Why Is My Gas Cap Light On Jeep Wrangler? [Fixed]

We know how much it’ll concern you when you see a gas cap light on your Jeep Wrangler. Say you’re also facing this annoying issue & wondering why my gas cap light is on the Jeep Wrangler, then this guide is for you. 

The main reason behind the Jeep Wrangler gas cap light warning is because of loose or missing gas caps. Just locate the gas cap door and tighten it. If the problem isn’t resolved, there are other things you need to consider now.

Too little information, right? So, for a piece of detailed information about this matter, just stay with us till the end. We assure you; you’ll find all whatever you’re searching for!

Why Is My Gas Cap Light On Jeep Wrangler? 

It’s so annoying & concerning when you suddenly notice a gas cap light on your Jeep Wrangler. 

The gas cap light indicates several reasons. So, whenever you see a gas cap light, it’ll be for one of the following reasons.

1. Unsecured Gas Cap

Usually, you see the gas cap warning on your Jeep Wrangler whenever your computer detects any leak. 

Most times it happens because of the loosened or missing gas cap. Say there is no missing gas cap on your Jeep Wrangler. So, most probably it’ll be the loose gas cap. 

2. Clogged Gas Cap

If a loosened gas cap isn’t the case, another possibility is that of a clogged gas cap of your Jeep Wrangler. 

When your gas cap gets a grimy blockage, it becomes a reason behind the gas light warning. Because of the grimes, the gas cap can’t be seated properly in its holder. 

Besides, a gas cap warning message will come on if anything passes through the gas cap of your Jeep Wrangler. 

3. Old Gas Cap 

The old gas cap can be the other possible reason that your Jeep Wrangler gas light warning message can start manifesting. 

If you have looked up the before-mentioned reasons then it can mean that the lifetime of your gas cap is over. 

Usually, the gas cap lasts for about 50,000 miles. Every 50,000 miles you may have to replace the gas cap normally. 

For long-lasting gas caps, proper maintenance is always appreciable.

Other Possibilities 

Naturally, when the gas cap light warning issue is related to the gas cap, it’ll be gone soon if you make a correction to it. 

But if you still notice the gas cap light continuously then there can be other possible damage. There also can be leakage from some other system of your Jeep Wrangler. Here are the other possibilities behind gas cap light warnings. 

1. A Vacuum Leak 

As the vacuum system is responsible for many other functions in your Jeep Wrangler, a leak in the vacuum system can also lead to gas cap lighting. There also can be RPM surges due to it. 

2. Low Battery Level 

As you already know, a low battery level can affect almost all the functions of your Jeep Wrangler. 

So, in search of reasons for gas cap light warning messages, the battery level is also a considerable factor. 

3. Flawed Catalytic Converter 

The flawed catalytic converter can also be another reason for you to face the issue. 

A catalytic converter that has gone bad is a reason for your vehicle to overheat. 

4. Faulty Mass Airflow Sensor 

Mass airflow sensors usually help to adjust the various external functions of your Jeep Wrangler. 

If you face difficulty while starting your Jeep Wrangler or changing the throttle pedal, it can be the faulty mass airflow sensor. 

5. Bad Spark Plugs 

Another possibility can be that the spark plug of your Jeep Wrangler goes bad. 

Faulty or bad spark plugs reduce the engine performance & the production of engine power. 

6. Faulty O2 Sensor 

The O2 sensor is the thing that measures the oxygen amount of your jeep exhaust system. 

If the oxygen sensor becomes faulty it hampers the fuel system. Also, it eventually, damages the catalytic converter. 

7. Improper New Accessories Installation

Installation of new or servicing accessories is also an important factor to consider. Anyhow improper installation can hamper the functionality of your Jeep Wrangler. 

So, it’s always necessary for the proper installation of aftermarket accessories. 

How Do You Reset The Check Fuel Cap Warning?

Now all you the reasons behind the gas cap light warning, time to get the best & effective solutions to sort out the issue. Take a glance below- 

Method 1: Secure The Gas Cap 

As the gas cap light warning is mostly for the insecure gas cap, so your first step should be checking the gas cap. However, to do so- 

  • First, turn off your engine. 
  • Now push the gas cap door button to unlock it. You can find your gas cap door on the floorboard right next to the driver’s seat. 
  • Open the door & twist the gas cap handle. You should twist the gas cap handle clockwise to tighten them if it’s loosened.
  • Also, ensure all the threads are sealed properly. 
  • If needed, replace the gas cap. Twist the gas cap counterclockwise to loosen the old one. 
  • Thus, the old gas cap will be removed. Now install the new gas cap. A new gas cap will cost you on average $11.49 up to $84.99.

Method 2: Use OBD II Scanner 

If you can’t find the solution from the above method, you can resolve the fault by using the OBD II scanner. 

  • Plug the OBD II scanner into the OBD II port. The port will be under your steering column. 
  • Now press the reset button. The gas cap system will be clear as soon as you press the reset button of the OBD II scanner. 

Method 3: Call For A Professional 

If the gas cap light is still giving you a hard time, it’s the call for the professional. 

You can contact the mechanics & they will assist you in diagnosing the exact reason. They will provide you with a detailed inspection report of your Jeep Wrangler as well as take action accordingly. 

On average, the gas cap light inspection can cost you about $88 to $111. 

Frequently Asked Questions [FAQs]

For our dear readers, here we are going to highlight some of the most searched queries. You can take a look for a piece of quick information. 

Is it OK to drive with the gas cap light on?

Yes, it’s no problem driving while the gas cap light is on. You can drive safely when there is a gas cap light warning. 

How long after fixing the gas cap will the light go off?

If the gas cap light warning is due to the loosened gas cap, the warning will go off after several minutes. If that doesn’t happen, then your gas cap may need more servicing now. 

How do you know if your fuel cap is damaged?

If your gas cap isn’t tightened completely or keeps being loose, that is a sign of fuel cap damage. If the entire system is grimy or dirty, that also can be an indication of a bad fuel cap. 

Where is the gas cap sensor located?

The fuel tank pressure sensor is located on the top of the tank or inside the tank of your Jeep Wrangler. The gas cap sensor is a part of the EVAP or evaporative emissions system of your jeep. 


We’re about to end our discussion. We hope that the Jeep Wrangler gas cap light is no more confusing or annoying to you. 

Whatever the model of your Jeep Wrangler is, a gas cap light warning can be resolved by securing the loose gas cap. It’s indeed an easy fix. After correcting the gas cap light warning will go off. 

If the problem persists, you should get your Jeep Wrangler appraised by a qualified mechanic. A timely prognosis of the gas cap is always appreciable. 

That’s all! We heartily appreciate you being with us till the end.

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