This guide walks you through how to reset the check engine light on a 2013 Cadillac ATS using simple methods like driving cycles, OBD2 scanners, and battery disconnection. Always diagnose the root cause first to avoid recurring issues.
Key Takeaways
- Diagnose before resetting: Use an OBD2 scanner to read trouble codes and fix the underlying issue before clearing the light.
- Drive cycle method works: After repairs, complete a proper drive cycle to allow the vehicle’s computer to recheck systems and turn off the light naturally.
- OBD2 scanner is most reliable: A handheld scanner gives you control to clear codes instantly and confirms if the problem is resolved.
- Battery disconnection is a last resort: Disconnecting the battery can reset the light but may also erase radio settings and adaptive learning data.
- Light may return if issue persists: If the root cause isn’t fixed, the check engine light will come back on after reset.
- Use quality tools: Invest in a reliable OBD2 scanner compatible with GM vehicles for accurate readings and resets.
- Monitor after reset: Drive the car for a few days and watch for warning lights or performance issues to ensure the fix was successful.
How to Reset Check Engine Light 2013 Cadillac ATS
If you’ve noticed the dreaded check engine light glowing on your 2013 Cadillac ATS dashboard, you’re not alone. This warning light can appear for dozens of reasons—from a loose gas cap to a serious engine malfunction. While it’s tempting to ignore it or hope it goes away, the smart move is to address the issue and then reset the light properly.
In this comprehensive guide, you’ll learn exactly how to reset the check engine light on a 2013 Cadillac ATS using safe, effective methods. We’ll cover everything from diagnosing the problem to using an OBD2 scanner, performing a drive cycle, and even disconnecting the battery as a last resort. By the end, you’ll know not only how to turn off the light but also how to keep it off for good.
Let’s get started.
Why the Check Engine Light Comes On
Visual guide about How to Reset Check Engine Light 2013 Cadillac Ats
Image source: dashboardwarning.com
Before you reset the light, it’s important to understand why it came on in the first place. The check engine light—also known as the Malfunction Indicator Lamp (MIL)—is part of your car’s onboard diagnostics system (OBD2). When the vehicle’s computer detects a problem with the engine, emissions, or related systems, it stores a trouble code and illuminates the light.
Common causes in the 2013 Cadillac ATS include:
– Loose or faulty gas cap
– Oxygen (O2) sensor failure
– Mass airflow (MAF) sensor issues
– Catalytic converter problems
– Spark plug or ignition coil faults
– Exhaust gas recirculation (EGR) valve malfunction
– Evaporative emissions (EVAP) system leaks
Ignoring the light can lead to reduced fuel efficiency, increased emissions, and even engine damage over time. That’s why diagnosing the issue is the first and most critical step.
Step 1: Diagnose the Problem with an OBD2 Scanner
You can’t effectively reset the check engine light without knowing what triggered it. The best way to find out is by using an OBD2 scanner.
What Is an OBD2 Scanner?
An OBD2 scanner is a handheld device that plugs into your car’s diagnostic port and reads trouble codes stored in the vehicle’s computer. These codes—like P0420 or P0171—give you a clue about what’s wrong.
Where Is the OBD2 Port on a 2013 Cadillac ATS?
In the 2013 Cadillac ATS, the OBD2 port is located under the dashboard on the driver’s side, just above the pedals. It’s a 16-pin connector that’s easy to access once you kneel down and look up.
How to Use the Scanner
- Turn off the ignition.
- Plug the OBD2 scanner into the port.
- Turn the ignition to the “ON” position (but don’t start the engine).
- Follow the scanner’s instructions to read the codes.
- Write down the codes and look them up using the scanner’s manual or an online database.
For example, code P0420 means “Catalyst System Efficiency Below Threshold,” which often points to a failing catalytic converter. Code P0171 means “System Too Lean (Bank 1),” which could be due to a vacuum leak or faulty MAF sensor.
Recommended Scanners
Some reliable and user-friendly OBD2 scanners for the 2013 Cadillac ATS include:
– BlueDriver Bluetooth Pro: Works with your smartphone via Bluetooth and offers detailed diagnostics.
– Autel MaxiCOM MK808: A professional-grade tool with advanced features.
– Innova 3160g: Great for beginners, with a clear screen and code definitions.
Even a basic $20 scanner from Amazon can read and clear codes, making it a worthwhile investment for any car owner.
Step 2: Fix the Underlying Issue
Once you’ve identified the problem, it’s time to fix it. You can’t just reset the light and hope it stays off—if the issue isn’t resolved, the light will return.
Common Fixes for the 2013 Cadillac ATS
- Loose gas cap: Tighten it or replace it if cracked or damaged. This is the easiest and most common fix.
- O2 sensor replacement: Costs $100–$300 per sensor. You’ll need to locate the faulty sensor (usually near the exhaust manifold or catalytic converter) and replace it.
- MAF sensor cleaning or replacement: Use MAF cleaner spray to clean the sensor. If it’s dirty, cleaning may solve the problem. If not, replacement costs $150–$400.
