How to Check Engine Light on Chrysler

Discover how to check the engine light on your Chrysler vehicle with this easy-to-follow 2026 guide. We’ll walk you through reading error codes, understanding warning signs, and taking the right next steps—whether it’s a quick fix or a trip to the mechanic.

Key Takeaways

Understand what the check engine light means: It signals a problem with your engine or emissions system, ranging from minor to serious.
Use an OBD2 scanner for accurate diagnostics: This tool reads error codes stored in your Chrysler’s computer system.
Check common causes first: Loose gas caps, faulty oxygen sensors, or spark plug issues are frequent culprits.
Don’t ignore the light: Even if the car runs fine, unresolved issues can lead to costly repairs or reduced fuel efficiency.
Know when to visit a mechanic: If the light flashes or stays on after basic troubleshooting, professional help is needed.
Keep your vehicle maintained: Regular oil changes, air filter replacements, and tune-ups help prevent engine light issues.
Use Chrysler-specific resources: Some models have unique features—check your owner’s manual or Chrysler’s 2026 support portal for model-specific guidance.

How to Check Engine Light on Chrysler: A Complete 2026 Guide

So, you’re driving your Chrysler—maybe it’s a sleek 2026 Pacifica Hybrid, a rugged 300C, or a dependable Voyager—and suddenly, that little orange engine symbol lights up on your dashboard. Your heart skips a beat. Is it serious? Should you pull over? Can you fix it yourself?

Don’t panic. The check engine light is your car’s way of saying, “Hey, something’s not right—let’s take a look.” In this comprehensive guide, we’ll walk you through exactly how to check the engine light on your Chrysler in 2026, step by step. Whether you’re a seasoned DIYer or a first-time car owner, you’ll learn how to diagnose the issue, understand what the codes mean, and decide whether to fix it yourself or call a professional.

By the end of this guide, you’ll know how to use an OBD2 scanner, interpret error codes, perform basic troubleshooting, and keep your Chrysler running smoothly. Let’s get started.

What Does the Check Engine Light Mean?

Visual guide about How to Check Engine Light on Chrysler

Image source: autoseeks.com

Before diving into the how-to, it’s important to understand what the check engine light actually indicates. This warning light—often labeled “Check Engine,” “Service Engine Soon,” or simply an engine icon—is part of your vehicle’s onboard diagnostics system (OBD2), which has been standard in all cars since 1996.

When the light comes on, it means the car’s computer has detected a problem with the engine, transmission, or emissions system. The issue could be as simple as a loose gas cap or as serious as a failing catalytic converter.

There are two types of check engine lights:

Solid (steady) light: This usually indicates a non-urgent issue. Your car may still drive fine, but you should diagnose and fix the problem soon.
Flashing light: This is a red flag. It means there’s a severe problem—like a misfire that could damage the catalytic converter. You should stop driving and seek immediate help.

In 2026, Chrysler vehicles come equipped with advanced telematics and diagnostic systems. Some models even offer remote diagnostics through the Uconnect app, allowing you to check engine status from your smartphone. But even with smart features, knowing how to manually check the engine light gives you more control and peace of mind.

Step 1: Don’t Panic—Assess the Situation

The first step when the check engine light comes on is to stay calm. Panicking won’t fix the problem, but taking quick, smart action will.

Here’s what to do right away:

Check for Immediate Danger

Is the car shaking, making loud noises, or losing power? If yes, pull over safely and turn off the engine.
Is there smoke, a burning smell, or fluid leaking? These are signs of a serious issue—do not continue driving.
If the light is flashing, treat it as an emergency. Drive directly to a repair shop or call roadside assistance.

Note the Driving Conditions

Ask yourself:

Did the light come on after filling up with gas? (A loose gas cap is a common cause.)
Did it happen during cold weather or after a long drive?
Have you recently changed oil, replaced parts, or had maintenance done?

These details can help you or a mechanic pinpoint the issue faster.

