Resetting the check engine light on a 2015 Dodge Challenger can be done manually or with an OBD2 scanner. This guide walks you through both methods, explains when it’s safe to reset the light, and offers troubleshooting tips to prevent it from returning.
Key Takeaways
- Understand why the light came on: The check engine light signals a problem detected by your car’s onboard diagnostics system. Always diagnose the issue before resetting.
- Use an OBD2 scanner for accuracy: A scanner reads trouble codes and safely resets the light without risking damage to your vehicle’s computer.
- Manual reset is possible but not recommended: Disconnecting the battery can reset the light, but it may also erase important settings and require relearning procedures.
- Clear codes only after repairs: Resetting the light without fixing the underlying issue will cause it to return—and may lead to more serious problems.
- Drive cycle completion is essential: After a reset, your car needs to complete a drive cycle so the onboard computer can retest systems and confirm repairs.
- Keep records of repairs and resets: Documenting what was done helps with future diagnostics and resale value.
- Seek professional help if unsure: If you’re not confident in diagnosing or repairing the issue, consult a certified mechanic.
How to Reset Check Engine Light on 2015 Dodge Challenger
If you’ve recently fixed an issue in your 2015 Dodge Challenger—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 stored trouble codes and start fresh.
In this guide, you’ll learn two reliable ways to reset the check engine light on your 2015 Dodge Challenger: using an OBD2 scanner (the recommended method) and manually by disconnecting the battery (a less ideal but sometimes necessary option). You’ll also discover when it’s safe to reset the light, what to do if it comes back on, and how to avoid common mistakes.
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 reset process confidently and correctly.
Understanding the Check Engine Light
Visual guide about How to Reset Check Engine Light on 2015 Dodge Challenger
Image source: dodgecheckenginelight.com
Before you reset the check engine light, it’s important to understand what it means. The check engine light—also known as the malfunction indicator lamp (MIL)—is part of your car’s onboard diagnostics system (OBD2). When a sensor detects something out of the ordinary—like a misfire, low fuel pressure, or an emissions issue—it sends a signal to the engine control unit (ECU), which then triggers the light.
On a 2015 Dodge Challenger, the check engine light can illuminate for dozens of reasons, ranging from minor (a loose gas cap) to serious (a failing catalytic converter). The light may flash or stay steady. A flashing light usually indicates a severe problem that could damage the engine if ignored, while a steady light often means a less urgent issue.
Resetting the light without addressing the root cause is like turning off a fire alarm while the fire still burns. It might make you feel better temporarily, but the danger remains. That’s why diagnosis comes first.
When Should You Reset the Check Engine Light?
You should only reset the check engine light after you’ve:
- Identified the trouble code using an OBD2 scanner
- Diagnosed the underlying issue
- Completed the necessary repairs
- Confirmed the fix works (e.g., tightened the gas cap, replaced a faulty sensor)
For example, if your scanner shows code P0457 (Evaporative Emission Control System Leak Detected – Large Leak), and you’ve replaced the gas cap and inspected the EVAP system, then it’s safe to reset the light.
However, if you reset the light without fixing the problem, it will likely come back on after a few drive cycles. Worse, you might miss a serious issue that could lead to expensive repairs down the road.
Tools You’ll Need
To reset the check engine light on your 2015 Dodge Challenger, you’ll need one of the following:
- OBD2 Scanner: A handheld device that plugs into your car’s diagnostic port. Basic models cost $20–$50 and can read and clear codes. Advanced scanners offer live data and more detailed diagnostics.
- Smartphone with OBD2 App: If you have a Bluetooth or Wi-Fi OBD2 adapter (like BlueDriver or FIXD), you can use your phone to read and clear codes via an app.
- Basic Tools (for manual reset): A wrench or socket set to disconnect the battery (only if using the manual method).
We strongly recommend using an OBD2 scanner. It’s faster, safer, and gives you valuable diagnostic information.
