How to Reset Check Engine Light on 2013 Ram 1500

This guide walks you through how to reset the check engine light on a 2013 Ram 1500 using simple methods like driving cycles, OBD2 scanners, and battery disconnection. Always diagnose the root cause first to avoid recurring issues.

Key Takeaways

• Diagnose the problem first: Use an OBD2 scanner to read trouble codes before resetting the light—ignoring the issue can lead to engine damage or failed emissions tests.
• Drive cycle method works: After fixing the issue, complete a proper drive cycle (cold start, highway driving, stops) to allow the truck’s computer to recheck systems and turn off the light naturally.
• OBD2 scanner is the best tool: A handheld scanner lets you clear codes quickly and confirms if the problem is resolved—ideal for DIYers and mechanics alike.
• Battery disconnection is a last resort: Disconnecting the battery may reset the light temporarily, but it also erases radio settings, trip data, and adaptive learning—use only if other methods fail.
• Check gas cap first: A loose or faulty gas cap is a common cause of the check engine light—tighten or replace it before assuming a serious issue.
• Light may return if issue persists: Resetting without repair means the light will come back—always verify the fix with a post-reset scan.
• Professional help is wise for complex codes: If you see codes like P0300 (misfire) or P0420 (catalytic converter), consult a mechanic to avoid costly damage.

How to Reset Check Engine Light on 2013 Ram 1500

If you’re driving a 2013 Ram 1500 and that dreaded check engine light pops up on your dashboard, don’t panic—but don’t ignore it either. This warning light is your truck’s way of saying, “Hey, something’s not right under the hood.” While it might be something minor like a loose gas cap, it could also signal a more serious issue like a faulty oxygen sensor or engine misfire.

The good news? You can often reset the check engine light yourself—no need to rush to the dealership. In this complete guide, we’ll walk you through safe, effective methods to reset the check engine light on your 2013 Ram 1500. 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 of this guide, you’ll know exactly how to reset the light, understand why it came on in the first place, and prevent it from returning. Whether you’re a DIY enthusiast or just want to save money on mechanic visits, this step-by-step tutorial will give you the confidence to handle it yourself.

Why the Check Engine Light Comes On

Before you reset the light, it’s crucial to understand why it turned on in the first place. The check engine light—also known as the malfunction indicator lamp (MIL)—is part of your truck’s onboard diagnostics system (OBD2). This system constantly monitors engine performance, emissions, and other critical systems.

When a sensor detects an anomaly—like a drop in fuel efficiency, irregular engine combustion, or a problem with the exhaust system—it sends a signal to the engine control unit (ECU). The ECU then stores a diagnostic trouble code (DTC) and triggers the check engine light.

Common causes in a 2013 Ram 1500 include:

• Loose or damaged gas cap: This is the #1 culprit. A loose cap allows fuel vapors to escape, triggering an evaporative emissions code (like P0455).
• Faulty oxygen (O2) sensor: These sensors monitor exhaust gases. A failing sensor can reduce fuel economy and increase emissions.
• Spark plug or ignition coil issues: Misfires (code P0300-P0308) can damage the catalytic converter if left unchecked.
• Mass airflow (MAF) sensor problems: A dirty or failing MAF sensor can cause rough idling and poor acceleration.
• Catalytic converter failure: Often indicated by code P0420, this is a costly repair if ignored.
• Evaporative emissions system leaks: Small leaks in the fuel vapor system can trigger codes like P0442 or P0456.

Ignoring the light won’t make the problem go away—it could get worse. That’s why diagnosing the issue is the first and most important step.

Step 1: Diagnose the Problem with an OBD2 Scanner

You can’t fix what you don’t understand. Before resetting the check engine light, you need to know what’s causing it. That’s where an OBD2 scanner comes in.

What Is an OBD2 Scanner?

An OBD2 (On-Board Diagnostics, Generation 2) scanner is a handheld device that plugs into your truck’s diagnostic port. It reads the trouble codes stored in the ECU and displays them in plain language or as alphanumeric codes (like P0171).

