Resetting the check engine light on your 2014 Chrysler 300 is quick and safe when done correctly—always diagnose the underlying issue first using an OBD2 scanner before attempting a reset. You can clear the light by either using a scan tool, disconnecting the battery (with precautions), or driving through a specific drive cycle, but only after repairs are made to avoid misleading diagnostics. Proper steps ensure your vehicle stays compliant and running smoothly.

How to 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300

Key Takeaways

• Diagnose first: Always identify the root cause before resetting the light.
• OBD2 scanner: Use it to clear codes safely and accurately.
• Battery disconnect: Temporarily cut power to reset the system manually.
• Drive cycle: Complete a proper drive to confirm the fix.
• Recurring light: Seek professional help if the light returns quickly.
• Preventive checks: Regularly inspect sensors and fluid levels to avoid issues.

Why This Matters / Understanding the Problem

The 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300 isn’t just about making that annoying yellow light disappear. It’s about understanding what your car is trying to tell you—and knowing when it’s safe to reset it.

That little engine-shaped light on your dashboard isn’t just a decoration. When it turns on, your Chrysler 300’s onboard computer (OBD-II system) has detected a problem with the engine, emissions, or related systems. Ignoring it can lead to costly repairs, reduced fuel economy, or even engine damage.

But here’s the catch: you should never reset the check engine light without first diagnosing the issue. Resetting it blindly is like turning off a fire alarm without checking for smoke. The 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300 walks you through the right way—diagnose first, fix the problem, then reset safely.

Whether your light came on after filling up with gas, or you’ve just completed a repair, this guide gives you the tools and know-how to handle it like a pro. We’ll cover safe reset methods, common causes, and how to avoid turning a small issue into a big repair bill.

Warning: Resetting the check engine light without fixing the underlying problem will likely cause the light to return—often with a more serious issue. Always diagnose first.

What You Need

Before you start, gather the right tools. The 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300 works best when you’re prepared. Here’s what you’ll need:

• OBD2 (OBD-II) code scanner – This is essential. You can’t diagnose the issue without reading the trouble codes. A basic Bluetooth or wired scanner (like the Autel AL519 or BlueDriver) works great. Avoid cheap knockoffs that give inaccurate readings.
• Smartphone or tablet (optional) – If using a Bluetooth scanner, you’ll need a compatible app (like Torque Pro or BlueDriver App).
• Owner’s manual – Keep it nearby for fuse box locations and battery disconnection steps.
• Wrench or socket set (optional) – Only if you plan to disconnect the battery. A 10mm or 13mm socket usually fits the battery terminals.
• Flashlight – Helps you see the OBD2 port under the dashboard.
• Pen and paper or phone notes – To write down the trouble codes and what they mean.

You don’t need to be a mechanic. These tools are affordable (under $30 for a basic scanner) and reusable for future car issues. Think of them as your car’s stethoscope.

Pro tip: Buy a scanner with live data and freeze frame features. These let you see exactly what the car was doing when the code triggered—like engine RPM, coolant temp, or oxygen sensor readings.

Step-by-Step Guide to 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300

Step 1: Understand Why the Light Is On

Before you reset anything, find out what’s causing the check engine light. Your 2014 Chrysler 300 stores trouble codes (called DTCs—Diagnostic Trouble Codes) that tell you exactly what’s wrong.

For example:
– P0455 = Large EVAP leak (loose gas cap)
– P0300 = Random misfire (bad spark plug or coil)
– P0171 = Lean fuel mixture (vacuum leak or dirty MAF sensor)

Don’t guess. Use your OBD2 scanner to pull the code. This is the foundation of the 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300—diagnose before you reset.

Tip: If the light is flashing, stop driving immediately. A flashing light means a severe misfire that can damage the catalytic converter.

Step 2: Locate and Connect the OBD2 Scanner

On your 2014 Chrysler 300, the OBD2 port is under the dashboard, near the driver’s left knee. It’s a 16-pin trapezoid-shaped plug—usually covered by a small plastic door.

