Reset your 2015 Jeep Cherokee’s check engine light safely and effectively by using an OBD2 scanner—this ensures accurate code reading and proper system reset without risking ECU damage. Always address the underlying issue first, as simply clearing the light without diagnosis can lead to serious engine problems. For a reliable fix in 2026, follow up with a professional scan tool or trusted mechanic to confirm resolution before resetting.

How to Reset Check Engine Light on 2015 Jeep Cherokee in 2026

Key Takeaways

• Diagnose first: Always scan for error codes before resetting the light.
• OBD2 tool required: Use an OBD2 scanner to reset the light safely.
• Battery disconnect: Try disconnecting the battery for 15 minutes as a quick fix.
• Drive cycle matters: Complete a drive cycle after reset to ensure readiness.
• Check gas cap: A loose cap often triggers the light—tighten it first.
• Monitor after reset: Watch for recurring lights indicating unresolved issues.

Why This Matters / Understanding the Problem

You’re driving your 2015 Jeep Cherokee down the highway when—*ding*—the check engine light pops on. It’s not just an annoyance; it’s a warning. The light could mean anything from a loose gas cap to a serious engine misfire. But what if the issue is already fixed, and the light just won’t go away?

Knowing how to reset check engine light on 2015 Jeep Cherokee in 2026 is a must for any owner. Not only does it help clear false alarms, but it also ensures your vehicle passes emissions tests and avoids unnecessary mechanic visits. The good news? You don’t need to be a mechanic to do it.

The check engine light (CEL) is part of your Jeep’s onboard diagnostics (OBD-II) system. It monitors emissions, engine performance, and fuel system health. When a fault is detected, the system stores a diagnostic trouble code (DTC) and triggers the light. Resetting it clears the code—but only after the root cause is fixed.

Many drivers panic and rush to the dealership. But with the right tools and a little know-how, you can handle this yourself. Whether you’re prepping for a smog test or just tired of that glowing orange light, this guide walks you through the safest, most effective way to reset it—without risking your vehicle’s performance.

By learning how to reset check engine light on 2015 Jeep Cherokee in 2026, you save time, money, and stress. Plus, you gain confidence in understanding your vehicle’s health.

What You Need

Before you start, gather the right tools. The process is simple, but skipping a tool can lead to frustration or incomplete results. Here’s what you’ll need:

• OBD2 scanner – A must-have. It reads and clears diagnostic trouble codes. Look for one with Bluetooth (like BlueDriver or FIXD) or a standalone handheld unit. Avoid cheap knockoffs; they may not support all Jeep-specific codes.
• Fully charged battery or running engine – The scanner needs stable power. A weak battery can cause communication errors.
• Access to the OBD2 port – Located under the dashboard, near the driver’s knee. On the 2015 Cherokee, it’s just left of the steering column.
• Owner’s manual (optional) – Helpful for locating the port and understanding code meanings.
• Notebook or phone app – To jot down the DTC before resetting. This helps track recurring issues.
• Gas cap (if loose or damaged) – A common cause of CEL. Always check it first.

Optional but helpful: A code reader with live data lets you monitor engine parameters in real time. This is great for diagnosing intermittent issues.

Pro tip: Buy a scanner with Jeep-specific support. Generic readers may miss manufacturer-specific codes like “P060A” (control module performance).

Warning: Never reset the check engine light without first diagnosing the cause. Clearing the code won’t fix a faulty oxygen sensor or catalytic converter. Doing so can lead to engine damage, poor fuel economy, or failed emissions tests.

Step-by-Step Guide to How to Reset Check Engine Light on 2015 Jeep Cherokee in 2026

Step 1: Diagnose the Problem (Don’t Skip This!)

Resetting the light without fixing the issue is like putting tape over a smoke detector. The problem will return—and possibly worse.

• Start by reading the diagnostic trouble code (DTC) using your OBD2 scanner. Plug the scanner into the port under the dashboard.
• Turn the ignition to “ON” (don’t start the engine). Wait for the scanner to connect.
• Navigate to “Read Codes” or “Scan for DTCs.” The scanner will display a code like “P0171” (system too lean) or “P0456” (evaporative emissions leak).
• Write down the code. Use your phone to look it up or refer to your scanner’s app for a plain-English explanation.

Example: A “P0457” code means the gas cap isn’t sealing properly. Tighten it or replace it—then recheck.

This step is critical. If you reset the light without addressing the cause, you risk:

• Worsening engine performance
• Increased emissions
• Damage to the catalytic converter (a $1,000+ repair)

Only proceed to reset once the issue is resolved. For example, if the code was “P0455” (large evap leak), replace the gas cap and drive for 50 miles to see if the light stays off.