Most 2013 Ram 1500 models have the OBD2 port located under the dashboard, near the driver’s side knee panel. It’s a 16-pin connector, usually black or gray, and easy to spot.

How to Use an OBD2 Scanner

Follow these steps to read the codes:

1. Turn off the engine. Make sure the truck is off and the key is removed.
2. Locate the OBD2 port. It’s typically under the steering column, about halfway down.
3. Plug in the scanner. Insert the scanner’s connector firmly into the port.
4. Turn the ignition to “ON” (but don’t start the engine). This powers up the scanner and the truck’s computer.
5. Follow the scanner’s prompts. Most scanners will ask you to select your vehicle make, model, and year. Choose “Ram” and “1500” for 2013.
6. Read the codes. The scanner will display one or more trouble codes. Write them down.
7. Turn off the ignition and unplug the scanner.

Interpreting the Codes

Once you have the codes, look them up online or in the scanner’s manual. For example:

• P0455: Large evaporative emissions leak—likely a loose gas cap.
• P0171: System too lean (Bank 1)—could be a vacuum leak or faulty MAF sensor.
• P0304: Cylinder 4 misfire—check spark plug or ignition coil.
• P0420: Catalyst system efficiency below threshold—possible catalytic converter issue.

Some scanners also provide a brief description and severity level. If you’re unsure, consult a repair manual or online forum like Ram Trucks Nation or JustAnswer.

Pro Tip: Use a Smartphone App

Many modern OBD2 scanners (like BlueDriver or FIXD) connect to your smartphone via Bluetooth. They offer detailed explanations, repair cost estimates, and even maintenance reminders. These are great for beginners who want more context.

Step 2: Fix the Underlying Issue

Now that you know what’s wrong, it’s time to fix it. Resetting the light without addressing the root cause is like putting a bandage on a broken bone—it won’t last.

Common Fixes for 2013 Ram 1500

• Gas cap: Tighten it until it clicks 3–5 times. If it’s cracked or the seal is worn, replace it with an OEM or high-quality aftermarket cap.
• O2 sensor: Located in the exhaust system, these can be replaced with basic tools. Expect to spend $50–$150 per sensor.
• Spark plugs: The 2013 Ram 1500 typically uses 5.7L HEMI V8 with coil-on-plug ignition. Replace spark plugs every 30,000–100,000 miles depending on type (copper, platinum, iridium).
• MAF sensor: Clean it with MAF cleaner spray (never touch the wires). If cleaning doesn’t help, replace it.
• Evaporative system: Check hoses for cracks or disconnections. Use a smoke test for hard-to-find leaks.

If you’re not comfortable doing the repair yourself, take your truck to a trusted mechanic. Bring the trouble codes with you—it saves time and money.

Step 3: Reset the Check Engine Light

Once the issue is fixed, you can reset the check engine light. There are three main methods: using an OBD2 scanner, performing a drive cycle, or disconnecting the battery. We’ll cover each in detail.

Method 1: Use an OBD2 Scanner (Recommended)

This is the fastest and most reliable way to reset the light.

1. Plug in the scanner. Follow the same steps as before to connect it to the OBD2 port.
2. Turn the ignition to “ON.” Don’t start the engine.
3. Navigate to “Clear Codes” or “Erase DTCs.” The exact wording varies by scanner.
4. Confirm the reset. The scanner will ask if you’re sure—select “Yes.”
5. Wait for confirmation. The scanner should display “Codes Cleared” or similar.
6. Turn off the ignition and unplug the scanner.

After resetting, start the engine. The check engine light should be off. If it comes back on within a few minutes, the problem may not be fully resolved.

Method 2: Perform a Drive Cycle

Some issues require the truck’s computer to run self-tests before the light turns off. This is called a “drive cycle.” It’s especially useful after fixing emissions-related problems.

