In this guide, we will look at some of the most common problems that trigger the check engine warning on Chrysler vehicles.

You will also find step-by-step instructions and videos on how to use OBD-II scanners to diagnose Chrysler check engine light yourself. If your Chrysler Check Engine Light (CEL) is staying on or is flashing, don't panic!

What Does Chrysler Check Engine Light Mean?

chrysler check engine light

Chrysler check engine light comes on to warn the driver that something is wrong with one of the components in your car (in most cases the emission system).

Even if your Chrysler drives without any performance issues, do not ignore the engine light. If there are no engine noises, the engine doesn't shake or is not overheating, you can continue to drive with caution. Get the car diagnosed as soon as possible.

Check Engine Light Flashing

If your check engine light is flashing you should pull over as soon as it is safe to do so.

It is recommended to have the vehicle towed to avoid further damage to the engine and the catalytic converter.

Ignoring the check engine light can potentially cause problems to other systems.

For example, if the check engine light cames on because the engine is running too rich.

Not only will your fuel MPG decrease, but you will shorten the life of the catalytic converter which can be very expensive to repair.


If your Chrysler check engine light is on, pay attention to how your car is performing. In some cases, you may notice one or more of the following problems:

  • Rough idling
  • Poor acceleration
  • A decrease in MPG/fuel economy.
  • Engine shakes or runs rough
  • Engine overheating

The symptoms can vary depending on which component or sensor is malfunctioning.

Common Problems

Common problems that trigger Chrysler check, engine light:

  • Loose gas cap
  • Spark plugs
  • Ignition coil
  • Oxygen sensor
  • MAF sensor
  • Catalytic converter
  • EVAP leak
  • Vacuum leak

Without reading the codes, it is impossible to know why your Chrysler check engine light is on.

This is a very easy procedure that you can perform yourself, or have a mechanic or dealer perform for you.

How to Read Chrysler Check Engine Codes

Let's take a look at instructions on how to read and clear Chrysler check engine light(s).

For this procedure, you will need an OBD-II scanner.


  1. Turn on the ignition. Turn the key to position II. If your Chrysler has START/STOP feature, press the button TWICE without pressing the brake pedal.  All the dashboard lights will turn on. Do not start the engine. 

    turn on chrysler ignition to scan for codes
  2. Plug scanner into the OBD-II port Chrysler obd port location to read fault codes diagnostic trouble codes
  3. Read codes.  The next step is to read the codes. Now we are going to take a look at using various scan tools to diagnose Chrysler check engine light. 

These instructions work on 1996 and newer Chrysler vehicles including Chrysler models such as Town and Country, 300, 300M, 200, Aspen, Pacifica, Sebring, Voyager, PT Cruiser, Crossfire, LHS, Cirrus, 300C. First, we will take a look at the procedure.

Read codes, what's next?

Once you retrieve the fault code(s) from the ECU, it is time to research the problem.

Write down the code and search online to see if other Chrysler owners have had that problem and how they fixed it.

Quite often the solution for the same code can vary from make to make. If you don't find enough information, find a reliable mechanic who can give you a second opinion.

It is highly recommended that you get a second opinion from a mechanic before you replace parts.

While in most cases the fault code is all you need to determine the defective part, that's not always the case.

Loose Gas Cap

Chrysler check engine light on due to loose gas cap

One of the most common reasons that a Chrysler check engine light comes on is due to a loose gas cap. If that's the case, you will not notice any performance issues at all.

Check the gas cap and tighten it until you hear it click. Newer Chryslers do not have a gas cap at all but they have what is called a capless design.

You can continue to operate the car unless the check engine light is flashing.

How Does Chrysler Check Engine Light Work?

Chrysler check engine

The ECU monitors various sensors mounted on the engine block, intake, and exhaust such as temperature, airflow, and O2 sensors.

If an anomaly is determined or a sensor is operating out of range it stores a fault code in the Engine Control Unit (ECU).

These codes are known as Diagnostic Trouble Codes (DTC) often referred to as fault codes.

Retrieving the fault code from the ECU is the first procedure that is performed to find why the check engine light is on. This can be performed by a mechanic, Chrysler dealer, or yourself.

Your Chrysler dealer will diagnose the check engine light codes free of charge if the vehicle is under warranty.

If your Chrysler is not under warranty, you will have to pay (in most cases) when you take your car to the dealer or auto mechanic.

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Member since 2020-09

Wow what an excellent article. The check engine light came on in my Chrysler Pacifica and I was very worried that it was going to cost me a lot. Tighten the gas cap and the light went off. Keep these articles up.