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, or disconnecting the battery. Always diagnose the root cause first to avoid recurring issues and ensure your vehicle runs smoothly.
Key Takeaways
- Diagnose the issue first: Never reset the check engine light without identifying and fixing the underlying problem—otherwise, it will likely return.
- Use an OBD2 scanner for precision: This is the safest and most effective method to clear codes and reset the light on your 2013 Cadillac ATS.
- Driving cycles can auto-reset the light: After repairs, completing a proper drive cycle may allow the vehicle’s computer to turn off the light automatically.
- Battery disconnection is a last resort: While it can reset the light, it also erases radio settings, adaptive learning data, and may trigger other warnings.
- Check gas cap first: A loose or faulty gas cap is a common cause of the check engine light—tighten or replace it before trying other fixes.
- Monitor after reset: Drive your ATS for a few days and watch for the light to return, which could indicate an unresolved issue.
- Seek professional help if needed: If the light persists or you’re unsure about diagnostics, consult a certified mechanic or Cadillac dealer.
Introduction: Why Your 2013 Cadillac ATS Check Engine Light Is On
The check engine light on your 2013 Cadillac ATS can be alarming—especially if it comes on suddenly. But before you panic, know that this warning light is actually your car’s way of saying, “Hey, something needs attention.” It could be as simple as a loose gas cap or as serious as an engine misfire. The good news? Resetting the light is usually straightforward—but only after you’ve addressed the root cause.
In this guide, you’ll learn how to reset the check engine light on a 2013 Cadillac ATS safely and effectively. We’ll cover multiple methods, from using an OBD2 scanner to driving cycles and even battery disconnection. You’ll also get practical tips to avoid common mistakes and ensure the light stays off for good.
Whether you’re a DIY enthusiast or just want to save a trip to the mechanic, this step-by-step guide will empower you to take control of your vehicle’s health. Let’s get started.
Understanding the Check Engine Light: What It Means
Visual guide about How to Reset Check Engine Light on 2013 Cadillac Ats
Image source: dodgecheckenginelight.com
Before you reset the light, it’s crucial to understand what it’s trying to tell you. 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 a problem with the engine, emissions, or transmission, it sends a signal to the vehicle’s computer, which then illuminates the light.
On a 2013 Cadillac ATS, the light can appear in two ways:
– Solid (steady) light: Indicates a minor issue, such as a loose gas cap or faulty oxygen sensor.
– Flashing light: Signals a severe problem, like a catalytic converter failure or engine misfire, which can cause damage if ignored.
Ignoring a flashing light can lead to expensive repairs down the road. That’s why diagnosing the issue is the first and most important step—even before you think about resetting the light.
Step 1: Diagnose the Problem Before Resetting
You should never reset the check engine light without knowing why it came on. Doing so is like turning off a fire alarm without putting out the fire—it doesn’t solve the problem.
Use an OBD2 Scanner to Read the Code
The best way to diagnose the issue is by reading the diagnostic trouble code (DTC) stored in your car’s computer. Here’s how:
1. Locate the OBD2 port: In the 2013 Cadillac ATS, it’s usually under the dashboard on the driver’s side, near the steering column. It’s a 16-pin connector, often covered by a small flap.
2. Plug in the scanner: Turn off the ignition, then insert the OBD2 scanner into the port.
3. Turn the ignition to “ON”: Don’t start the engine—just turn the key to the second position (accessory mode).
4. Follow the scanner prompts: Most scanners will ask you to select your vehicle make, model, and year. Then, press “Read” or “Scan.”
5. Record the code: The scanner will display a code like P0420 or P0171. Write it down.
Interpret the Code
Once you have the code, use a free online database (like OBD-Codes.com) or the scanner’s built-in guide to understand what it means. For example:
– P0420: Catalyst system efficiency below threshold (likely a failing catalytic converter).
– P0171: System too lean (could be a vacuum leak or faulty oxygen sensor).
– P0455: Large evaporative emissions leak (often a loose gas cap).
Common Causes in the 2013 Cadillac ATS
Based on owner reports and service data, here are some frequent culprits:
– Loose or damaged gas cap
– Faulty mass airflow (MAF) sensor
– Oxygen (O2) sensor failure
– Spark plug or ignition coil issues
– Evaporative emissions system leaks
Addressing these issues before resetting the light ensures you’re not just masking a problem—you’re fixing it.
Step 2: Fix the Underlying Issue
Once you’ve identified the problem, take action. Here are some common fixes:
Tighten or Replace the Gas Cap
A loose gas cap is one of the most common reasons for the check engine light. Here’s what to do:
1. Turn off the engine and let the car cool.
2. Open the fuel door and unscrew the gas cap.
3. Check the rubber seal for cracks or wear.
4. Screw the cap back on until you hear it click 3–5 times.
5. If the cap is damaged, replace it with an OEM or high-quality aftermarket cap.
Replace a Faulty Oxygen Sensor
O2 sensors monitor exhaust gases and help the engine adjust fuel mixture. A failing sensor can reduce fuel efficiency and increase emissions.
– Locate the sensor (usually in the exhaust manifold or downpipe).
– Use an O2 sensor socket to remove it.
