This guide walks you through how to dismiss the check engine light on a 2019 Traverse using simple tools and methods. You’ll learn when it’s safe to reset the light and when to seek professional help.
Key Takeaways
- Understand the cause first: Never reset the check engine light without diagnosing the underlying issue—doing so may mask serious problems.
- Use an OBD2 scanner: The most reliable way to clear the light is with an OBD2 scanner, which reads and clears diagnostic trouble codes (DTCs).
- Battery disconnect method works—but has risks: Disconnecting the battery can reset the light, but it may also erase radio settings and adaptive learning data.
- Check gas cap first: A loose or faulty gas cap is a common cause of the check engine light on the 2019 Traverse and is easy to fix.
- Monitor after reset: After clearing the light, drive the vehicle for a few days to ensure the issue doesn’t return.
- Seek professional help if needed: If the light comes back or you’re unsure of the cause, visit a certified mechanic or dealership.
- Prevent future issues: Regular maintenance like oil changes, air filter replacements, and fuel system checks can reduce the chances of the light reappearing.
How to Dismiss Check Engine Light on 2019 Traverse
If you’ve noticed the check engine light glowing on your 2019 Chevrolet Traverse dashboard, you’re not alone. This warning light can appear for a variety of reasons—some minor, others more serious. While it’s tempting to want to turn it off immediately, it’s important to understand what’s causing it before taking action. In this guide, we’ll walk you through the safest and most effective ways to dismiss the check engine light on your 2019 Traverse, including when to DIY and when to call in the pros.
By the end of this article, you’ll know how to read diagnostic codes, reset the light using an OBD2 scanner, and even try alternative methods like disconnecting the battery. We’ll also cover common causes, troubleshooting tips, and how to prevent the light from coming back.
Why Is the Check Engine Light On?
Visual guide about How to Dismiss Check Engine Light on 2019 Traverse
Image source: dashboardwarninglights.com
Before you try to dismiss the check engine light, it’s crucial to know why it’s on in the first place. The 2019 Traverse uses an onboard diagnostics system (OBD2) that monitors engine performance, emissions, and other critical systems. When something goes outside normal parameters, the system triggers the check engine light and stores a diagnostic trouble code (DTC).
Common causes include:
- A loose or damaged gas cap
- Faulty oxygen (O2) sensor
- Mass airflow (MAF) sensor issues
- Catalytic converter problems
- Spark plug or ignition coil failure
- Evaporative emissions system leaks
Ignoring the root cause and simply resetting the light can lead to decreased fuel efficiency, increased emissions, or even engine damage over time.
Step 1: Check the Gas Cap
One of the easiest and most common fixes for the check engine light on a 2019 Traverse is the gas cap. A loose, cracked, or missing gas cap can cause a small leak in the fuel system, triggering the light.
How to Inspect the Gas Cap
- Turn off the engine and allow it to cool.
- Open the fuel door and unscrew the gas cap.
- Check for cracks, worn seals, or damage.
- Ensure the cap clicks when tightened—this indicates a proper seal.
- If the cap is damaged, replace it with an OEM or compatible aftermarket cap.
After tightening or replacing the cap, drive the vehicle for 50–100 miles. The light may turn off on its own if the issue was minor. If it remains on, proceed to the next step.
Step 2: Use an OBD2 Scanner to Read the Code
The most accurate way to diagnose the problem is by using an OBD2 scanner. These devices plug into the diagnostic port under the dashboard and read the trouble codes stored in the vehicle’s computer.
Locating the OBD2 Port
The OBD2 port in the 2019 Traverse is typically located under the steering column, near the driver’s knees. It’s a 16-pin connector and should be easy to spot once you look for it.
How to Use an OBD2 Scanner
- Turn the ignition to the “ON” position (do not start the engine).
- Plug the OBD2 scanner into the port.
- Follow the scanner’s prompts to read the codes.
- Write down the code(s) displayed (e.g., P0455 for a large evaporative leak).
- Use the scanner’s built-in database or search online to interpret the code.
Many auto parts stores (like AutoZone or O’Reilly) offer free code reading if you don’t own a scanner. However, investing in a basic OBD2 scanner (around $20–$50) is worthwhile if you plan to maintain your vehicle yourself.
Step 3: Fix the Underlying Issue
Once you know the code, research the recommended fix. Some issues, like a loose gas cap, are simple. Others may require parts replacement or professional service.
For example:
- P0171 (System Too Lean): Could indicate a vacuum leak or faulty MAF sensor.
- P0420 (Catalyst System Efficiency Below Threshold): Often points to a failing catalytic converter.