Method 1: Resetting the Check Engine Light with an OBD2 Scanner
This is the most reliable and recommended way to reset the check engine light. It’s quick, safe, and gives you full control over the process.
Step 1: Locate the OBD2 Port
The OBD2 port on a 2015 Dodge Challenger 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 behind a small cover. You don’t need tools to access it—just reach under the dash and look for the port.
Step 2: Plug in the OBD2 Scanner
Turn off the ignition, then plug the scanner into the OBD2 port. Make sure it’s fully inserted. Some scanners will power on automatically when connected; others require you to turn the ignition to the “ON” position (without starting the engine).
Step 3: Turn the Ignition to “ON”
Turn the key to the “ON” position. The dashboard lights should illuminate, but the engine should remain off. This powers the ECU and allows the scanner to communicate with the vehicle’s computer.
Step 4: Read the Trouble Codes
Follow the scanner’s instructions to read the trouble codes. Most scanners have a “Read Codes” or “Scan” button. Press it, and the device will retrieve any stored diagnostic trouble codes (DTCs).
For example, you might see codes like:
- P0171 – System Too Lean (Bank 1)
- P0302 – Cylinder 2 Misfire Detected
- P0441 – Evaporative Emission Control System Incorrect Purge Flow
Write down the codes and research them using the scanner’s built-in database or an online resource like OBD-Codes.com. This helps you understand what’s wrong before resetting.
Step 5: Repair the Issue
Based on the code, perform the necessary repair. For instance:
- If the code is P0455 (large EVAP leak), check the gas cap, EVAP hoses, and purge valve.
- If it’s P0300 (random misfire), inspect spark plugs, ignition coils, and fuel injectors.
- If it’s P0171 (lean condition), look for vacuum leaks or a faulty mass airflow (MAF) sensor.
Once the repair is complete, proceed to the next step.
Step 6: Clear the Codes
On your scanner, select “Clear Codes” or “Erase DTCs.” Confirm the action when prompted. The scanner will send a command to the ECU to delete the stored trouble codes and turn off the check engine light.
Step 7: Verify the Reset
Turn the ignition off, wait 10–15 seconds, then turn it back to “ON.” Check the dashboard—the check engine light should be off. If it’s still on, the issue may not be fully resolved, or the ECU hasn’t completed its self-test.
Step 8: Complete a Drive Cycle
After clearing the codes, your Challenger needs to complete a drive cycle so the onboard computer can retest all systems. A typical drive cycle includes:
- Start the engine and let it idle for 2–3 minutes (cold start)
- 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)
- Stop and idle for 1–2 minutes
This process allows the ECU to monitor emissions, fuel trim, and other parameters. If no new codes appear after the drive cycle, the reset was successful.
Method 2: Manually Resetting the Check Engine Light (Battery Disconnect)
If you don’t have an OBD2 scanner, you can reset the check engine light by disconnecting the battery. This method forces the ECU to reset by cutting power, but it comes with risks and drawbacks.
Step 1: Turn Off the Ignition
Make sure the key is out of the ignition and all accessories (lights, radio, etc.) are turned off.
Step 2: Locate the Battery
The battery in a 2015 Dodge Challenger is under the hood on the driver’s side. It’s housed in a black plastic box with a red positive (+) terminal and a black negative (–) terminal.
Step 3: Disconnect the Negative Terminal
Use a wrench or socket to loosen the nut on the negative (black) battery cable. Carefully remove the cable from the terminal and tuck it away so it doesn’t touch the battery.
Step 4: Wait 15–30 Minutes
Leave the battery disconnected for at least 15 minutes. This allows the ECU and other modules to fully discharge and reset. Some recommend waiting up to 30 minutes for a complete reset.
Step 5: Reconnect the Battery
Reattach the negative cable to the battery terminal and tighten the nut securely. Make sure the connection is tight to avoid electrical issues.
