Resetting the check engine light on a 2016 Dodge Challenger is possible after fixing the underlying issue. This guide walks you through manual methods, OBD2 scanners, and battery disconnects to clear the light and ensure your ride runs smoothly.
Key Takeaways
- Identify the root cause first: Never reset the light without diagnosing the problem—ignoring it can lead to serious engine damage or failed emissions tests.
- Use an OBD2 scanner for best results: This tool reads error codes and safely clears the light while confirming the fix worked.
- Battery disconnect is a temporary fix: Disconnecting the battery may reset the light, but it also erases radio settings and adaptive memory.
- Driving cycle matters: After resetting, your car needs to complete a drive cycle so the onboard computer can re-check systems.
- Check gas cap regularly: A loose or faulty gas cap is a common cause of the check engine light—tighten or replace it if needed.
- Monitor warning lights post-reset: If the light returns, the issue wasn’t fully resolved—seek professional diagnosis.
- Keep records of repairs: Document what was fixed and when to help with future troubleshooting or resale.
How to Reset Check Engine Light on 2016 Dodge Challenger
So, your 2016 Dodge Challenger’s check engine light is on—again. It’s annoying, sure, but don’t panic. That little orange or yellow light on your dashboard isn’t just a decoration. It’s your car’s way of saying, “Hey, something’s not right under the hood.” The good news? Once you’ve fixed the problem, you can reset the light and get back to cruising with confidence.
In this guide, we’ll walk you through everything you need to know about resetting the check engine light on your 2016 Dodge Challenger. Whether you’re a DIY enthusiast or just want to save a trip to the mechanic, we’ve got you covered. We’ll explain why the light comes on, how to diagnose the issue, and the safest, most effective ways to reset it. Plus, we’ll share tips to prevent it from coming back. Let’s get started.
Why Is the Check Engine Light On?
Before you even think about resetting the light, you need to understand why it’s on in the first place. The check engine light—also called the malfunction indicator lamp (MIL)—is part of your car’s onboard diagnostics system (OBD2). It monitors everything from engine performance to emissions control.
Visual guide about How to Reset Check Engine Light on 2016 Dodge Challenger
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When a sensor detects something out of the ordinary, it sends a signal to the engine control unit (ECU), which then triggers the light. The issue could be minor—like a loose gas cap—or serious, like a failing oxygen sensor or catalytic converter.
Common causes for the check engine light on a 2016 Dodge Challenger include:
- Loose or faulty gas cap: This is the #1 culprit. If the cap isn’t sealed properly, fuel vapors escape, triggering the light.
- Oxygen (O2) sensor failure: These sensors monitor exhaust gases and help regulate fuel mixture. A bad sensor can hurt fuel economy and emissions.
- Mass airflow (MAF) sensor issues: This sensor measures how much air enters the engine. Dirt or damage can cause poor performance.
- Spark plug or ignition coil problems: Misfires can trigger the light and reduce power.
- Catalytic converter failure: This part reduces harmful emissions. If it’s clogged or damaged, performance drops and the light comes on.
- Evaporative emissions system leaks: Small leaks in the fuel vapor system can set off the light.
Ignoring the light can lead to reduced fuel efficiency, engine damage, or even a failed emissions test. So, don’t just reset it and hope for the best. Fix the problem first.
Tools You’ll Need to Reset the Check Engine Light
Resetting the check engine light doesn’t require a full mechanic’s toolkit, but having the right tools makes the job easier and safer. Here’s what you’ll need:
- OBD2 scanner: This is the most reliable tool. It plugs into your car’s diagnostic port and reads error codes. Many affordable models are available online or at auto parts stores.
- Socket wrench or screwdriver: Needed if you’re disconnecting the battery.
- Safety gloves and glasses: Always protect yourself when working under the hood.
- Owner’s manual: Your Challenger’s manual has specific info about the OBD2 port location and fuse box.
- Pen and paper: To write down error codes before clearing them.
If you don’t have an OBD2 scanner, don’t worry. Some auto parts stores (like AutoZone or O’Reilly) offer free code reading. But for long-term use, investing in a basic scanner is worth it.
Step-by-Step: How to Reset the Check Engine Light
Now that you know why the light is on and what tools you need, let’s get into the actual reset process. We’ll cover three methods: using an OBD2 scanner, disconnecting the battery, and driving to clear the light naturally. The scanner method is the best, but we’ll explain all options.
Method 1: Using an OBD2 Scanner (Recommended)
This is the safest and most accurate way to reset the check engine light. It lets you read the error code, confirm the fix, and clear the light properly.
Step 1: Locate the OBD2 Port
The OBD2 port on a 2016 Dodge Challenger is usually under the dashboard, near the driver’s side footwell. It’s a 16-pin connector, often black or gray. You might need to crouch down or use a flashlight to find it. It’s typically to the left of the steering column, just above the pedals.
Step 2: Plug in the Scanner
Turn off the engine, but leave the key in the “on” position (or press the start button without pressing the brake). This powers the electrical system without starting the car. Then, plug the OBD2 scanner into the port. Make sure it’s fully seated.
Step 3: Turn On the Scanner
Most scanners power on automatically when plugged in. If not, press the power button. Wait a few seconds for it to connect to the car’s computer.
Step 4: Read the Error Code
Use the scanner’s menu to select “Read Codes” or “Scan.” It will display one or more diagnostic trouble codes (DTCs), like P0455 (large evaporative leak) or P0171 (system too lean). Write these down. You can look them up online or use the scanner’s built-in code library.
Step 5: Fix the Problem
Based on the code, take action. For example:
- If it’s P0457 (loose gas cap), tighten or replace the cap.
