2021 Buick Encore Smells Like Gas

Identifying the Causes of Gas Smells in Your 2021 Buick Encore and Essential Safety Measures to Take

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
15% chance it's the
Gas Cap
0%
40% chance it's the
Emissions Control System
0%
45% chance it's
Something else
The most common reasons a 2021 Buick Encore smells like gas are the gas cap, the fuel system, or the emissions control system.
  • Gas Cap: A loose or damaged gas cap can cause fuel vapors to escape, triggering the check engine light and potentially affecting fuel system pressure.
  • Emissions Control System: A faulty emissions control system can lead to increased hydrocarbon emissions and trigger the check engine light due to malfunctioning components like the EGR valve or O2 sensors.
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 2021 Buick Encore smells like gas?

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 failing catalytic converter can cause a vehicle to fail emissions tests and turn on the check engine light. The exhaust might have an unusual smell. A restricted catalytic converter can result in a loss of engine power.

» LEARN MORE: How to tell if your catalytic converter is failing

The check engine light will illuminate any time there is a failed EVAP system test. This will be indicated by the various on-board diagnostics trouble codes that are stored in the vehicle's memory. Also, in some models, there may be a popping sound accompanying the check engine light, as the leak detection pump continuously attempts to pressurize the fuel tank. The canister may also cause difficulty starting the engine, a rough idle, and poor fuel mileage.

The check engine light will illuminate any time there is a failed EVAP system test. This will be indicated by the various on-board diagnostics trouble codes that are stored in the vehicle's memory. Also, in some models, there may be a popping sound accompanying the check engine light, as the leak detection pump continuously attempts to pressurize the fuel tank. A fuel tank leak may also cause difficulty starting the engine, a rough idle, and poor fuel mileage. When a fuel tank is simply corroded to the point of failure, the exterior tank condition rarely shows damage. The inside of the fuel tank will be rusted or corroded, and rust flakes or other debris may be floating in the fuel.

For most vehicles, the only symptom will be a check engine light or fuel tank filler cap light illuminating on the driver instrument cluster. This is to signal that there is an evaporative emissions (EVAP) leak. In some situations, the vehicle may take longer than normal to start, or, more rarely, the engine may not start at all. on-board diagnostic (OBD) trouble codes will refer to EVAP system failures such as a small or massive EVAP system leak. Lastly, the powertrain control module may notice a lean running condition, which could even lead to random and infrequent misfires.

What are the potential causes and diagnostic steps for a gas smell in a 2021 Buick Encore?

When you detect a gas smell in your 2021 Buick Encore, it's essential to approach the situation methodically to identify the source of the odor. Start by visually inspecting the area around your vehicle for any signs of fuel leaks, such as puddles or drips, which could indicate a problem with the fuel system. Next, check the fuel cap to ensure it is securely tightened and free from damage, as a faulty cap can allow gas vapors to escape. If these initial checks do not reveal the issue, consider using a diagnostic scanner to look for error codes that may point to problems within the fuel or emissions systems. Additionally, examining the exhaust system for any leaks or damage is crucial, as these can sometimes produce a gas-like smell inside the cabin. If you are unable to pinpoint the source of the odor after these steps, it may be wise to consult a qualified mechanic for a thorough inspection. By following this diagnostic approach, you can effectively address the gas smell issue and ensure your vehicle remains safe and reliable.

What could be causing my 2021 Buick Encore to smell like gas?

If your 2021 Buick Encore is emitting a gas smell, it’s crucial to identify the underlying issues to ensure both safety and vehicle performance. One common culprit could be a fuel leak, which may stem from damaged fuel lines, leaking fuel injectors, or a compromised fuel tank seal. Additionally, a faulty fuel injector that fails to atomize fuel correctly can contribute to the odor. Another potential source is the evaporative emissions system, which manages fuel vapor release; any malfunction here can lead to noticeable gas smells inside the cabin. Don’t overlook the simple yet often overlooked issue of a loose or missing gas cap, as this can allow vapors to escape. Lastly, problems within the exhaust system, such as leaks or a damaged catalytic converter, can also produce a gas-like odor. Addressing these issues promptly with a qualified mechanic is essential for maintaining your vehicle's safety and functionality.

How urgent is it to address a gas smell in a 2021 Buick Encore?

When you detect a gas smell in your 2021 Buick Encore, it is essential to act swiftly due to the serious implications of neglecting this issue. Gas leaks not only pose a significant fire hazard, increasing the risk of combustion or explosion, but they also present health risks from inhaling toxic fumes, which can lead to symptoms such as dizziness and nausea. Furthermore, ignoring this warning sign can result in more extensive damage to your vehicle's components, leading to costly repairs down the line. Therefore, it is crucial to prioritize your safety and the integrity of your vehicle by seeking professional assistance immediately to diagnose and resolve the problem. Taking prompt action can prevent dangerous situations and ensure your Buick Encore remains in optimal condition.

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2021 Buick Encore Smells Like Gas? Causes & Repairs