Resetting the check engine light on a 2016 Chevy Trax is possible after fixing the underlying issue. This guide walks you through manual methods, OBD2 scanner use, and battery disconnection—plus when to seek professional help.
Key Takeaways
- Always diagnose the problem first: The check engine light indicates a real issue—don’t just reset it without fixing the root cause.
- Use an OBD2 scanner for best results: This tool reads and clears trouble codes safely and accurately on your 2016 Trax.
- Battery disconnection is a temporary fix: While it may reset the light, it also erases radio settings and learned driving data.
- Drive cycle completion is essential: After resetting, drive normally so the vehicle’s computer can recheck systems and confirm repairs.
- Not all resets are permanent: If the problem persists, the light will return—don’t ignore recurring warnings.
- Keep records of repairs and codes: This helps mechanics and aids in future diagnostics or resale value.
- When in doubt, consult a professional: Complex emissions or engine issues require expert diagnosis and repair.
How to Reset Check Engine Light on 2016 Trax
If you’ve recently fixed an issue with your 2016 Chevrolet Trax and the check engine light is still glowing on your dashboard, you’re not alone. Many drivers assume that once a repair is made, the warning light will automatically disappear—but that’s not always the case. The vehicle’s onboard computer needs to be told (or reminded) that the problem has been resolved. This is where resetting the check engine light comes in.
In this comprehensive guide, you’ll learn everything you need to know about safely and effectively resetting the check engine light on your 2016 Trax. We’ll cover why the light comes on, how to diagnose the issue, and multiple methods to clear it—from using an OBD2 scanner to disconnecting the battery. You’ll also get practical tips, troubleshooting advice, and important warnings to avoid common mistakes.
Whether you’re a DIY enthusiast or just want to save a trip to the mechanic, this guide will empower you to take control of your vehicle’s health. Let’s get started.
Understanding the Check Engine Light
Visual guide about How to Reset Check Engine Light on 2016 Trax
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Before jumping into reset procedures, it’s important to understand what the check engine light actually means. On your 2016 Chevy Trax, this warning light—often labeled “Check Engine,” “Service Engine Soon,” or represented by an engine icon—is part of the vehicle’s onboard diagnostics system (OBD2).
When the engine control module (ECM) detects a problem with the engine, emissions system, or related components, it triggers the light and stores a diagnostic trouble code (DTC). These codes help identify the specific issue, such as a faulty oxygen sensor, loose gas cap, or misfiring cylinder.
The light can appear in two ways:
– Solid (steady) light: Indicates a minor issue that should be checked soon.
– Flashing light: Signals a serious problem, like a severe misfire that could damage the catalytic converter. In this case, stop driving and seek immediate repair.
Ignoring the light—even if the car seems to run fine—can lead to reduced fuel efficiency, increased emissions, and costly repairs down the road. That’s why diagnosing and fixing the root cause is the first and most critical step before attempting any reset.
Step 1: Diagnose the Problem First
You should never reset the check engine light without first identifying and addressing the underlying issue. Resetting the light without fixing the problem is like turning off a fire alarm while the house is still burning—it doesn’t solve anything.
Use an OBD2 Scanner to Read the Code
The most reliable way to diagnose the issue is by using an OBD2 scanner. These devices plug into the OBD2 port (usually located under the dashboard, near the driver’s knees) and communicate with your Trax’s computer to retrieve trouble codes.
Here’s how to do it:
- Turn off the ignition and locate the OBD2 port. On the 2016 Trax, it’s typically found beneath the steering column, close to the fuse box.
- Plug in the OBD2 scanner. Make sure it’s compatible with your vehicle (most modern scanners work with all OBD2-equipped cars from 1996 onward).
- Turn the ignition to the “ON” position (but don’t start the engine). This powers up the scanner and vehicle electronics.
- Follow the scanner’s prompts to read the trouble codes. The device will display a code like P0420 (catalyst system efficiency below threshold) or P0171 (system too lean).
- Write down the code(s) and use the scanner’s built-in database or an online resource (like OBD-Codes.com) to interpret what it means.