By diagnosing first, you ensure the how to reset check engine light on 2015 Jeep Cherokee in 2026 process is safe and effective.

Step 2: Fix the Root Cause

Now that you have the code, address the problem. Here are common issues and fixes for the 2015 Cherokee:

• Gas cap loose or damaged: Tighten it by turning clockwise until it clicks 3–4 times. If it’s cracked or warped, replace it with an OEM or high-quality aftermarket cap.
• Oxygen (O2) sensor failure: Common on high-mileage Cherokees. Replace the faulty sensor (usually bank 1, sensor 1). Costs $100–$300 for parts and labor.
• Mass airflow (MAF) sensor dirty: Clean it with MAF-safe cleaner. Don’t touch the delicate wires inside.
• Spark plugs worn: Replace every 60,000–100,000 miles. Use OEM Champion Iridium plugs for best results.
• Catalytic converter efficiency: If code P0420 appears, the cat may be failing. Get a professional diagnosis—don’t reset and ignore.

After fixing the issue, drive the Jeep for 50–100 miles under various conditions (city, highway, cold start). This allows the OBD system to run its self-tests.

Note: Some codes require multiple drive cycles to confirm the fix. Your scanner may show “pending” codes—these aren’t active yet but could return.

Once the problem is fixed and the light hasn’t returned, move to the next step. This ensures the how to reset check engine light on 2015 Jeep Cherokee in 2026 method is truly complete.

Step 3: Connect the OBD2 Scanner

With the issue resolved, it’s time to reset the light. But first, reconnect your scanner properly.

• Park on level ground, turn off the engine, and engage the parking brake.
• Locate the OBD2 port (under the dash, left of the steering column). Plug in your scanner. You’ll feel a click when it’s secure.
• Turn the ignition to “ON” (don’t start the engine). Wait 10–15 seconds for the scanner to power up and connect to the vehicle’s computer.
• On the scanner, select “Connect to Vehicle” or “Auto Scan.” Most modern scanners auto-detect the make and model.

Pro tip: If the scanner doesn’t connect, check the 12V outlet or try turning the key to “OFF” and back to “ON.” A weak battery can cause connection issues.

Once connected, navigate to “DTC” or “Read Codes.” You should see “No Codes” or “Codes Cleared” if the fix worked. If codes still appear, recheck your repair.

This step ensures the how to reset check engine light on 2015 Jeep Cherokee in 2026 process starts on solid ground.

Step 4: Clear the Codes

Now, reset the check engine light. But do it carefully.

• On your scanner, select “Clear Codes” or “Erase DTCs.” Confirm when prompted.
• Wait 10–30 seconds. The scanner will send a signal to the ECU (engine control unit) to erase stored codes.
• Turn the ignition to “OFF,” then unplug the scanner.

Important: Don’t start the engine yet. Wait 1–2 minutes. This allows the ECU to fully reset.

After waiting, start the engine. The check engine light should stay off. If it flashes or turns on immediately, a problem still exists.

Note: Some scanners have a “Readiness Monitors” feature. After clearing codes, these monitors reset to “Not Ready.” This is normal. Drive the Jeep for 3–5 days (including cold starts, accelerations, and highway speeds) to complete the monitors.

Why wait? Emissions tests require all monitors to be “Ready.” If they’re not, the test fails—even if the light is off.

By following this step, you ensure the how to reset check engine light on 2015 Jeep Cherokee in 2026 process is thorough and emissions-compliant.

Step 5: Verify the Reset

Don’t assume the light is gone for good. Verify it.

• Drive the Jeep for 3–5 days, covering at least 100 miles.
• Include different driving conditions: stop-and-go traffic, highway speeds, cold starts, and sudden accelerations.
• After the drive cycle, reconnect the scanner. Check if any codes return.
• Use the scanner to view “Readiness Monitors.” All should show “Ready” or “Complete.”

Example: If the “Catalyst Monitor” is “Not Ready,” drive on the highway for 15 minutes at 55–65 mph, then decelerate without braking.

If the light stays off and all monitors are ready, you’ve succeeded. If not, recheck the repair or consult a mechanic.

Bonus: Some scanners (like BlueDriver) let you check readiness remotely via app. Handy for busy drivers.

This step is the final check in the how to reset check engine light on 2015 Jeep Cherokee in 2026 process. It confirms the fix is permanent.

Step 6: Alternative Method (Battery Disconnect – Use with Caution)

Some drivers swear by disconnecting the battery to reset the light. But this method has risks.

• Turn off the engine and remove the key.
• Open the hood. Locate the battery (driver’s side, front of engine bay).
• Use a wrench to loosen the negative (-) terminal clamp. Remove the cable.
• Wait 15–30 minutes. This drains residual power from the ECU.
• Reconnect the negative cable and tighten it.
• Start the engine. The light should be off.