Check the Gas Cap

This is the easiest fix—and one of the most common reasons for a check engine light. A loose, damaged, or missing gas cap can cause fuel vapors to escape, triggering the light.

Here’s how to check:

Turn off the engine.
Open the fuel door and unscrew the gas cap.
Inspect it for cracks, wear, or damage.
Screw it back on tightly—until you hear it click 3–5 times.
Drive for 50–100 miles. If the light turns off, the problem is solved.

If the light stays on, it’s time to dig deeper.

Step 2: Use an OBD2 Scanner to Read the Error Code

The most effective way to check the engine light on your Chrysler is by using an OBD2 (On-Board Diagnostics II) scanner. This device plugs into your car’s diagnostic port and reads the trouble codes stored in the engine control unit (ECU).

In 2026, OBD2 scanners are more advanced and user-friendly than ever. Many are Bluetooth-enabled and work with smartphone apps, giving you real-time data and clear explanations.

Where to Find the OBD2 Port

In most Chrysler models (including the 2026 Pacifica, 300, and Dodge Charger), the OBD2 port is located under the dashboard on the driver’s side. It’s usually within arm’s reach, near the steering column. It’s a 16-pin connector, often covered by a small flap.

If you can’t find it, check your owner’s manual—Chrysler provides a diagram for each model.

How to Use an OBD2 Scanner

Follow these steps:

Turn off the engine. This ensures a safe and accurate reading.
Plug in the scanner. Insert the OBD2 connector firmly into the port.
Turn the ignition to “ON” (but don’t start the engine). This powers up the car’s computer system.
Turn on the scanner. Most devices will power up automatically.
Follow the on-screen prompts. Select “Read Codes” or “Scan” from the menu.
Wait for the results. The scanner will display one or more diagnostic trouble codes (DTCs), such as P0420 or P0301.

Understanding the Codes

OBD2 codes follow a standard format:

The first character is a letter: P (Powertrain), B (Body), C (Chassis), or U (Network).
The next four digits specify the exact issue.

For example:

P0420: Catalyst system efficiency below threshold (usually a bad catalytic converter).
P0301: Cylinder 1 misfire detected.
P0171: System too lean (bank 1)—often caused by a vacuum leak or faulty oxygen sensor.

Many scanners come with built-in code libraries or connect to apps that explain what each code means. Some even suggest possible fixes.

Clearing the Codes

After reading the codes, you may want to clear them—especially if you’ve fixed the issue (like tightening the gas cap). Most scanners have a “Clear Codes” option.

But be cautious: clearing codes doesn’t fix the problem. If the issue persists, the light will come back on.

Step 3: Research the Code and Diagnose the Problem

Once you have the code, it’s time to figure out what’s wrong. Here are the most common causes of check engine lights in Chrysler vehicles in 2026:

1. Oxygen (O2) Sensor Failure

The O2 sensor monitors the amount of oxygen in the exhaust. A faulty sensor can reduce fuel efficiency and increase emissions.

Symptoms: Poor gas mileage, rough idle, failed emissions test.

Fix: Replace the sensor. Costs $100–$300 depending on the model and labor.

2. Catalytic Converter Issues

The catalytic converter reduces harmful emissions. Over time, it can clog or fail.

Symptoms: Reduced performance, sulfur smell, illuminated check engine light (often code P0420).

Fix: Replacement is expensive ($1,000–$2,500), so confirm the diagnosis with a mechanic.

3. Mass Airflow (MAF) Sensor Problems

The MAF sensor measures how much air enters the engine. Dirt or damage can cause incorrect readings.

Symptoms: Hesitation during acceleration, stalling, poor fuel economy.

Fix: Clean with MAF sensor cleaner or replace if damaged ($150–$400).

4. Spark Plug or Ignition Coil Failure

Worn spark plugs or faulty coils can cause engine misfires.

Symptoms: Rough idle, lack of power, shaking.

Fix: Replace spark plugs every 30,000–100,000 miles. Coils cost $50–$150 each.