– Install a new sensor and reconnect the wiring harness.
Clean or Replace the Mass Airflow Sensor
A dirty MAF sensor can cause poor performance and trigger the check engine light.
– Remove the sensor (usually held by two screws).
– Spray it with MAF cleaner (do not touch the wires).
– Let it dry completely before reinstalling.
Address Ignition System Problems
Misfires often stem from worn spark plugs or faulty ignition coils.
– Replace spark plugs every 60,000–100,000 miles.
– Test ignition coils with a multimeter or swap them to see if the problem moves.
After making repairs, you’re ready to reset the check engine light.
Step 3: How to Reset the Check Engine Light on a 2013 Cadillac ATS
There are three main ways to reset the light. We’ll cover each in detail.
Method 1: Use an OBD2 Scanner (Recommended)
This is the most reliable and professional method. It clears the code and resets the vehicle’s readiness monitors.
1. Ensure the repair is complete: Double-check that the issue has been fixed.
2. Plug in the scanner: Connect it to the OBD2 port with the ignition off.
3. Turn the ignition to “ON”: Do not start the engine.
4. Navigate to “Clear Codes” or “Erase DTCs”: This option is usually in the main menu.
5. Confirm the reset: The scanner will ask if you’re sure—select “Yes.”
6. Wait for confirmation: The scanner will display “Codes Cleared” or similar.
7. Turn off the ignition and unplug the scanner.
After resetting, start the engine. The check engine light should be off. If it returns immediately, the problem may not be fully resolved.
Method 2: Complete a Drive Cycle
Sometimes, the vehicle’s computer will automatically turn off the light after you’ve fixed the issue and driven under specific conditions. This is called a “drive cycle.”
A typical drive cycle for the 2013 Cadillac ATS includes:
1. Cold start: Start the engine after it’s been off for at least 8 hours.
2. Idle for 2–3 minutes: Let the engine warm up.
3. Drive at 30–40 mph for 5 minutes: Maintain steady speed.
4. Accelerate to 55–60 mph: Hold for 3–5 minutes.
5. Decelerate without braking: Let the car slow down naturally.
6. Repeat city and highway driving: Combine stop-and-go with steady speeds for 20–30 minutes.
After completing the drive cycle, the computer may reset the light if all monitors pass. This can take 1–3 days of normal driving.
Method 3: Disconnect the Battery (Last Resort)
Disconnecting the battery can reset the check engine light, but it’s not recommended as a first option. It erases adaptive learning data, radio presets, and may trigger other warnings.
If you choose this method:
1. Turn off the engine and remove the key.
2. Locate the battery: In the 2013 ATS, it’s in the trunk on the right side, under a cover.
3. Disconnect the negative terminal: Use a wrench to loosen the clamp and remove the cable.
4. Wait 15–30 minutes: This allows the computer to fully reset.
5. Reconnect the terminal: Tighten it securely.
6. Start the engine: The light should be off.
Note: You may need to reset the radio, clock, and power windows. Also, the car may run rough for a few minutes as it relearns fuel trims.
Troubleshooting: What If the Light Comes Back On?
If the check engine light returns after resetting, don’t panic—but don’t ignore it either. Here’s what to do:
Re-scan for Codes
Use your OBD2 scanner to check for new or recurring codes. The same code returning suggests the repair wasn’t complete or the part failed again.
Check for Intermittent Issues
Some problems, like loose wiring or minor vacuum leaks, may not trigger a code immediately. Monitor driving behavior—rough idle, hesitation, or reduced fuel economy can offer clues.
Inspect Related Systems
For example, if you replaced an O2 sensor but the light returns, check the wiring harness or catalytic converter. A failing cat can damage new sensors.
Visit a Mechanic or Cadillac Dealer
If you’re unable to resolve the issue, seek professional help. Cadillac dealerships have advanced diagnostic tools and access to technical service bulletins (TSBs) specific to the 2013 ATS.
Preventing Future Check Engine Light Issues
An ounce of prevention is worth a pound of cure. Here’s how to keep your ATS running smoothly:
Perform Regular Maintenance
– Change oil every 5,000–7,500 miles.
– Replace air filters annually.
– Inspect spark plugs and ignition coils at recommended intervals.
Use Quality Fuel and Parts
– Fill up at reputable stations.
– Use OEM or high-quality aftermarket parts for repairs.
Check the Gas Cap After Every Fill-Up
– Make sure it’s tight and the seal is intact.
Monitor Vehicle Performance
– Pay attention to changes in sound, smell, or driving feel.
Conclusion: Take Control of Your Cadillac ATS
Resetting the check engine light on your 2013 Cadillac ATS doesn’t have to be intimidating. By diagnosing the problem first, fixing it properly, and using the right reset method, you can keep your car running efficiently and avoid unnecessary repairs.
Remember: The light is a warning, not a death sentence. With the right tools and knowledge, you can handle most issues yourself. But when in doubt, don’t hesitate to consult a professional.
Now that you know how to reset the check engine light on a 2013 Cadillac ATS, you’re equipped to maintain your vehicle with confidence. Stay proactive, stay informed, and enjoy the smooth, powerful ride your ATS was designed to deliver.