- Spark plugs and ignition coils: Replace worn spark plugs (every 60,000–100,000 miles) or faulty coils. Coils typically cost $50–$150 each.
- EVAP system leak: Check hoses and the purge valve. A smoke test can help locate small leaks.
If you’re not comfortable doing the repair yourself, take your car to a trusted mechanic. Bring the trouble codes with you—they’ll save time and money.
Step 3: Reset the Check Engine Light
After fixing the issue, you’re ready to reset the check engine light. There are three main methods: using an OBD2 scanner, performing a drive cycle, or disconnecting the battery. Let’s go through each one.
Method 1: Use an OBD2 Scanner (Recommended)
This is the fastest and most reliable way to reset the light.
- Plug the scanner into the OBD2 port.
- Turn the ignition to “ON.”
- Navigate to the “Clear Codes” or “Erase DTCs” option on the scanner.
- Confirm the action. The scanner will send a command to the car’s computer to clear all stored trouble codes.
- Turn off the ignition and unplug the scanner.
After resetting, start the car. The check engine light should be off. If it comes back on immediately, the problem may not be fully resolved.
Method 2: Complete a Drive Cycle
Some issues require the vehicle’s computer to run self-tests before the light turns off. This is called a “drive cycle.” It’s a series of driving conditions that allow the onboard diagnostics system to recheck emissions and engine systems.
Here’s a typical drive cycle for the 2013 Cadillac ATS:
- Start the car cold (hasn’t been driven for at least 2 hours).
- Let it idle for 2–3 minutes.
- Drive at 30–40 mph for 3–5 minutes.
- Accelerate to 55–60 mph and maintain speed for 5–10 minutes.
- Decelerate slowly without braking hard.
- Repeat the cycle 2–3 times over the course of a day.
After completing the drive cycle, the computer may automatically clear the light if all systems pass inspection. This method works best for minor issues like a loose gas cap or temporary sensor glitch.
Method 3: Disconnect the Battery (Last Resort)
Disconnecting the battery can reset the car’s computer and turn off the check engine light. However, this method has drawbacks and should only be used if other methods fail.
Steps to Disconnect the Battery
- Turn off the ignition 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.
- Remove the negative cable and tuck it away from the battery.
- Wait 15–30 minutes. This allows the car’s computer to fully reset.
- Reconnect the negative cable and tighten the clamp.
- Start the car and check if the light is off.
Drawbacks of Battery Disconnection
– Resets radio presets, clock, and seat memory.
– May require reprogramming of adaptive transmission settings.
– Doesn’t guarantee the light stays off if the problem persists.
– Can trigger other warning lights temporarily.
Use this method only if you don’t have an OBD2 scanner and can’t complete a drive cycle.
Troubleshooting Common Issues
Even after resetting the light, you might run into problems. Here’s how to handle them.
The Light Comes Back On
If the check engine light returns after resetting, the underlying issue wasn’t fully fixed. Re-scan the codes and double-check your repair. Some problems, like a failing catalytic converter, may require professional diagnosis.
Scanner Won’t Connect
Make sure the ignition is on (but engine off) and the scanner is properly plugged in. Try a different scanner or check the OBD2 port for dirt or damage.
Car Runs Rough After Reset
This could mean the computer is relearning fuel trims and timing. Drive the car normally for 50–100 miles. If the problem persists, there may be a deeper mechanical issue.
Other Warning Lights Appear
Resetting the computer can temporarily trigger lights like “Service StabiliTrak” or “Traction Control Off.” These usually go away after a few drive cycles. If not, have the car scanned again.
Tips for Preventing Future Check Engine Lights
An ounce of prevention is worth a pound of cure. Here’s how to keep your 2013 Cadillac ATS running smoothly and avoid future check engine lights.
Regular Maintenance
Follow the maintenance schedule in your owner’s manual. Key items include:
– Oil changes every 7,500 miles (or as recommended)
– Air filter replacement every 15,000–30,000 miles
– Spark plug replacement every 60,000–100,000 miles
– Fuel system cleaning every 30,000 miles
Use Quality Fuel
Fill up at reputable gas stations. Low-quality fuel can cause carbon buildup and sensor issues.
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 the check engine light.
Monitor Performance
Pay attention to changes in fuel economy, engine noise, or drivability. Early detection can prevent bigger problems.
Keep an OBD2 Scanner Handy
Having a scanner in your glove box lets you check codes immediately when the light comes on.
Conclusion
Resetting the check engine light on your 2013 Cadillac ATS doesn’t have to be stressful. By following this guide, you’ve learned how to diagnose the problem, fix the root cause, and reset the light using safe, proven methods.
Remember: always diagnose before you reset. Using an OBD2 scanner is the best way to read trouble codes and clear them. If you’ve made a repair, give the car a proper drive cycle to let the computer recheck systems. And only disconnect the battery as a last resort.
With regular maintenance and attention to warning signs, you can keep your Cadillac ATS running smoothly and avoid unnecessary trips to the mechanic. Now that you know how to reset the check engine light, you’re in control—and that’s a powerful feeling.
Drive safe, stay informed, and keep that light off for good.