Jeep Compass Check Engine Light
When your Jeep Compass’s dashboard suddenly lights up, panic and worry will inevitably have you asking, “What’s wrong?”
In our comprehensive guide, we’ll help you understand your Jeep’s check engine light, why it may be lighting up your dashboard, and when to look for a Jeep service center near you.
What Does Your Check Engine Light Mean?
Your Jeep’s check engine light is one of the most alarming signals on your vehicle’s dashboard, since it typically means that the heart of your Jeep may be nearing red-alert levels–a stressor for any vehicle owner.
Vehicles have their own form of communication, known as the onboard diagnostics system. This system comprises all the various lights and symbols on your Jeep’s dashboard, and each one indicates irregularities or issues within your car.
The check engine light, or CEL, is often depicted as an engine block icon or as specific words like “check engine.” A steadily illuminated check engine light on the Jeep Compass points towards a serious–though not urgent–issue. When the check engine light starts to flash, however, an immediate repair or diagnosis is needed.
Common Reasons Why the Check Engine Light Comes On
Here are some of the most common reasons your Jeep Compass’s check engine light has turned on:
- Loose or Damaged Gas Cap: One of the most common causes of a check engine light is a cracked or improperly sealed gas cap, which can allow fuel vapors to escape and trigger the light.
Solution: Ensure the gas cap is tightened correctly or replace it if it’s damaged. The light should turn off after a few cycles of driving.
- Faulty Oxygen Sensor (O2 Sensor): The oxygen sensor monitors the amount of unburned oxygen in your Jeep’s exhaust and helps regulate the fuel-air mixture. A faulty sensor can decrease fuel efficiency and increase emissions. Solution: Sensor replacement, which is usually less expensive than other repairs.
- Catalytic Converter Issues: The catalytic converter helps reduce harmful emissions. If it's malfunctioning, your Jeep will produce higher emissions and may fail a smog test. Signs include a noticeable drop in fuel economy and a sulfur-like smell from the exhaust.
Solution: Replace the catalytic converter.
- Mass Airflow Sensor (MAF) Failure: The MAF sensor measures the amount of air entering the engine to determine the proper fuel mixture. A malfunctioning MAF sensor can lead to poor fuel economy, stalling, and engine hesitation. Solution: Clean or replace the MAF sensor.
- Worn Spark Plugs or Ignition Coils: Spark plugs and ignition coils, which are essential for engine combustion, can wear out over time. When they do, this leads to engine misfires and rough idling. If left unaddressed, it can damage the catalytic converter.
Solution: Replacing spark plugs and ignition coils at recommended service intervals is crucial for smooth engine performance.
- Vacuum System Leaks: The vacuum system supports various engine functions, and a leak can cause issues such as high idle speed or misfires. Symptoms of a vacuum leak include a hissing sound from under the hood or stalling. Solution: Leaks often occur in hoses and seals, which can be repaired or replaced.
- Battery and Charging System Problems: While not a direct engine issue, a failing battery or charging system can cause the check engine light. Signs include difficulty starting your Jeep or electrical components not working correctly. Solution: Check battery connections and the charging system. Replacement may be necessary.
Breaking Down the Jeep Compass Check Engine Light Codes
The first step to addressing the “check engine” light on your Jeep Compass is to run a diagnostic test using an OBD-II scanner. An OBD-II (On-Board Diagnostics) scanner is used to retrieve diagnostic trouble codes (DTCs) that help you understand the issue that’s happening within your vehicle’s engine.
Here are some of the most common OBD 2 codes for your Jeep Compass, and what they mean:
|
Code |
Name |
Description |
|
P0300 |
Random/ Multiple Cylinder Misfire Detected |
Indicates an engine misfire in one or more cylinders |
|
P0420 |
Catalyst System Efficiency Below Threshold |
Issue with the catalytic converter |
|
P0171 |
System Too Lean Bank 1 |
Potential failure of the oxygen sensor, or an issue with the air-fuel mixture |
|
P0455 |
Evaporative Emission Control System Large Leak Detected |
The fuel cap is possibly loose, or there is a larger issue with the Jeep’s emissions system |
|
C1210 |
ABS Pump Motor Overrun |
Issue with the anti-lock braking system |
|
P0440 |
Evaporative Emission Control System Malfunction |
Indicates an issue with the system that captures fuel vapors to prevent them from being released into the atmosphere. |
|
P0456 |
Evaporative Emission System Leak Detected (Small Leak) |
Could be a minor fuel-system leak, often related to the gas cap. |
These scanners are available at most dealership parts centers, and some dealers offer free diagnostic scanning. Once the codes are retrieved from your Jeep’s OBD-II port, you can look up their meaning or consult a certified Jeep mechanic at Santee CDJR for further advice.
How to Complete a Jeep Compass Check Engine Light Reset
If you’ve diagnosed and fixed the underlying issue, the final step will be to reset the light.
Here are several ways to reset it:
- Use an OBD-II Scanner: The easiest way to clear the error codes is to use an OBD-II scanner. Plug the scanner into the diagnostic port, usually located under the dashboard, and follow the instructions to clear the codes.
- Disconnect the Battery: If you don't have a code reader, disconnect the negative battery cable for about 15 minutes. This will reset the engine control module and turn off the check engine light. Remember to reconnect the cable securely.
- Drive and Wait: Sometimes the light will reset itself after several drive cycles if the problem has been resolved. This method just requires patience and time.
If you don’t feel comfortable resetting the check engine on the Jeep Compass, stop by Santee Chrysler Dodge Jeep RAM for help!
Please note that resetting the Jeep Compass check engine light is not recommended for beginners or those without some automotive knowledge. Feel free to stop by Santee CDJR and let our technicians handle it for you!
Discover Reliable Service for Your Jeep Compass at Santee CDJR
Our factory-trained Jeep technicians specialize in diagnosing and repairing Jeep models, from the Grand Cherokee to the Compass. With access to cutting-edge diagnostic equipment and genuine OEM parts, our team can quickly identify the issue, make the necessary repairs, and help you get back on the road safely.
With regular maintenance services, including oil changes and spark plug replacements, we can help ensure that your Jeep is well-prepared for the road ahead. Schedule a Jeep Compass service appointment online today, or visit us in Manning, SC!