For example, a P0442 code often points to a small evaporative emissions leak—commonly caused by a loose or damaged gas cap. Tightening or replacing the cap may resolve the issue.
Common Causes of Check Engine Light on 2016 Trax
Based on common issues reported by Trax owners, here are some frequent culprits:
- Loose or faulty gas cap: One of the simplest fixes. Check that the cap is tight and the seal isn’t cracked.
- Oxygen (O2) sensor failure: These sensors monitor exhaust gases and can degrade over time.
- Mass airflow (MAF) sensor issues: A dirty or malfunctioning MAF sensor can cause poor fuel economy and rough idling.
- Spark plug or ignition coil problems: Can lead to misfires and reduced performance.
- Catalytic converter inefficiency: Often a result of long-term neglect or other unresolved issues.
- Evaporative emissions system leaks: Small leaks in the fuel vapor system can trigger codes.
Once you’ve identified and repaired the issue—whether it’s replacing a sensor, tightening the gas cap, or cleaning a component—you’re ready to reset the light.
Step 2: Choose the Right Reset Method
There are three main ways to reset the check engine light on a 2016 Trax:
1. Using an OBD2 scanner
2. Disconnecting the battery
3. Letting the vehicle complete a drive cycle (automatic reset)
Each method has pros and cons. Let’s explore them in detail.
Method 1: Reset Using an OBD2 Scanner (Recommended)
This is the most accurate and safest way to reset the check engine light. It ensures the system recognizes the repair and clears the stored codes properly.
Step-by-Step Instructions
- Ensure the repair has been completed and all components are properly installed.
- Plug the OBD2 scanner into the port under the dashboard.
- Turn the ignition to the “ON” position (engine off).
- Navigate the scanner menu to “Clear Codes” or “Erase DTCs.” Confirm the action when prompted.
- The scanner will communicate with the ECM and delete the stored trouble codes.
- Turn off the ignition and unplug the scanner.
- Start the engine. The check engine light should be off.
Tip: Some scanners also allow you to view live data (like engine temperature, fuel trim, and oxygen sensor readings). Use this feature to confirm the repair worked before clearing codes.
Method 2: Disconnect the Battery (Alternative Method)
If you don’t have an OBD2 scanner, disconnecting the battery can reset the vehicle’s computer. However, this method is less precise and comes with drawbacks.
Step-by-Step Instructions
- Turn off the engine and remove the key.
- Open the hood and locate the battery (on the driver’s side).
- Use a wrench to loosen the negative (-) terminal clamp. Always disconnect the negative cable first to avoid short circuits.
- Remove the negative cable and wait at least 15 minutes. This allows the vehicle’s capacitors to discharge and the ECM to reset.
- Reconnect the negative cable and tighten the clamp securely.
- Close the hood and start the engine. The check engine light should be off.
Important Notes:
– Disconnecting the battery resets not only the check engine light but also other systems. You may lose:
– Radio presets and anti-theft codes (you may need to re-enter a security code)
– Climate control settings
– Learned driving patterns (the ECM relearns idle speed, shift points, etc.)
– This method doesn’t always clear all codes, especially if the issue persists.
– It’s not recommended for vehicles with advanced electronics or security systems unless necessary.
Method 3: Drive Cycle Reset (Natural Clearance)
In some cases, the check engine light will turn off on its own after the vehicle completes a series of driving conditions known as a “drive cycle.” This allows the ECM to retest systems and confirm the problem is fixed.
What Is a Drive Cycle?
A drive cycle is a specific sequence of driving maneuvers that trigger the vehicle’s onboard diagnostics to run tests. For the 2016 Trax, a typical drive cycle includes:
- Cold start (engine off for at least 8 hours)
- Idle for 2–3 minutes
- Drive at varying speeds (25–55 mph) for 10–15 minutes
- Include acceleration, deceleration, and steady cruising
- Come to a complete stop and idle again
After completing the drive cycle, the ECM may automatically clear the code if no faults are detected. This process can take several days of normal driving.
