Resetting the check engine light on your 2019 Ram 1500 doesn’t have to be confusing. This guide walks you through simple methods—from driving cycles to using an OBD2 scanner—so you can clear the light and ensure your truck runs smoothly.
Key Takeaways
- Understand why the light came on: The check engine light signals a problem detected by your truck’s onboard diagnostics system. Always diagnose the issue before resetting.
- Use an OBD2 scanner for best results: This tool reads error codes and safely clears the light after repairs are made.
- Try a driving cycle method: Some sensors reset automatically after completing specific driving patterns over several days.
- Disconnecting the battery is a last resort: It may reset the light but can also erase important vehicle settings and cause other issues.
- Monitor the light after reset: If it returns, the problem hasn’t been fixed—seek professional help.
- Regular maintenance prevents future warnings: Keep up with oil changes, air filters, and spark plugs to avoid recurring issues.
- Know when to see a mechanic: Persistent or severe codes (like P0300 for engine misfire) require expert diagnosis.
How to Reset Check Engine Light 2019 Ram 1500
If you’ve recently fixed an issue with your 2019 Ram 1500—like replacing a loose gas cap or fixing an oxygen sensor—you might be wondering how to reset the check engine light. That glowing orange or yellow icon on your dashboard can be unsettling, even if the problem is minor. The good news? Resetting it is often straightforward, especially if you’ve already addressed the root cause.
In this guide, we’ll walk you through several proven methods to reset the check engine light on your 2019 Ram 1500. Whether you’re a DIY enthusiast or just want to save a trip to the dealership, these steps will help you clear the warning and get back on the road with confidence. We’ll cover everything from using an OBD2 scanner to trying a simple driving cycle—and even discuss when disconnecting the battery might work (and why it’s not always the best idea).
But first, a quick reminder: **the check engine light is your truck’s way of saying something needs attention**. Resetting it without fixing the underlying issue is like turning off a smoke alarm while the fire still burns. So always diagnose the problem first. Once that’s done, resetting the light is the final step to confirm your repair worked.
Let’s dive in.
Why Does the Check Engine Light Come On?
Visual guide about How to Reset Check Engine Light 2019 Ram 1500
Image source: images.startmycar.com
Before we talk about resetting the light, it’s important to understand why it came on in the first place. The 2019 Ram 1500 uses an advanced onboard diagnostics system (OBD2) that constantly monitors engine performance, emissions, fuel system efficiency, and more. When a sensor detects an anomaly—like a drop in fuel pressure or a misfiring cylinder—the system logs a trouble code and triggers the check engine light.
Common causes include:
– Loose or faulty gas cap
– Oxygen (O2) sensor failure
– Mass airflow (MAF) sensor issues
– Spark plug or ignition coil problems
– Catalytic converter inefficiency
– Exhaust gas recirculation (EGR) valve malfunction
Some of these issues are minor and easy to fix (like tightening the gas cap), while others may require professional repair. That’s why diagnosing the code is the first and most crucial step.
Method 1: Use an OBD2 Scanner (Recommended)
The most reliable and safest way to reset the check engine light on your 2019 Ram 1500 is by using an OBD2 scanner. This handheld device plugs into your truck’s diagnostic port and communicates directly with the engine control unit (ECU). It can read trouble codes, provide detailed descriptions, and—most importantly—clear the codes and turn off the light.
Step 1: Locate the OBD2 Port
In the 2019 Ram 1500, the OBD2 port is usually located under the dashboard on the driver’s side. You’ll find it near the steering column, about knee-level. It’s a 16-pin connector, often covered by a small flap. If you can’t find it, check your owner’s manual—it’s typically labeled “DLC” (Data Link Connector).
Step 2: Plug in the OBD2 Scanner
Turn off the ignition, then plug the scanner into the port. Make sure it’s securely connected. Some scanners power on automatically when plugged in; others require you to turn the key to the “ON” position (without starting the engine).
Step 3: Read the Trouble Codes
Follow the scanner’s on-screen prompts to read the diagnostic trouble codes (DTCs). For example, you might see “P0457”—which indicates a large evaporative emission system leak, often caused by a loose gas cap. Write down the code(s) so you can research them later.
Step 4: Fix the Underlying Issue
Once you know the problem, address it. If it’s a loose gas cap, tighten it or replace it. If it’s an O2 sensor, you may need to install a new one. Only proceed to reset the light after the repair is complete.
Step 5: Clear the Codes
On most scanners, there’s a “Clear Codes” or “Erase DTCs” option. Select it, and the scanner will send a command to the ECU to reset the check engine light. The light should turn off immediately.
Step 6: Verify the Reset
Start your truck and check the dashboard. If the light stays off, the reset was successful. If it comes back on, the problem may not be fully resolved—or a new issue has emerged.
Pro Tip: Invest in a basic OBD2 scanner like the BlueDriver or Ancel AD310. They’re affordable (under $50), easy to use, and can save you hundreds in diagnostic fees.
Method 2: Complete a Driving Cycle
Sometimes, the check engine light turns off on its own after you’ve fixed the issue—especially if it was related to a sensor that needs time to recalibrate. This process is called a “driving cycle,” and it allows the truck’s computer to relearn operating conditions and confirm that everything is working properly.
The 2019 Ram 1500 may require a specific sequence of driving conditions to complete its self-tests. While the exact cycle can vary, a typical driving cycle includes:
Step 1: Cold Start
Start the engine when it’s completely cold (hasn’t been run for at least 8 hours). Let it idle for about 2–3 minutes.