To connect:

• Turn the ignition to “ON” (but don’t start the engine). All dashboard lights should come on.
• Plug the OBD2 scanner into the port. It should power up automatically.
• If using a Bluetooth scanner, pair it with your phone or tablet via the app.

Once connected, follow the scanner’s prompts to “Read Codes” or “Retrieve DTCs.” The process takes about 10–30 seconds.

Write down the code(s) and what they mean. Most scanners will show a brief description. For more detail, search the code online or use a repair database like Alldata or Mitchell1.

This step is crucial. The 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300 only works when you know the root cause.

Step 3: Fix the Problem (Don’t Skip This!)

Now comes the real work: fixing the issue. Here are common problems and quick fixes for your 2014 Chrysler 300:

• Loose gas cap (P0455, P0457): Tighten the cap until it clicks 3–5 times. Drive for 20–30 miles. The light may go off on its own.
• Bad spark plug or coil (P0300–P0308): Replace the faulty plug or coil. Use OEM or high-quality aftermarket parts (e.g., NGK, Denso).
• Dirty MAF sensor (P0171, P0174): Spray MAF cleaner on the sensor (never use brake cleaner or compressed air). Let it dry, then reinstall.
• EVAP purge valve (P0441): Test or replace the valve (located near the throttle body). A $20–$40 part.
• Oxygen sensor (P0135, P0141): Replace the sensor (front or rear). Use a specialty socket (22mm) to remove it.

Some fixes are DIY-friendly. Others may need a mechanic. But always fix the problem before resetting.

Warning: If you’ve just fixed the issue (e.g., replaced a part), drive the car for 1–2 days before resetting. The ECU needs time to run self-tests and confirm the fix worked.

Step 4: Reset the Check Engine Light (Three Methods)

Once the problem is fixed, you can reset the light. The 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300 offers three safe methods:

Method 1: Use the OBD2 Scanner (Recommended)

• With the scanner still connected, select “Clear Codes” or “Erase DTCs.”
• Confirm the action. The scanner will reset the ECU and turn off the light.
• Turn the ignition off, wait 30 seconds, then turn it back on. The light should stay off.

This is the cleanest, most reliable method. It also resets readiness monitors (needed for emissions testing).

Method 2: Disconnect the Battery (Old-School Fix)

• Turn the ignition off. Open the hood and locate the battery.
• Use a wrench to disconnect the negative (-) battery terminal.
• Wait 15–30 minutes. This drains residual power from the ECU.
• Reconnect the terminal. Tighten it securely.
• Turn the ignition to “ON” (no need to start). The light should be off.

Note: This method resets other systems too (clock, radio presets, seat memory). You’ll need to re-enter your radio code if required.

Method 3: Drive Cycle (Automatic Reset)

• After fixing the issue, drive the car for 50–100 miles under various conditions:
• 5–10 minutes of city driving (stop-and-go)
• 10–15 minutes of highway driving (steady 55–65 mph)
• One cold start (let the car sit overnight)
• The ECU will run self-tests. If all pass, the light turns off.

This method takes time but is useful if you don’t have a scanner. It’s also how dealerships reset lights after repairs.

Step 5: Verify the Light Stays Off

After resetting, don’t assume it’s fixed. Do a quick verification:

• Start the car. The light should not come on.
• Drive for 20–30 minutes, including highway speeds.
• Check again with the OBD2 scanner. Use “Read Codes” to confirm no codes returned.
• Look for readiness monitors (in the scanner). They should show “Ready” for most systems.

If the light comes back, the problem wasn’t fully fixed. Recheck the codes and repair again.

Tip: Some codes take time to reappear. If the light is off but you’re unsure, scan again after 2–3 days of driving.

Step 6: Prepare for Emissions Testing (If Needed)

If you live in a state with emissions testing (e.g., CA, NY, IL), your car must pass before the test. The ECU runs self-tests called “readiness monitors.”

After resetting:

• Complete a full drive cycle (as in Method 3).
• Use your scanner to check readiness status. All monitors should say “Ready” (not “Not Ready” or “Incomplete”).
• Some monitors (like EVAP) may take 2–3 days to complete.