However, this method has downsides:

• Erases radio presets, clock, and seat memory.
• Resets adaptive systems (like throttle position). May cause rough idle for 10–20 miles.
• Doesn’t clear readiness monitors. You still need to drive 100+ miles.
• Can trigger new codes if done incorrectly.

Use this only as a last resort. For example, if your scanner fails and the light persists after a proven repair.

And remember: Always fix the root cause first. Disconnecting the battery won’t repair a bad O2 sensor.

This method is part of the broader how to reset check engine light on 2015 Jeep Cherokee in 2026 toolkit—but not the first choice.

Pro Tips & Common Mistakes to Avoid

Even with the right tools, small mistakes can ruin the reset. Here’s what to watch for:

Pro Tip: Always clear codes with the scanner—not just by disconnecting the battery. This ensures readiness monitors reset properly.

• Don’t ignore the code. A “P0300” (random misfire) could mean bad spark plugs, but it might also indicate a failing fuel pump. Resetting without diagnosis is dangerous.
• Use a quality scanner. Cheap $20 readers often fail to communicate with Jeep’s ECU. Invest in one with Jeep-specific code support.
• Check the gas cap first. It’s the #1 cause of CEL. Tighten it and drive 20 miles. If the light goes off, you’ve saved $100.
• Don’t reset before a smog test. In most states, clearing codes resets monitors to “Not Ready.” You’ll fail the test. Drive 100+ miles first.
• Monitor live data. Use your scanner to check O2 sensor voltages, MAF readings, or fuel trims. This helps spot hidden issues.
• Keep records. Note the code, date, repair, and mileage. This helps track recurring problems.

Warning: If the check engine light is flashing, do NOT drive the vehicle. A flashing light indicates a severe misfire that can damage the catalytic converter. Stop driving and get towed to a mechanic.

Another common mistake: Assuming “No Codes” means everything is fine. Some issues (like intermittent misfires) don’t store codes until they happen multiple times. Use live data to catch these.

Finally, remember that the how to reset check engine light on 2015 Jeep Cherokee in 2026 process is about safety, not just convenience. A properly reset light means your Jeep is running clean and efficiently.

FAQs About How to Reset Check Engine Light on 2015 Jeep Cherokee in 2026

Q: Can I reset the check engine light without a scanner?
A: Technically, yes—by disconnecting the battery. But it’s not recommended. You risk erasing settings and won’t clear readiness monitors. A $40 OBD2 scanner is a better investment.

Q: Why does the light come back after resetting?
A: The root cause wasn’t fixed. For example, if you cleared a “P0420” code but the catalytic converter is still failing, the light will return. Always diagnose first.

Q: How long does it take for readiness monitors to reset?
A: 3–5 days of mixed driving. The ECU needs to run self-tests under various conditions. A 100-mile trip with cold starts, accelerations, and highway speeds usually does it.

Q: Will resetting the light affect my Jeep’s performance?
A: No—if the issue is fixed. But if you reset without repairing a problem (like a bad O2 sensor), you’ll see reduced fuel economy, rough idle, and higher emissions.

Q: Can I reset the light at AutoZone or O’Reilly?
A: Yes! Most auto parts stores offer free code reading and clearing. But they won’t fix the issue. Bring your scanner to verify the repair first.

Q: What if the scanner says “No Communication”?
A: Check the OBD2 port for debris. Ensure the battery is charged. Try a different scanner. If it still fails, the ECU or wiring may be damaged—see a mechanic.

Q: Is it legal to reset the check engine light?
A: Yes—but only after fixing the problem. Resetting to hide a fault (e.g., before a smog test) is illegal in most states. Always repair first, then reset.

Final Thoughts

Knowing how to reset check engine light on 2015 Jeep Cherokee in 2026 empowers you as a car owner. It saves money, prevents unnecessary repairs, and keeps your Jeep running smoothly.

Remember: The key is diagnosis before resetting. A $40 OBD2 scanner pays for itself the first time you avoid a dealership visit. Tighten the gas cap, clean the MAF sensor, or replace spark plugs—simple fixes that often solve the problem.

After the fix, use your scanner to clear codes and verify readiness monitors. Drive normally for a few days. If the light stays off, you’ve succeeded.

And if the issue is complex (like a failing catalytic converter), don’t hesitate to consult a mechanic. Some repairs need professional tools and expertise.

Your 2015 Jeep Cherokee is a reliable SUV. With this guide, you can keep it that way—one check engine light at a time. Now, go grab that scanner and take control of your vehicle’s health. Safe driving!