Step 2: City Driving
Drive at speeds between 20–35 mph for about 5–10 minutes. Include some stops and starts to simulate normal traffic.
Step 3: Highway Driving
Accelerate to 55–65 mph and maintain that speed for at least 10 minutes. This helps the oxygen sensors and catalytic converter reach operating temperature.
Step 4: Deceleration
Let off the gas and coast to a stop without braking hard. Repeat this a few times.
Step 5: Repeat Over Several Days
Some monitors (like the evaporative system or catalyst monitor) take multiple drive cycles to complete. You may need to repeat this process over 3–5 days.
After completing the driving cycle, the check engine light may turn off automatically. You can verify this by checking the dashboard or using an OBD2 scanner to see if any codes remain.
Note: This method works best for minor issues like a loose gas cap or temporary sensor glitch. If the light persists, a scanner is still recommended.
Method 3: Disconnect the Battery (Use with Caution)
Disconnecting the battery is a traditional method to reset the check engine light, but it’s not always effective—and it comes with risks. When you disconnect the battery, the truck’s computer loses power, which can clear temporary memory and reset some systems. However, modern vehicles like the 2019 Ram 1500 have adaptive learning systems that may not fully reset this way.
Step 1: Turn Off the Engine and Accessories
Make sure the ignition is off, and all lights, radio, and accessories are turned off.
Step 2: Disconnect the Negative Terminal
Use a wrench to loosen the nut on the negative (black) battery terminal. Carefully remove the cable and tuck it away from the battery so it doesn’t accidentally reconnect.
Step 3: Wait 15–30 Minutes
Leave the battery disconnected for at least 15 minutes. This allows the ECU to fully discharge and reset. Some people recommend waiting up to 30 minutes for a more complete reset.
Step 4: Reconnect the Battery
Reattach the negative terminal and tighten it securely. Make sure the connection is clean and tight.
Step 5: Start the Truck
Turn the key and start the engine. The check engine light may be off—but be aware that other systems (like radio presets, clock, and seat memory) may also reset.
Warning: Disconnecting the battery can cause the truck’s computer to lose adaptive learning data, which may lead to rough idling or poor fuel economy for a few days. It also won’t clear all trouble codes—especially hard codes that require a scanner.
Method 4: Use the Ignition Key Cycle (Limited Effectiveness)
Some older vehicles allow you to reset the check engine light by turning the ignition key on and off in a specific sequence. While this method rarely works on modern trucks like the 2019 Ram 1500, it’s worth a try if you don’t have a scanner.
Step 1: Turn the Ignition to “ON”
Insert the key and turn it to the “ON” position (but don’t start the engine). Wait 3 seconds.
Step 2: Turn to “OFF”
Turn the key back to “OFF” and wait 3 seconds.
Step 3: Repeat Three Times
Repeat this on-off cycle three times in a row.
Step 4: Start the Engine
After the third cycle, start the truck. If the light was due to a temporary glitch, it might turn off.
Note: This method is largely outdated and unlikely to work on the 2019 Ram 1500. Use it only 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 resetting, the underlying issue hasn’t been fixed. Use an OBD2 scanner to read the new code and diagnose the problem. Common recurring issues include faulty oxygen sensors, catalytic converter problems, or persistent misfires.
The Light Flashes
A flashing check engine light indicates a severe problem—like a major engine misfire that can damage the catalytic converter. Pull over safely, turn off the engine, and have the truck towed to a repair shop.
No Codes Are Stored
Sometimes, the light turns on but no codes are present. This could mean the issue was intermittent or the sensor hasn’t triggered a hard code yet. Monitor the truck and recheck with a scanner after a few drive cycles.
Other Warning Lights Appear
If resetting the check engine light causes other warnings (like ABS or traction control), the battery disconnect may have disrupted system communication. Drive the truck for a few miles to allow systems to relearn, or visit a mechanic.
Preventing Future Check Engine Light Issues
The best way to avoid dealing with the check engine light is to maintain your 2019 Ram 1500 regularly. Here are some preventive tips:
– Check the gas cap: After every fill-up, make sure the cap is tight. A loose cap is one of the most common causes of the light.
– Replace air filters: A dirty air filter can reduce engine efficiency and trigger sensors.
– Use quality fuel: Low-octane or contaminated fuel can cause knocking and sensor errors.
– Schedule regular tune-ups: Replace spark plugs, ignition coils, and fuel injectors as recommended.
– Monitor dashboard warnings: Don’t ignore other lights like oil pressure or temperature.
When to See a Mechanic
While many check engine light issues can be resolved at home, some require professional help. See a certified mechanic if:
– The light is flashing
– You’re getting codes like P0300 (random misfire) or P0420 (catalyst efficiency below threshold)
– The truck is running rough, stalling, or losing power
– You’re unsure how to interpret the trouble codes
A professional diagnostic can save time and prevent further damage.
Conclusion
Resetting the check engine light on your 2019 Ram 1500 is a manageable task—especially if you’ve already fixed the problem. The most effective method is using an OBD2 scanner, which gives you accurate diagnostics and a clean reset. Driving cycles can help in some cases, while disconnecting the battery should be a last resort due to potential side effects.
Remember: the check engine light is there to protect your truck. Always diagnose the issue before resetting, and don’t ignore recurring warnings. With the right tools and knowledge, you can keep your Ram running smoothly and avoid unnecessary repair bills.
Now that you know how to reset the check engine light, you can tackle future warnings with confidence. Stay safe, stay informed, and happy driving!