Resetting the check engine light on your 2017 Chevy Impala can be done manually or with an OBD2 scanner. This guide walks you through both methods, explains why the light comes on, and helps you avoid common mistakes. Always fix the underlying issue first before resetting the light to prevent it from returning.
Key Takeaways
- Never ignore the check engine light: It signals a problem with your engine, emissions, or fuel system that needs attention.
- Fix the root cause first: Resetting the light without repairing the issue will only cause it to return.
- Use an OBD2 scanner for accuracy: This tool reads diagnostic trouble codes (DTCs) and safely clears the light.
- Manual reset methods may not work: Some 2017 Impalas require a scanner; disconnecting the battery can cause other system resets.
- Drive cycle completion is essential: After resetting, drive normally for a few days so the car’s computer can complete self-tests.
- Keep records of repairs: Document what was fixed and when—this helps with future diagnostics and resale value.
- Seek professional help if unsure: If you can’t identify or fix the problem, visit a certified mechanic.
How to Reset Check Engine Light on 2017 Chevy Impala
If you’ve recently fixed an issue with your 2017 Chevy Impala—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 clear old error codes and start fresh.
In this comprehensive guide, you’ll learn how to reset the check engine light on a 2017 Chevy Impala using two reliable methods: with an OBD2 scanner and manually (though with limitations). We’ll also cover why the light comes on, what it means, and how to avoid common pitfalls. Whether you’re a DIY enthusiast or just want to save a trip to the mechanic, this guide will help you handle the process safely and effectively.
Understanding the Check Engine Light
Visual guide about How to Reset Check Engine Light on 2017 Chevy Impala
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Before jumping into the reset process, it’s important to understand what the check engine light actually means. The light—often labeled “Check Engine,” “Service Engine Soon,” or represented by an engine icon—is part of your car’s onboard diagnostic (OBD) system. When it illuminates, it means the vehicle’s computer has detected a problem that could affect performance, emissions, or fuel efficiency.
On the 2017 Chevy Impala, the check engine light can be triggered by dozens of issues, ranging from minor (like a loose gas cap) to serious (like a failing catalytic converter). The light doesn’t always mean immediate danger—sometimes it’s just a reminder to check something—but it should never be ignored.
The OBD2 system stores diagnostic trouble codes (DTCs) that pinpoint the issue. These codes can only be read using a scan tool or code reader. Once the problem is fixed, the light won’t automatically turn off. You must reset it manually or with a scanner to clear the stored codes and allow the system to run new tests.
Why You Should Fix the Problem First
One of the biggest mistakes drivers make is resetting the check engine light without addressing the underlying issue. This is like turning off a smoke alarm while your kitchen is still on fire—it doesn’t solve the problem; it just hides it.
For example, if your Impala’s light came on because of a faulty mass airflow (MAF) sensor, simply resetting the light won’t fix the sensor. The problem will persist, and the light will likely return within a few days—or worse, cause further damage to your engine or emissions system.
Always follow this sequence:
- Read the trouble codes using an OBD2 scanner.
- Diagnose and repair the issue.
- Reset the check engine light.
- Complete a drive cycle to confirm the fix.
Skipping step 2 can lead to repeated repairs, wasted money, and potential safety risks.
Method 1: Resetting with an OBD2 Scanner (Recommended)
The most reliable and accurate way to reset the check engine light on a 2017 Chevy Impala is by using an OBD2 scanner. This tool plugs into your car’s diagnostic port and communicates directly with the vehicle’s computer. It can read codes, clear them, and even monitor real-time data like engine temperature and fuel trim.
What You’ll Need
- An OBD2 scanner (basic code readers start around $20; advanced models cost $100+)
- Your 2017 Chevy Impala
- A safe, flat location to work (like a driveway or garage)
Step-by-Step Instructions
Step 1: Locate the OBD2 Port
The OBD2 port on the 2017 Chevy Impala is located under the dashboard, near the driver’s side knee area. It’s a 16-pin connector, usually black or gray, and shaped like a trapezoid. You may need to crouch down or use a flashlight to find it. It’s typically within arm’s reach when you’re seated in the driver’s seat.
Step 2: Turn Off the Ignition
Make sure the car is completely off. Do not start the engine. The ignition should be in the “OFF” position. This prevents any electrical interference while connecting the scanner.
Step 3: Plug in the OBD2 Scanner
Insert the scanner’s plug into the OBD2 port. It should fit snugly—don’t force it. Once connected, the scanner may power on automatically, or you may need to press a button to turn it on.
Step 4: Turn the Ignition to “ON” (Do Not Start the Engine)
Turn the key to the “ON” position (or press the Start button without pressing the brake). This powers up the car’s electrical systems and allows the scanner to communicate with the computer. The dashboard lights will illuminate, but the engine should remain off.
Step 5: Follow the Scanner’s Menu
Most scanners have a simple menu system. Use the arrow buttons to navigate. Select “Read Codes” or “Scan” to view any stored trouble codes. Write down the codes (e.g., P0420, P0171) for reference—even if you’ve already fixed the issue, it’s good to confirm what triggered the light.
After reviewing the codes, select “Clear Codes” or “Erase DTCs.” The scanner will ask for confirmation. Press “Yes” or “OK” to proceed.
Step 6: Wait for Confirmation
The scanner will display a message like “Codes Cleared” or “Reset Successful.” This means the check engine light has been reset. Some scanners may also show “No Codes” or “System OK” once the reset is complete.
Step 7: Turn Off the Ignition and Disconnect the Scanner
Turn the key back to “OFF” and unplug the scanner. Store it safely for future use.
Step 8: Start the Engine
Start your Impala. The check engine light should now be off. If it remains on, there may still be an active issue, or the system hasn’t completed its self-tests yet.
