Buick Encore Has A Check Engine Light

Common Causes for the Check Engine Light in Your Buick Encore and How to Resolve Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Emissions System
0%
60% chance it's
Something else
The most common reasons a Buick Encore has a check engine light are an emissions system component, a sensor, or a catalytic converter.
  • Emissions System: A faulty emissions system component, such as an oxygen sensor or EGR valve, can lead to increased emissions and trigger the check engine light.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a Buick Encore has a check engine light?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

Due to the nature of electrical systems on modern vehicles, the range of problems these can cause are nearly limitless. However, there is a way to categorize them in two ways. Permanent and intermittent problems. Permanent problems appear and remain. This may be the vehicle will not start, the radio does not work, or the door chime will not turn off among many, many others. These problems are more straight-forward to diagnose since they present themselves at all time. This means there will always be a fault to find. Intermittent electrical problems, however, can be difficult or impossible to locate, since they appear then disappear without warning. The best case scenario for an intermittent issue is when replicating the problem is easily accomplished and understood. This allows a technician to make an issue semi-permanent, allowing them to find the fault. Other issues that come and go without warning and cannot be replicated on demand must occur when the technician is servicing the vehicle, otherwise there is no problem to correct. It is most important to understand that electrical system faults always require inspection, and can include the vehicle working in any manner, or not working at all.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

Troubleshooting Check Engine Light in a Buick Encore

When faced with a Check Engine Light in your Buick Encore, a systematic diagnostic approach can save you time and money. Begin by checking the simplest potential causes, such as ensuring that your gas cap is securely tightened, as a loose cap can often trigger the light. If the cap is fine, consider using an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored in the vehicle's computer. This tool can provide valuable insights into the specific issues affecting your engine. Once you have the codes, research their meanings to determine whether they indicate minor issues, like a faulty sensor, or more serious problems that may require professional intervention. If the light is flashing, it’s a sign of a more urgent issue, and you should refrain from driving the vehicle until it has been assessed. If the light turns off intermittently without any noticeable symptoms, keep an eye on it, but don’t hesitate to seek professional help if it reappears. By following this structured approach, you can effectively diagnose and address the causes of the Check Engine Light, ensuring your Buick Encore remains in optimal condition.

What to Check When the Check Engine Light is On in a Buick Encore?

When the check engine light illuminates in your Buick Encore, it can be a source of concern, but there are several common issues you can investigate before seeking professional help. Start by checking the gas cap; a loose or damaged cap is often the culprit and can easily be tightened or replaced. Next, assess your oil level, as low oil can not only trigger the light but also lead to more severe engine problems if left unaddressed. Pay attention to the nature of the light; if it’s flashing, this indicates a more serious issue, such as a misfire, which could potentially damage your catalytic converter. In such cases, it’s crucial to act quickly and consider visiting a Buick service center for a thorough diagnosis. Regardless of the specific issue, addressing the check engine light promptly is essential for maintaining your vehicle's safety and performance, ensuring that you can continue to enjoy your Buick Encore without unexpected interruptions.

Why is the Check Engine Light On in a Buick Encore?

When the Check Engine Light illuminates in your Buick Encore, it serves as a crucial alert that should not be ignored. While some causes, like a loose gas cap, may seem trivial, they can lead to decreased fuel efficiency and increased emissions if left unaddressed. More serious issues, such as a failing catalytic converter or a defective mass airflow sensor, can significantly impact your vehicle's performance and safety. Ignoring these symptoms could result in costly repairs down the line or even compromise your safety on the road. Therefore, it is essential to diagnose the underlying issue as soon as possible. For DIY enthusiasts, checking the gas cap and inspecting engine sensors can be a good starting point. If you identify a problem, addressing it promptly not only helps maintain your vehicle's health but also ensures a safer driving experience. Once repairs are made, you can easily reset the Check Engine Light by disconnecting the battery, allowing you to monitor your vehicle's performance effectively.

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