A proper drive cycle for a 2013 Ram 1500 includes:

1. Cold start: Let the truck sit overnight. Start it when the engine is cold (below 95°F).
3. Idle for 2–3 minutes. Let the engine warm up gradually.
4. Drive at 30–40 mph for 5 minutes. This allows the oxygen sensors to warm up.
5. Accelerate to 55–60 mph and cruise for 10 minutes. This tests the catalytic converter and fuel system.
6. Decelerate without braking (coast). This helps the ECU monitor emissions during deceleration.
7. Stop and idle for 2 minutes.
8. Repeat the cycle 2–3 times over 2–3 days.

After completing the drive cycle, the check engine light should turn off if all systems pass inspection. This method can take a few days but is effective for emissions monitors.

Method 3: Disconnect the Battery (Last Resort)

Disconnecting the battery can reset the ECU and clear the check engine light, but it’s not ideal. It also resets other systems like radio presets, trip computer, and adaptive transmission learning.

1. Turn off the engine and remove the key.
2. Locate the battery. It’s under the hood, on the driver’s side.
3. Disconnect the negative terminal first. Use a wrench to loosen the clamp. Always remove the negative (black) cable before the positive (red) to avoid sparks.
4. Wait 15–30 minutes. This allows the ECU to fully discharge and reset.
5. Reconnect the negative terminal. Tighten it securely.
6. Start the engine. The check engine light should be off.

Note: In some cases, the light may return after a few drive cycles if the issue wasn’t fixed. Also, you may need to reset your radio and clock.

Troubleshooting Common Issues

Even after resetting, the check engine light might come back. Here’s how to troubleshoot:

Light Returns Immediately

If the light comes back within minutes of starting the engine, the problem is likely still present. Recheck your repair. For example, if you tightened the gas cap but the light returns, the cap may be damaged and need replacement.

Light Returns After a Few Days

This suggests the issue wasn’t fully resolved or the drive cycle wasn’t completed. Try repeating the drive cycle or using the OBD2 scanner to check for pending codes.

Multiple Codes Appear

If you see several codes, prioritize them. For example, a misfire (P0300) can cause a catalytic converter code (P0420). Fix the misfire first—the converter code may clear on its own.

Scanner Won’t Connect

Make sure the ignition is on, the scanner is compatible with OBD2, and the port isn’t damaged. Try a different scanner or check for blown fuses (usually under the dashboard or in the engine bay).

Light Flashes While Driving

A flashing check engine light indicates a severe misfire that can damage the catalytic converter. Pull over safely, turn off the engine, and call a tow truck. Do not continue driving.

Preventing Future Check Engine Lights

An ounce of prevention is worth a pound of cure. Here’s how to keep your 2013 Ram 1500 running smoothly:

• Use quality fuel: Stick to Top Tier gasoline to reduce carbon buildup.
• Replace spark plugs on schedule: Follow the manufacturer’s recommended interval (usually 100,000 miles for iridium plugs).
• Check the gas cap regularly: Make sure it’s tight after every fill-up.
• Use OEM or high-quality parts: Cheap sensors and caps can fail prematurely.
• Get regular maintenance: Oil changes, air filter replacements, and inspections can catch issues early.
• Monitor your scanner: Keep an OBD2 scanner in your glove box for quick checks.

When to See a Mechanic

While many check engine light issues are DIY-friendly, some require professional help. See a mechanic if:

• The light is flashing.
• You see codes related to the catalytic converter, transmission, or engine timing.
• The truck is running rough, stalling, or losing power.
• You’re unsure how to interpret or fix the code.
• The light keeps returning after multiple resets.

A certified mechanic has advanced tools and experience to diagnose complex issues quickly.

Conclusion

Resetting the check engine light on your 2013 Ram 1500 doesn’t have to be intimidating. By diagnosing the problem first, fixing the root cause, and using the right method—whether it’s an OBD2 scanner, drive cycle, or battery disconnect—you can clear the light safely and effectively.

Remember: the check engine light is a warning, not a death sentence. Treat it with respect, address the issue promptly, and your Ram will keep running strong for years to come.

Keep this guide handy, invest in a good OBD2 scanner, and don’t ignore that little orange light. With the right knowledge and tools, you’ve got this.