light on your 2015 Kia Soul is a straightforward process—but only after you’ve addressed the root cause. The best method is using an OBD2 scanner, which allows you to read trouble codes, fix the issue, and clear the light safely. Disconnecting the battery is a viable alternative, though it comes with trade-offs like resetting your radio and clock. Drive cycles may work for minor issues, but persistent problems require professional diagnosis.
Remember: the check engine light is your car’s way of saying, “Something’s wrong.” Ignoring it or resetting it without fixing the problem can lead to bigger, costlier repairs down the road. Stay proactive, keep your vehicle well-maintained, and use the right tools to keep your Kia Soul running efficiently for years to come.