If a monitor is still “Not Ready,” drive more. Don’t rush to the test center—your car will fail.

The 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300 ensures you’re not just turning off the light, but making your car emissions-compliant.

Pro Tips & Common Mistakes to Avoid

Even with the right tools, mistakes happen. Here’s how to avoid them:

Pro Tip 1: Always fix the root cause first. Resetting the light without fixing the problem is like treating a fever with aspirin but not the infection. It comes back.

Pro Tip 2: Use a quality OBD2 scanner. Cheap scanners may miss codes or give false readings. Invest in one with freeze frame data and readiness monitor checks.

Pro Tip 3: Don’t reset immediately after a gas cap fix. Drive 20–30 miles first. The ECU needs time to confirm the EVAP system is sealed.

Common Mistake 1: Disconnecting the battery too soon. Wait 15–30 minutes, not 2–3 minutes. Short disconnections don’t fully reset the ECU.

Common Mistake 2: Ignoring readiness monitors for emissions. In many states, you’ll fail the test if monitors are “Not Ready,” even if the light is off.

Common Mistake 3: Using the wrong gas cap. The 2014 Chrysler 300 requires a specific cap with a seal. Generic caps may leak and trigger P0455.

Common Mistake 4: Forgetting to clear pending codes. Some scanners show “pending” codes that don’t trigger the light. Clear them to ensure a clean slate.

Bonus: If you’re selling your car, resetting the check engine light (after repairs) can increase its value. Buyers want a clean OBD2 scan.

FAQs About 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300

Q1: Can I reset the check engine light without a scanner?

Yes, but only with the battery disconnect method. However, you won’t know if the problem is fixed. The 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300 recommends a scanner to avoid guesswork. A $20–$30 scanner is a smarter investment than a $500 repair.

Q2: How long does it take for the light to reset after a repair?

It varies. If you use a scanner, it’s instant. With the drive cycle method, it can take 1–3 days. The ECU needs time to run self-tests. For example, the EVAP monitor may need 2–3 cold starts to complete.

Q3: Will disconnecting the battery damage my car?

No, but it will reset the ECU, clock, radio presets, and seat memory. Some Chrysler models require a radio code after disconnection (check your manual). Always reconnect the terminals tightly to avoid electrical issues.

Q4: Can a loose gas cap really trigger the check engine light?

Yes! The EVAP system monitors for fuel vapor leaks. A loose or missing gas cap is the #1 cause of P0455 and P0457 codes. Tighten it until it clicks 3–5 times. If the light stays on, the cap seal may be worn.

Q5: What if the light comes back after resetting?

The problem wasn’t fully fixed. Scan for codes again. Common reasons: a new part failed, the repair was incomplete (e.g., dirty MAF sensor not cleaned properly), or a new issue arose. Don’t keep resetting—find and fix the root cause.

Q6: Do I need to reset the light before an emissions test?

Yes, but only after fixing the problem. The light must be off, and all readiness monitors must be “Ready.” If you reset without fixing, the light will return, and you’ll fail the test.

Q7: Can I use a free app to reset the light?

Only if it’s paired with a Bluetooth OBD2 scanner. Apps like Torque Pro or Car Scanner can read and clear codes—but you still need the hardware. Free apps without a scanner can’t do anything.

Final Thoughts

The 2026 Guide How to Reset Check Engine Light on 2014 Chrysler 300 isn’t just about turning off a light. It’s about car ownership with confidence. You’ve learned to diagnose, repair, and reset—the right way.

Remember: diagnose first, fix second, reset third. Skip any step, and you risk bigger problems. A $30 OBD2 scanner pays for itself the first time it prevents a misdiagnosis.

Keep your tools ready. Bookmark this guide. And next time that check engine light pops on, don’t panic—grab your scanner and take control. Your Chrysler 300 will thank you with smoother rides, better fuel economy, and fewer trips to the mechanic.

Actionable Tip: After resetting, scan your car every 3–6 months as part of routine maintenance. It’s like a free health check for your engine. Early detection saves money and headaches.

Drive safe, stay informed, and keep that dashboard clean!