5. Evaporative Emissions (EVAP) System Leak

This system prevents fuel vapors from escaping. A leak—often from a cracked hose or loose cap—triggers the light.

Symptoms: Gas smell, difficulty starting.

Fix: Inspect hoses and connections. Replace damaged parts ($50–$200).

6. Thermostat or Coolant Temperature Sensor Issues

If the engine doesn’t reach proper temperature, it can affect performance and emissions.

Symptoms: Overheating, poor heater performance.

Fix: Replace thermostat or sensor ($100–$300).

Step 4: Attempt Basic Repairs (If Safe and Feasible)

Some check engine light issues can be fixed at home with basic tools. Here’s how:

Tighten or Replace the Gas Cap

As mentioned earlier, this is the #1 DIY fix. If the cap is cracked or the seal is worn, replace it. OEM caps are best for Chrysler vehicles.

Replace Spark Plugs

If you’re comfortable with basic engine work:

Locate the spark plugs (usually under the ignition coils).
Disconnect the coil and remove the old plug with a socket wrench.
Install the new plug and reconnect the coil.
Repeat for all cylinders.

Use a torque wrench to avoid over-tightening.

Clean the MAF Sensor

Locate the MAF sensor (between the air filter and throttle body).
Unplug the electrical connector.
Remove the sensor and spray with MAF cleaner (do not touch the wires).
Let it dry completely before reinstalling.

Check and Replace Air Filter

A dirty air filter can restrict airflow and trigger the light.

Open the air filter housing.
Remove the old filter and inspect it.
Replace with a new one if dirty.

Step 5: When to Visit a Mechanic

Not all problems can—or should—be fixed at home. Here’s when to seek professional help:

The check engine light is flashing.
You’re getting multiple or complex codes (e.g., P0300 random misfire).
The car is running poorly, overheating, or making unusual noises.
You’ve tried basic fixes and the light remains on.
You’re not comfortable working on the engine.

In 2026, many Chrysler dealerships and independent shops use advanced diagnostic tools that can pinpoint issues faster. Some even offer remote diagnostics through the Uconnect system.

What to Expect at the Shop

The mechanic will scan the codes and perform a visual inspection.
They may run additional tests (e.g., smoke test for EVAP leaks).
You’ll receive a detailed report with recommended repairs.

Always ask for a written estimate before authorizing work.

Troubleshooting Tips for Chrysler Owners

Here are some model-specific tips for 2026 Chrysler vehicles:

Pacifica Hybrid

The hybrid system can trigger unique codes. Use a scanner that supports hybrid diagnostics.
Check the 12V battery—low voltage can cause false warnings.

Chrysler 300

Common issues include faulty ignition coils and oxygen sensors.
The 300’s V8 engine may require more frequent spark plug changes.

Voyager

Watch for EVAP system leaks—common in minivans due to frequent fueling.
Regularly inspect under-hood hoses for cracks.

Preventing Future Check Engine Light Issues

The best way to avoid engine light problems is through regular maintenance:

Follow the maintenance schedule: Check your owner’s manual for oil changes, filter replacements, and inspections.
Use quality fuel: Top-tier gasoline with detergents helps keep the engine clean.
Don’t ignore small issues: A rough idle or reduced mileage can be early warning signs.
Keep the gas cap tight: Make it a habit to check after every fill-up.
Use the Uconnect app: In 2026, many Chrysler models offer remote diagnostics and maintenance reminders.

Conclusion

Checking the engine light on your Chrysler doesn’t have to be stressful. With the right tools and knowledge, you can diagnose many issues yourself—saving time and money. Start by staying calm, checking the gas cap, and using an OBD2 scanner to read the codes. From there, research the problem, attempt safe repairs, and know when to call a professional.

Remember, the check engine light is your car’s way of communicating. Listening to it early can prevent bigger problems down the road. Whether you drive a 2026 Pacifica, 300, or Voyager, regular maintenance and smart diagnostics will keep your Chrysler running smoothly for years to come.

Don’t let that little orange light intimidate you. You’ve got this.