What are the most common reasons why the check engine light in a Jeep comes on?
If the check engine light in your Jeep car comes on while you’re driving down the road, you’re probably worried. This warning is meant to get your attention so you can fix the problem right away. But this warning light in your Jeep can mean a variety of different things, making it hard to decipher.
In this guide, we’ll explain what the check engine light in your Jeep car means. We’ll show you what the flashing light means and explain why you should take it seriously. Our guide also explains the main causes, the best solutions, and answers some of the most frequently asked questions.
What does the check engine light mean in my Jeep?The check engine light is also known as the malfunction indicator light (MIL). This warning message comes on to alert you that there’s a problem with your vehicle. A host of sensors monitor vital vehicle systems and send a message to the computer if something goes wrong.
If something trips the computer, it will turn on the check engine light and set a code. This DTC can be read with a compatible scanner and you can look up its meaning using our trouble code library.
What does a flashing check engine light mean in my Jeep?A flashing check engine light indicates a serious fault that needs immediate attention. You should stop the vehicle immediately when the indicator light flashes and have the DTC read with a scanner.
Continuing to drive with the check engine light flashing can cause serious damage. This is different from a solid check engine light, which indicates anything from a minor fault to a major failure.
What are the common causes of a Jeep check engine light coming on?The check engine light comes on whenever the system sends an abnormal reading. Because of this, many issues can trigger the warning; however, the most common causes are a loose fuel cap, a faulty EGR valve, a faulty MAF sensor, a faulty oxygen sensor, a worn catalytic converter, or a faulty ignition coil.
1. Loose fuel cap
The fuel cap acts as a seal to prevent fuel vapors from entering. If the fuel cap is loose, cracked, or damaged, the EVAP system will detect a leak. Unfortunately, fuel caps need to be durable and can easily get left behind when refueling.
Even if the fuel cap is in good working order, refueling with the engine running can cause problems. If you remove the fuel cap, the engine may detect an error that indicates a leak. Therefore, it is best to only refuel after the engine is turned off.
2. Bad EGR valve
The exhaust gas recirculation (EGR) valve is a vital part of your Jeep’s exhaust system. When the EGR valve fails, it can cause several symptoms, including the check engine light coming on.
It can also lead to reduced power, increased emissions, and sometimes a knocking noise. It can also lead to reduced fuel economy.
3. Faulty MAF Sensor
The mass air flow sensor (MAF) measures the mass of air entering the engine intake. It sends a signal that tells the computer how much fuel to inject. When this sensor fails, the wrong air and fuel mixture enters the combustion chamber.
A faulty MAF sensor will turn on the check engine light in your Jeep. This puts more strain on the engine, resulting in poor performance and significantly reduced fuel consumption.
4. Faulty Oxygen Sensor
The oxygen sensor is also needed to regulate the fuel injected into the system. If the oxygen sensor isn’t working properly, the computer will make unnecessary adjustments. You may also experience problems like uneven acceleration, engine stalling, and poor fuel economy.
5. Worn Catalyst
Jeep catalytic converters are designed to refine exhaust gases and reduce their pollutant content. Chemical reactions occur inside the catalytic converter, making exhaust gases less harmful to the environment.
Over time, the catalyst inside the catalytic converter breaks down and can no longer perform its function. If you want to turn off the check engine light, the only solution is to replace the catalytic converter.
6. Faulty Ignition Coils
Your Jeep’s ignition system is designed to create a spark that ignites the fuel and air mixture. Ignition coils are part of this system and work in conjunction with the spark plugs.
Because ignition coils have to withstand a lot of heat and stress, they will eventually fail and cause the check engine light to come on. If the situation gets worse, it could cause your Jeep to not start at all.
How do I fix a check engine light on a Jeep? Without knowing the cause of the problem, it’s impossible to estimate what repairs will be needed to turn off the check engine light in your Jeep vehicle. However, there are some steps you can take to make the process easier.
Consider these suggestions:
1. Reading Error Codes
The best way to find out what’s wrong is to look at the codes on your computer. Plugging a compatible scanner into the OBD-II port under your steering wheel will tell you what’s going on.
You can pay a local mechanic to read the codes for you, or you can go to your local auto parts store and have them scan the codes for you for free.
2. Look up the code and solve the problem
A code contains a letter and a series of numbers. It might look like P0100. This alone might not give you enough information, so check our online error code library. The code will make it easier to figure out what’s wrong so you can fix it. If there are multiple codes, you can combine them to solve the puzzle.
3. Check the Fuel Cap
If you recently filled up your Jeep’s gas tank, your gas cap may not have been tightened properly. Take a moment to check it again and retighten it if necessary.
4. Check the Fluids
Check the Power Steering Fluid
Now is a good time to check all the fluids in your car. Check the oil level first. If the oil looks old and dirty, change the oil and filter. Don’t forget to check other fluids too. Transmission oil, coolant, and brake fluid are also important.
5. Consult an Expert
If you feel you lack the experience, there’s no need to try to figure out what’s wrong with your Jeep yourself. Instead, find a local mechanic who is familiar with the system. Find a mechanic who will give you a detailed quote so you know what to expect. For larger jobs, it’s a good idea to get multiple quotes.
Can I still drive my Jeep if my check engine light is on?When your check engine light comes on, you should have it inspected immediately. Do not continue driving your Jeep if the light is flashing. Run a code scanner to see what’s going on and fix the problem before it causes serious damage to vital components.
What does the amber check engine light mean on a Jeep?The check engine light indicates that the computer has detected a fault with your vehicle. It could be something small, like a fuel cap not installed properly, or something big, like engine failure. This is why you need to run a code scanner to see what the computer is saying. How do I repair a check engine light on a Jeep?
First, check for codes with a compatible scanner. These codes will tell you what’s wrong with your Jeep. Once repairs are complete, you can use a code scanner to turn off the check engine light. If it comes back on, you’ll need to check the system again. Can a low oil level cause the check engine light to come on? Yes, a low oil level can cause a drop in pressure and turn on the check engine light. If the light comes on, check the oil level and condition. If you need to add or change oil, do that and then turn off the check engine light to see if it comes on again.
How serious is it if the check engine light is on all the time? The check engine light can indicate a number of issues, from minor to serious. The only way to know for sure is to scan the system for codes and determine what’s wrong. However, if the check engine light starts flashing on your Jeep’s dashboard, you should stop driving immediately to prevent engine damage.
When an error occurs that causes the computer to read an abnormal value, the check engine light comes on. Addressing signs of a problem as soon as they appear can help prevent further damage.
If you don’t know how to fix a check engine light on your Jeep, contact a mechanic. It’s better to spend a little money and get help than to face serious repairs that could cost thousands of dollars because of neglected engine repairs.