- If it’s P0135 (O2 sensor heater circuit), you may need to replace the sensor.
- If it’s P0300 (random misfire), check spark plugs and coils.
Don’t skip this step. Resetting the light without fixing the issue is like turning off a fire alarm while the house is still burning.
Step 6: Clear the Codes
Once the problem is fixed, go back to the scanner menu and select “Clear Codes” or “Erase DTCs.” Confirm the action. The scanner will send a signal to the ECU to reset the check engine light.
Step 7: Verify the Reset
Turn off the ignition, wait 10 seconds, then restart the car. The check engine light should be off. If it comes back on, the issue wasn’t fully resolved—or a new one has appeared.
Method 2: Disconnecting the Battery (Alternative Method)
If you don’t have a scanner, you can try disconnecting the battery. This cuts power to the ECU, which may reset the system. But it’s not as reliable and has downsides.
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 electrical surges.
Step 2: Locate the Battery
The battery in a 2016 Dodge Challenger is under the hood, on the driver’s side. It’s a standard 12-volt lead-acid battery.
Step 3: Disconnect the Negative Terminal
Use a socket wrench or wrench to loosen the nut on the negative (-) terminal. It’s usually black and marked with a minus sign. Carefully remove the cable and tuck it away so it doesn’t touch the terminal.
Step 4: Wait 15–30 Minutes
This gives the ECU time to fully discharge and reset. Some people recommend waiting up to an hour for a complete reset.
Step 5: Reconnect the Battery
Reattach the negative cable and tighten the nut securely. Make sure it’s snug but don’t over-tighten.
Step 6: Start the Car
Turn the ignition on and start the engine. The check engine light may be off—but it might also come back on if the problem persists.
Important Note: Disconnecting the battery resets more than just the check engine light. It can erase radio presets, clock settings, and adaptive transmission memory. You may need to re-enter your radio code (found in the owner’s manual or glove box).
Method 3: Drive to Clear the Light (Natural Reset)
Sometimes, the check engine light will turn off on its own after the problem is fixed—especially if it was a minor issue like a loose gas cap. This is called a “drive cycle.”
The ECU runs self-tests during normal driving. If it detects no errors over several cycles, it may automatically clear the light.
What Is a Drive Cycle?
A drive cycle is a specific pattern of driving that allows the car’s computer to test all emissions systems. For a 2016 Dodge Challenger, a typical drive cycle includes:
- Starting the engine cold (not driven for at least 8 hours)
- Driving at 30–40 mph for 3–5 minutes
- Accelerating to 55–60 mph and cruising for 5–10 minutes
- Decelerating without braking hard
- Stopping and idling for 2–3 minutes
- Repeating the cycle 2–3 times
After completing the drive cycle, the check engine light may turn off. But this method isn’t guaranteed—especially for serious issues.
Troubleshooting Common Issues
Even after resetting the light, problems can pop up. Here’s how to handle common issues:
Check Engine Light Comes Back On
If the light returns shortly after resetting, the original problem wasn’t fixed—or a new one has developed. Use the OBD2 scanner to read the new code. Common reasons include:
- Intermittent sensor failure
- Loose wiring or connections
- Incomplete repairs
- Multiple related issues (e.g., bad O2 sensor causing catalytic converter damage)
Don’t ignore recurring lights. They can signal serious problems that get worse over time.
Scanner Won’t Connect
If your OBD2 scanner won’t connect, check these:
- Is the ignition on? The scanner needs power.
- Is the port clean? Dust or corrosion can block the connection.
- Is the scanner compatible? Make sure it works with 2016 vehicles.
- Try a different scanner or visit an auto parts store for a free scan.
Battery Disconnect Didn’t Work
If disconnecting the battery didn’t reset the light, it could mean:
- The ECU retained the code in memory
- The problem is still present
- The light is hardwired and requires a scanner to clear
In this case, use an OBD2 scanner for a proper reset.
Tips to Prevent the Check Engine Light from Coming Back
An ounce of prevention is worth a pound of cure. Here’s how to keep your Challenger running smoothly and avoid future check engine light scares:
- Check the gas cap regularly: After every fill-up, make sure it’s tight. Replace it if it’s cracked or worn.
- Use quality fuel: Cheap gas can contain contaminants that harm sensors and injectors.
- Follow the maintenance schedule: Replace spark plugs, air filters, and oxygen sensors as recommended (usually every 30,000–100,000 miles).
- Listen for unusual sounds: Knocking, pinging, or rough idling can signal engine problems.
- Watch fuel economy: A sudden drop in MPG can indicate a sensor or emissions issue.
- Keep the engine clean: Dirt and oil buildup can affect sensor performance.
When to See a Mechanic
While many check engine light issues can be handled at home, some require professional help. See a mechanic if:
- The light is flashing (this indicates a severe misfire that can damage the catalytic converter)
- You’re unsure how to fix the problem
- The light keeps coming back
- You notice performance issues like rough idling, stalling, or loss of power
- You don’t have the tools or confidence to diagnose the issue
A certified Dodge technician can run advanced diagnostics and ensure the repair is done right.
Conclusion
Resetting the check engine light on your 2016 Dodge Challenger isn’t just about turning off a warning—it’s about understanding your car’s health and taking action. Whether you use an OBD2 scanner, disconnect the battery, or complete a drive cycle, the key is to fix the underlying issue first. Ignoring the light can lead to bigger problems down the road.
With the right tools and a little know-how, you can reset the light safely and keep your Challenger running strong. Remember: a healthy engine means more power, better fuel economy, and fewer surprises on the road. So don’t wait—diagnose, fix, and reset with confidence.