- P0300 (Random/Multiple Cylinder Misfire): May be caused by bad spark plugs or ignition coils.
If you’re comfortable with basic repairs, you can replace parts like spark plugs or the gas cap yourself. For complex issues—especially those involving the catalytic converter or fuel injectors—it’s best to consult a mechanic.
Step 4: Clear the Check Engine Light
After addressing the issue, it’s time to dismiss the check engine light. There are two main methods: using an OBD2 scanner or disconnecting the battery.
Method 1: Clear the Light with an OBD2 Scanner
This is the recommended method because it’s safe, quick, and doesn’t affect other vehicle systems.
- Ensure the ignition is on (engine off).
- Plug in the OBD2 scanner.
- Navigate to the “Clear Codes” or “Erase DTCs” option.
- Confirm the action when prompted.
- The check engine light should turn off immediately.
Note: Some scanners may require you to turn the ignition off and back on after clearing.
Method 2: Disconnect the Battery (Alternative Method)
If you don’t have a scanner, you can try resetting the vehicle’s computer by disconnecting the battery. This method works because it cuts power to the engine control unit (ECU), forcing it to reset.
- Turn off the engine and remove the key.
- Open the hood and locate the battery.
- Use a wrench to loosen the negative (black) terminal clamp.
- Remove the negative cable and wait 15–30 minutes.
- Reconnect the cable and tighten the clamp.
- Start the vehicle and check if the light is off.
⚠️ Warning: Disconnecting the battery may reset radio presets, clock, and adaptive transmission settings. In some cases, it can also trigger other warning lights or require a drive cycle to relearn driving patterns.
Step 5: Monitor the Vehicle After Reset
Clearing the light doesn’t guarantee the problem is fixed. The check engine light can return if the underlying issue persists.
What to Do After Resetting
- Drive the vehicle for at least 50–100 miles under normal conditions.
- Pay attention to performance: rough idling, poor acceleration, or decreased fuel economy could indicate ongoing issues.
- If the light returns, recheck the codes and consider professional diagnosis.
Some vehicles require a specific “drive cycle” to complete system checks. For the 2019 Traverse, this typically includes:
- Starting the engine when cold
- Driving at varying speeds (city and highway)
- Idling for a few minutes
- Turning off the engine
Completing this cycle helps the ECU verify that repairs were successful.
Troubleshooting Common Issues
Even after following these steps, you might run into problems. Here’s how to handle common scenarios:
The Light Won’t Turn Off
If the check engine light remains on after clearing:
- Double-check that the issue was properly fixed.
- Ensure all connections (like the gas cap) are secure.
- Try clearing the code again with the scanner.
- If the light persists, the problem may be intermittent or require advanced diagnostics.
The Light Comes Back After a Few Days
This usually means the root cause wasn’t addressed. For example, replacing a gas cap won’t fix a failing O2 sensor. Recheck the codes and consider a professional inspection.
Other Warning Lights Appear
If the traction control, ABS, or service vehicle soon light comes on after a battery disconnect, don’t panic. These systems may need to relearn or reset. Drive the vehicle normally for a day or two. If lights persist, visit a service center.
When to See a Mechanic
While many check engine light issues can be resolved at home, some require expert attention. Seek professional help if:
- The light is flashing (indicates a severe misfire that can damage the catalytic converter)
- You’re unsure how to interpret or fix the code
- The vehicle is running poorly (rough idle, stalling, loss of power)
- The light returns repeatedly after reset
- You don’t have access to an OBD2 scanner
A certified Chevrolet technician can perform advanced diagnostics and ensure your Traverse is running safely and efficiently.
Preventing Future Check Engine Lights
The best way to avoid dealing with the check engine light is through regular maintenance:
- Replace the air filter every 15,000–30,000 miles
- Use high-quality fuel and consider fuel system cleaners
- Replace spark plugs and ignition coils as recommended (typically every 60,000–100,000 miles)
- Inspect hoses and vacuum lines for cracks or leaks
- Keep the gas cap tight and in good condition
Staying on top of these tasks can significantly reduce the chances of unexpected warning lights.
Conclusion
Dismissing the check engine light on your 2019 Traverse doesn’t have to be intimidating. By understanding the cause, using the right tools, and following a systematic approach, you can safely reset the light and keep your SUV running smoothly. Always start with the simplest fix—like checking the gas cap—and use an OBD2 scanner to get accurate diagnostic information. If the problem is beyond your skill level, don’t hesitate to consult a professional.
Remember, the check engine light is there to protect your vehicle. Ignoring it can lead to costly repairs down the road. But with the knowledge from this guide, you’re now equipped to handle it confidently and correctly.