Resetting the check engine light on your 2019 Chevy Equinox is possible after fixing the underlying issue. This guide walks you through manual and OBD2 scanner methods, safety tips, and what to do if the light returns.
Key Takeaways
- Never ignore the check engine light – It signals a problem that needs diagnosis and repair before resetting.
- Use an OBD2 scanner for accuracy – This tool reads error codes and safely clears the light after repairs.
- Manual reset methods may not work – Disconnecting the battery or using the gas pedal trick often fails on modern vehicles like the 2019 Equinox.
- Drive cycle completion is essential – After resetting, drive normally so the vehicle’s computer can retest systems.
- Recurring light means unresolved issues – If the light returns, recheck codes and consult a mechanic if needed.
- Regular maintenance prevents future warnings – Keep up with oil changes, air filters, and spark plugs to avoid common triggers.
- Always verify repairs before resetting – Clearing the light without fixing the problem is unsafe and ineffective.
How to Reset Check Engine Light on 2019 Chevy Equinox
If you’ve recently fixed an issue in your 2019 Chevy Equinox and the check engine light is still on, you’re not alone. Many drivers assume that once a problem is resolved, the warning light will disappear on its own. Unfortunately, that’s not how modern vehicles work. The onboard computer system—known as the Engine Control Unit (ECU)—stores trouble codes even after the issue is fixed. To turn off the light, you need to reset it manually.
In this comprehensive guide, you’ll learn exactly how to reset the check engine light on your 2019 Chevy Equinox. We’ll cover two reliable methods: using an OBD2 scanner and a manual battery disconnect (with caveats). You’ll also discover why some common “tricks” don’t work on newer models, how to interpret error codes, and what to do if the light comes back on. Whether you’re a DIY enthusiast or just want to save a trip to the mechanic, this step-by-step guide will help you handle the process safely and effectively.
Why the Check Engine Light Comes On
Visual guide about How to Reset Check Engine Light on 2019 Chevy Equinox
Image source: nissancheckenginelight.com
Before diving into reset methods, it’s important to understand why the check engine light illuminates in the first place. The 2019 Chevy Equinox is equipped with an advanced onboard diagnostics system (OBD2) that constantly monitors engine performance, emissions, fuel system efficiency, and other critical components.
When the system detects a malfunction—such as a loose gas cap, faulty oxygen sensor, or misfiring spark plug—it triggers the check engine light and stores a diagnostic trouble code (DTC). These codes help technicians pinpoint the exact issue.
Common causes include:
- Loose or damaged gas cap
- Faulty oxygen (O2) sensor
- Worn spark plugs or ignition coils
- Catalytic converter problems
- Mass airflow (MAF) sensor issues
- Evaporative emissions system leaks
Ignoring the light can lead to reduced fuel efficiency, increased emissions, and even engine damage over time. That’s why it’s crucial to diagnose and fix the problem before attempting to reset the light.
Method 1: Reset Using an OBD2 Scanner (Recommended)
The most reliable and accurate way to reset the check engine light on your 2019 Chevy Equinox is by using an OBD2 scanner. This handheld device plugs into your vehicle’s diagnostic port and communicates directly with the ECU. It can read trouble codes, provide detailed descriptions, and safely clear the light after repairs.
Step 1: Purchase or Borrow an OBD2 Scanner
You can buy a basic OBD2 scanner online or at auto parts stores for as little as $20. Popular brands include BlueDriver, Autel, and Innova. If you don’t want to purchase one, many auto parts stores (like AutoZone or O’Reilly) offer free code reading and clearing services.
Step 2: Locate the OBD2 Port
In the 2019 Chevy Equinox, the OBD2 port is located under the dashboard on the driver’s side, near the steering column. It’s a 16-pin connector, usually black or gray, and may be covered by a small panel. You don’t need any tools to access it—just reach under the dash and feel for the port.
Step 3: Turn the Ignition to the “On” Position
Do not start the engine. Instead, turn the key to the “ON” position (or press the Start button without pressing the brake). This powers up the vehicle’s electrical system without engaging the engine. The dashboard lights will illuminate, indicating the system is active.
Step 4: Plug in the OBD2 Scanner
Insert the scanner’s connector into the OBD2 port. Make sure it’s fully seated. Most scanners will power on automatically when connected. If not, press the power button.
Step 5: Read the Trouble Codes
Follow the scanner’s on-screen prompts to read the stored trouble codes. The device will display one or more codes (e.g., P0420 or P0171). Write these down or take a photo for reference. Each code corresponds to a specific issue—your scanner may also provide a brief description.
For example:
- P0420 – Catalyst System Efficiency Below Threshold
- P0171 – System Too Lean (Bank 1)
- P0300 – Random/Multiple Cylinder Misfire Detected
Use the scanner’s built-in code library or search online to understand what each code means. This helps confirm that the issue has been properly addressed.
Step 6: Clear the Codes
Once you’ve confirmed the problem is fixed, use the scanner to clear the trouble codes. Look for an option like “Clear Codes,” “Erase DTCs,” or “Reset.” Confirm the action when prompted.
After clearing, the scanner may display “No Codes” or “System OK.” The check engine light should turn off within a few seconds. If it doesn’t, try turning the ignition off and back on.