Tip: Use an OBD2 scanner to check if monitors (like catalyst, oxygen sensor, and evaporative system) have completed. If they’re “ready,” the system has passed its tests.
Step 3: Verify the Reset Worked
After resetting the light, it’s crucial to confirm the issue is truly resolved.
Check the Dashboard
Start the engine and observe the dashboard. The check engine light should remain off. If it comes back on within a few minutes or after driving, the problem likely persists.
Use the OBD2 Scanner Again
Plug in the scanner and check for any new or stored codes. If no codes appear, the reset was successful. If codes return, further diagnosis is needed.
Monitor Vehicle Performance
Pay attention to how your Trax runs:
– Is it idling smoothly?
– Does it accelerate without hesitation?
– Is fuel economy improving?
Any unusual behavior suggests an unresolved issue.
Troubleshooting Common Reset Issues
Even after following the steps correctly, you might encounter problems. Here’s how to handle them.
The Light Comes Back On
If the check engine light returns after resetting, the original problem wasn’t fully fixed. Common reasons include:
– Incomplete repair (e.g., gas cap tightened but not replaced if damaged)
– Intermittent fault (sensor works sometimes, fails other times)
– Secondary issue triggered by the first problem
Solution: Re-scan for codes and inspect related components. Consider professional diagnosis if the issue is complex.
Scanner Won’t Clear Codes
Some scanners may fail to clear codes if:
– The ignition isn’t in the correct position
– The scanner isn’t compatible
– The ECM is in a “lockout” mode due to a serious fault
Solution: Ensure the scanner is OBD2-compliant and try again. If it fails, try a different scanner or method.
Battery Disconnection Didn’t Work
If disconnecting the battery didn’t reset the light, the ECM may have non-volatile memory that retains codes. This is common in newer vehicles.
Solution: Use an OBD2 scanner for a more reliable reset.
Radio or Settings Reset After Battery Disconnect
This is normal. To restore settings:
– Re-enter radio security code (check your owner’s manual or glove box for the code)
– Reprogram climate and infotainment preferences
– Allow the ECM to relearn driving patterns (drive normally for a few days)
When to Seek Professional Help
While many check engine light issues can be resolved at home, some situations require a certified mechanic:
– The light is flashing (indicates a severe misfire)
– Multiple codes appear, especially related to emissions or engine performance
– The vehicle runs poorly, overheats, or won’t start
– You’re unsure about the diagnosis or repair
A professional technician has advanced tools and expertise to perform a thorough inspection, especially for complex systems like the catalytic converter or transmission.
Preventing Future Check Engine Light Issues
An ounce of prevention is worth a pound of cure. Here’s how to reduce the chances of the check engine light coming on again:
Regular Maintenance
Follow the maintenance schedule in your owner’s manual:
– Change oil and filter every 5,000–7,500 miles
– Replace spark plugs and ignition coils as recommended (typically every 60,000–100,000 miles)
– Inspect and replace air and fuel filters when needed
Check the Gas Cap
After every fill-up, make sure the gas cap is tight. A loose cap is one of the most common causes of check engine lights.
Use Quality Fuel
Fill up at reputable stations to avoid contaminated fuel, which can damage sensors and injectors.
Address Warning Signs Early
If you notice reduced fuel economy, rough idling, or hesitation, don’t wait—get it checked. Early intervention prevents bigger problems.
Final Thoughts
Resetting the check engine light on your 2016 Chevy Trax is a straightforward process—but only after the underlying issue has been properly diagnosed and repaired. Using an OBD2 scanner is the most effective and reliable method, while battery disconnection can work in a pinch. Always verify the reset was successful and monitor your vehicle’s performance.
Remember, the check engine light is your car’s way of saying, “Hey, something’s not right.” Ignoring it can lead to expensive repairs and reduced safety. By taking a proactive approach—diagnosing, fixing, and resetting correctly—you’ll keep your Trax running smoothly for years to come.
With the knowledge from this guide, you’re now equipped to handle check engine light issues with confidence. Safe driving!