Step 6: Turn the Ignition On
Turn the key to “ON” (without starting the engine). The check engine light should be off. If it’s still on, the issue may not be resolved, or the ECU hasn’t completed its reset.
Step 7: Start the Engine and Complete a Drive Cycle
Start the engine and let it idle for a few minutes. Then drive the car as described earlier to complete a drive cycle.
Important Notes About Manual Reset
- Data Loss: Disconnecting the battery can reset radio presets, clock, seat memory, and adaptive transmission settings. You may need to re-enter security codes for the radio.
- Relearning Required: The transmission and throttle body may need to relearn their positions. This can take several drive cycles.
- Not Always Effective: Some modern vehicles store codes in non-volatile memory, meaning they won’t clear even after a battery disconnect.
- Risk of Damage: Improper handling can cause electrical shorts or damage sensitive electronics.
Because of these risks, the manual method should only be used as a last resort.
Troubleshooting Common Issues
Even after resetting the check engine light, you might run into problems. Here’s how to handle common scenarios.
The Light Comes Back On
If the check engine light returns after a reset, it means the underlying issue wasn’t fully resolved. Possible causes include:
- Incomplete repair (e.g., gas cap not tightened properly)
- Intermittent fault (e.g., loose wiring or failing sensor)
- New problem triggered by the repair
Use your OBD2 scanner to read the new codes and diagnose accordingly.
The Light Won’t Turn Off
If the light remains on after a reset, the ECU may still detect a fault. Try:
- Double-checking all repairs
- Clearing codes again
- Completing multiple drive cycles
- Checking for pending codes (some scanners show these)
If the light persists, consult a mechanic.
Scanner Won’t Connect
If your OBD2 scanner won’t communicate with the car:
- Ensure the ignition is in the “ON” position
- Check that the scanner is compatible with your vehicle
- Inspect the OBD2 port for dirt or damage
- Try a different scanner or adapter
Battery Disconnect Didn’t Work
If disconnecting the battery didn’t reset the light:
- Wait longer (up to 30 minutes)
- Ensure all accessories were off during disconnect
- Try disconnecting both terminals (positive and negative)
- Use an OBD2 scanner instead
Tips for Preventing Future Check Engine Lights
While you can’t prevent all issues, you can reduce the chances of the check engine light coming on:
- Use quality fuel: Low-quality gas can cause misfires and sensor problems.
- Replace spark plugs on schedule: The 2015 Challenger typically needs new plugs every 60,000–100,000 miles.
- Keep the gas cap tight: Always tighten it until it clicks 3–4 times.
- Perform regular maintenance: Follow the owner’s manual for oil changes, air filter replacements, and inspections.
- Avoid short trips: Frequent short drives prevent the ECU from completing drive cycles, which can trigger false codes.
When to See a Mechanic
While many check engine light issues can be handled at home, some require professional attention. See a mechanic if:
- The light is flashing (indicates a severe misfire)
- You’re unsure how to diagnose or repair the issue
- The problem involves the transmission, catalytic converter, or engine internals
- Multiple codes appear simultaneously
- The light keeps returning after repairs
A certified Dodge technician has access to advanced diagnostic tools and factory service information, which can save time and prevent mistakes.
Conclusion
Resetting the check engine light on your 2015 Dodge Challenger is a straightforward process—if you do it the right way. Using an OBD2 scanner is the safest, most effective method. It allows you to read trouble codes, confirm repairs, and clear the light with confidence. While disconnecting the battery can work in a pinch, it comes with risks and may not always be successful.
Remember: the check engine light is there to protect your car. Always diagnose the problem before resetting. Once the issue is fixed, reset the light and complete a drive cycle to ensure the system passes all tests.
By following this guide, you’ll not only reset the light but also gain valuable insight into your Challenger’s health. Stay proactive with maintenance, keep your tools handy, and don’t ignore warning signs. Your car—and your wallet—will thank you.