2013 GMC Terrain Smells Like Gas

Identifying Potential Causes of Gas Smells in Your 2013 GMC Terrain and Essential Safety Measures

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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 2013 GMC Terrain 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 2013 GMC Terrain 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 2013 GMC Terrain?

When you detect a gas smell in your 2013 GMC Terrain, it's essential to approach the problem methodically to identify the root cause. Start by inspecting the vehicle for visible fuel leaks, as this is one of the most straightforward issues to check. Next, examine the fuel injectors, as a faulty injector can lead to fuel escaping into the engine compartment. Utilizing a diagnostic scanner can also be beneficial; it allows you to check for any error codes that may indicate a malfunction in the fuel system. Additionally, pay attention to the evaporative emissions system, which can develop leaks or other issues that contribute to gas odors. Don't overlook the exhaust system, as leaks here can also produce a gas smell inside the cabin. Lastly, ensure that the gas cap is properly sealed and in good condition, as a loose or damaged cap can release gas vapors. By following this structured diagnostic approach, you can effectively narrow down the cause of the gas smell and take the necessary steps to resolve it.

What could be causing my 2013 GMC Terrain to smell like gas?

If your 2013 GMC Terrain is emitting a gas smell, it’s crucial to identify the underlying cause to ensure both safety and vehicle performance. One of the most common culprits is a fuel leak, which can occur anywhere in the fuel system, from the tank to the injectors. Inspecting the fuel lines and connections for any signs of leakage is a good starting point. Another potential issue could be a faulty fuel injector, which may not seal properly, allowing fuel to escape and create a noticeable odor. Additionally, problems with the evaporative emissions system, such as a leak in the charcoal canister or associated hoses, can lead to gas vapors entering the cabin. Don’t overlook the gas cap; a loose or damaged cap can easily allow fuel vapors to escape, resulting in a gas smell. Lastly, consider the exhaust system; a leak or damage to components like the catalytic converter can also cause exhaust fumes to mix with cabin air. Addressing these issues promptly is essential, and while some checks can be done at home, consulting a qualified mechanic for a thorough inspection is advisable to ensure safety and proper resolution.

How urgent is it to address the gas smell in my 2013 GMC Terrain?

Addressing a gas smell in your 2013 GMC Terrain is not just a matter of convenience; it is a critical safety issue that requires immediate attention. Gas leaks pose significant risks, including the potential for fire or explosion, particularly in the confined space of a vehicle. Moreover, the health implications of inhaling gas fumes can be severe, leading to symptoms such as dizziness and nausea, which can impair your ability to drive safely. Ignoring this warning sign can also result in further damage to your vehicle's fuel system, leading to costly repairs down the line. Therefore, if you detect a gas smell, it is essential to act quickly. Start by inspecting the fuel lines and connections for any visible leaks, and consider consulting a professional if you are unsure. Taking these steps not only protects your health and safety but also helps maintain the integrity of your vehicle.

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