Tips for Using an OBD2 Scanner
- Choose a scanner with “Clear Codes” functionality—some basic models only read codes.
- If the light comes back on after resetting, re-scan for new codes—there may be multiple issues.
- Keep the scanner’s software updated for best performance.
- Store the scanner in a dry, cool place to avoid damage.
Method 2: Manual Reset (Limited Effectiveness)
Some drivers try to reset the check engine light manually by disconnecting the battery. While this method works on older vehicles, it’s less reliable on modern cars like the 2017 Chevy Impala. The car’s computer uses volatile memory that requires constant power, but many systems now have backup power or non-volatile memory that retains codes even when the battery is disconnected.
Still, if you don’t have a scanner, this method is worth trying—but with caution.
What You’ll Need
- Wrench or socket set (usually 10mm)
- Safety gloves and glasses
- 15–30 minutes of time
Step-by-Step Instructions
Step 1: Turn Off the Engine and Remove the Key
Make sure the car is off and the key is out of the ignition. This prevents any electrical surges.
Step 2: Locate the Battery
Open the hood and find the battery. On the 2017 Impala, it’s on the driver’s side, near the front of the engine bay.
Step 3: Disconnect the Negative Terminal
Use a wrench to loosen the nut on the negative (–) battery terminal. It’s usually black and marked with a minus sign. 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
This allows the car’s computer to lose power and reset. Some sources recommend waiting up to an hour, but 15–30 minutes is usually sufficient.
Step 5: Reconnect the Negative Terminal
Reattach the cable to the negative terminal and tighten the nut securely. Make sure it’s snug to ensure good electrical contact.
Step 6: Start the Engine
Turn the key and start the car. The check engine light may be off—but there’s no guarantee.
Why This Method May Not Work
- The 2017 Impala’s computer may retain codes in non-volatile memory.
- Disconnecting the battery resets other systems (radio presets, clock, seat memory), which can be inconvenient.
- If the underlying issue isn’t fixed, the light will return quickly.
When to Avoid This Method
Avoid disconnecting the battery if:
- You have a security system or anti-theft feature that may trigger.
- Your car has adaptive learning systems (like transmission shift points) that will need to relearn after a reset.
- You’re not comfortable working with car electronics.
Completing the Drive Cycle
After resetting the check engine light, your 2017 Chevy Impala needs to complete a “drive cycle” so the onboard computer can run its self-diagnostic tests. These tests check emissions, fuel system, and engine performance. Until they’re complete, the car may not pass an emissions test, and some monitors will show as “not ready.”
A typical drive cycle for the Impala includes:
- Cold start: Let the engine cool overnight, then start it.
- Idle for 2–3 minutes.
- Drive at 30–40 mph for 5–10 minutes.
- Accelerate to 55–60 mph and maintain speed for 5 minutes.
- Decelerate without braking (coast in gear).
- Repeat city and highway driving for 20–30 minutes total.
Complete this cycle over 2–3 days of normal driving. Once all monitors are “ready,” the system confirms no active issues.
Troubleshooting Common Issues
Even after resetting the light, you might run into problems. Here’s how to handle them:
Check Engine Light Comes Back On
If the light returns within a few days, the original issue wasn’t fully resolved. Re-scan for codes and double-check your repair. Common recurring issues include:
- Faulty oxygen sensors
- Evaporative emissions leaks (EVAP system)
- Catalytic converter problems
- Spark plug or ignition coil failures
Scanner Won’t Connect
If your OBD2 scanner doesn’t power on or connect:
- Check the fuse for the OBD2 port (usually in the under-hood fuse box).
- Ensure the ignition is in the “ON” position.
- Try a different scanner or update the software.
Radio or Clock Reset After Battery Disconnect
This is normal. Reprogram your radio presets and reset the clock. Some Impalas may require a security code to restore the radio—check your owner’s manual.
“Not Ready” for Emissions Test
If you’ve recently reset the light, the monitors may not be ready. Complete the drive cycle as described above. Most states allow one or two “not ready” monitors during testing, but it’s best to have all systems ready.
When to See a Mechanic
While resetting the check engine light is something most drivers can do at home, some situations require professional help:
- You can’t identify the trouble code or its meaning.
- The repair involves complex components (like the catalytic converter or transmission).
- The light flashes (indicating a severe misfire that can damage the engine).
- You’re uncomfortable performing diagnostics or repairs.
A certified mechanic has advanced tools and training to diagnose and fix issues quickly. They can also perform a professional reset and verify that all systems are functioning properly.
Final Tips for Maintaining Your 2017 Chevy Impala
To reduce the chances of the check engine light coming on:
- Use high-quality fuel and change the oil regularly.
- Replace the air filter every 15,000–30,000 miles.
- Check the gas cap—ensure it’s tight after every fill-up.
- Schedule routine maintenance as recommended in the owner’s manual.
- Address warning lights promptly—don’t wait.
Taking care of your Impala not only prevents check engine light issues but also extends the life of your vehicle and improves fuel efficiency.
Conclusion
Resetting the check engine light on your 2017 Chevy Impala is a straightforward process—if you follow the right steps. The best method is using an OBD2 scanner, which safely clears codes and confirms the reset. Manual methods like disconnecting the battery are less reliable and can cause other system resets.
Remember: always fix the problem first. Resetting the light without repairing the issue is a temporary fix that can lead to bigger problems down the road. Once the repair is complete, reset the light, complete a drive cycle, and monitor your car’s performance.
With the right tools and knowledge, you can handle this common automotive task confidently. Keep your scanner handy, stay proactive about maintenance, and your Impala will continue running smoothly for years to come.