Step 7: Test Drive the Vehicle
Start the engine and take your Equinox for a short drive—about 10 to 15 minutes—under normal conditions. This allows the ECU to run its self-tests and confirm that all systems are functioning properly. If the light stays off, the reset was successful.
Method 2: Manual Reset (Battery Disconnect)
Some drivers try to reset the check engine light by disconnecting the battery. While this method works on older vehicles, it’s less reliable on modern cars like the 2019 Equinox due to advanced memory systems and adaptive learning.
Still, if you don’t have access to an OBD2 scanner, you can attempt a manual reset—but proceed with caution.
Step 1: Turn Off the Engine and Remove the Key
Make sure the vehicle is completely off. Remove the key from the ignition or press the Start button to turn off the engine and all electronics.
Step 2: Locate the Battery
Open the hood and locate the 12-volt battery. In the 2019 Equinox, it’s on the driver’s side of the engine compartment, near the front.
Step 3: Disconnect the Negative Terminal
Use a wrench (usually 10mm) to loosen the nut on the negative (black) battery terminal. Carefully remove the cable and secure it away from the battery post to prevent accidental contact.
Step 4: Wait 15–30 Minutes
Leave the battery disconnected for at least 15 minutes. This allows the ECU to lose power and reset its memory. Some experts recommend up to 30 minutes for a full reset.
Step 5: Reconnect the Battery
Reattach the negative cable and tighten the nut securely. Make sure the connection is firm to avoid electrical issues.
Step 6: Turn on the Ignition
Turn the key to the “ON” position (without starting the engine). Wait a few seconds, then start the vehicle. The check engine light may flash briefly before turning off.
Important Notes About Manual Reset
- Not guaranteed to work – The 2019 Equinox uses persistent memory that may retain codes even after power loss.
- Resets other systems – Disconnecting the battery can reset radio presets, clock, seat memory, and adaptive transmission settings.
- May trigger new warnings – Some systems (like TPMS) may require recalibration after a battery disconnect.
- Doesn’t fix the problem – If the underlying issue remains, the light will likely return after a few drive cycles.
For these reasons, the OBD2 scanner method is strongly preferred.
Why Common “Tricks” Don’t Work on the 2019 Equinox
You may have heard of quick fixes like pressing the gas pedal three times or turning the key on and off rapidly. These methods were sometimes effective on older vehicles but are ineffective on the 2019 Chevy Equinox.
Modern vehicles use sophisticated software that requires a proper reset command from a diagnostic tool. The ECU is designed to prevent accidental or unauthorized resets, so “hacks” rarely work.
Additionally, the Equinox’s onboard computer continuously monitors emissions and performance. Even if the light turns off temporarily, it will reappear if the system detects the same fault during its next test cycle.
What to Do If the Light Comes Back On
If the check engine light returns after resetting, it means the original problem hasn’t been fully resolved—or a new issue has developed.
Step 1: Re-Scan for Codes
Use your OBD2 scanner to read the new or recurring trouble codes. Compare them to the previous ones to see if it’s the same issue or something new.
Step 2: Inspect Common Causes
For example:
- If the code is P0455 (large evaporative leak), check the gas cap—it may be loose, cracked, or missing.
- If it’s P0301 (cylinder 1 misfire), inspect the spark plug and ignition coil for that cylinder.
- If it’s P0171 (lean condition), check for vacuum leaks or a dirty MAF sensor.
Step 3: Perform Repairs or Seek Professional Help
Some issues, like replacing a gas cap or cleaning a MAF sensor, are DIY-friendly. Others, such as catalytic converter replacement or internal engine problems, require a qualified mechanic.
Don’t ignore recurring codes. Persistent problems can lead to costly repairs down the line.
Preventing Future Check Engine Light Issues
The best way to avoid check engine light problems is through regular maintenance. Here are some proactive steps:
- Replace the gas cap if it’s cracked or doesn’t tighten securely.
- Change spark plugs every 60,000–100,000 miles (check your owner’s manual).
- Replace the air filter every 15,000–30,000 miles to maintain proper airflow.
- Use quality fuel and consider fuel system cleaners periodically.
- Address warning lights promptly—don’t wait to diagnose and fix issues.
Regular oil changes and scheduled inspections also help keep the engine running smoothly and reduce the risk of sensor failures.
When to See a Mechanic
While many check engine light issues can be handled at home, some require professional attention. Visit a certified mechanic if:
- The light is flashing (indicates a severe misfire that can damage the catalytic converter).
- You notice performance issues like rough idling, stalling, or loss of power.
- The same code keeps returning after repairs.
- You’re unsure how to interpret or fix the trouble code.
A professional diagnostic can save time and prevent further damage.
Conclusion
Resetting the check engine light on your 2019 Chevy Equinox is a straightforward process—if you follow the right steps. The most effective method is using an OBD2 scanner to read and clear trouble codes after confirming the underlying issue is fixed. Manual resets, like disconnecting the battery, are less reliable and can cause other system resets.
Always address the root cause of the warning light before attempting a reset. Ignoring problems can lead to decreased performance, lower fuel economy, and expensive repairs. With regular maintenance and prompt attention to warning signs, you can keep your Equinox running smoothly and avoid unnecessary trips to the repair shop.
By following this guide, you’re now equipped to handle check engine light issues confidently and safely. Remember: a reset is only successful when the problem is truly solved.