2024 Chevrolet Trailblazer Smells Like Gas

Common Causes of Gas Smells in Your 2024 Chevrolet Trailblazer and Essential Safety Precautions

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Reviewed by
Devin Cabugcal
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 2024 Chevrolet Trailblazer 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 2024 Chevrolet Trailblazer 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 steps should I take to diagnose the gas smell in my 2024 Chevrolet Trailblazer?

To effectively diagnose the gas smell in your 2024 Chevrolet Trailblazer, start by checking for visible leaks beneath the vehicle, as this can often reveal immediate issues with the fuel system. Next, inspect the fuel cap to ensure it is tightly secured, as a loose or damaged cap can lead to gas odors escaping. Following this, examine the fuel lines and connections for any signs of wear or damage, which could indicate a leak. If these initial checks do not resolve the issue, consider the fuel injector, as a malfunction here can also contribute to gas smells; if necessary, consult a professional for a thorough inspection. Additionally, inspect the fuel tank for any signs of damage or leaks, and do not overlook the exhaust system, as problems here can sometimes lead to gas odors inside the cabin. If you are still unable to pinpoint the source of the smell after these checks, it is advisable to visit a qualified mechanic for a comprehensive diagnosis. By following this structured approach, you can systematically identify and address the source of the gas smell in your vehicle.

What could be causing my 2024 Chevrolet Trailblazer to smell like gas?

If your 2024 Chevrolet Trailblazer is emitting a gas smell, it’s essential to understand the common problems that could be causing this issue. A fuel leak is often the primary suspect, which can arise from a faulty fuel injector, a damaged fuel line, or a compromised fuel tank. Such leaks not only create a significant safety hazard but can also lead to reduced fuel efficiency. Another frequent cause is a faulty fuel cap; if it’s loose, damaged, or missing, it can allow fuel vapors to escape, resulting in a noticeable odor. Additionally, issues with the evaporative emissions system, which captures and recirculates fuel vapors, may lead to gas smells, often due to a malfunctioning charcoal canister. An exhaust system leak, such as a crack in the exhaust manifold or a damaged catalytic converter, can also produce a gas-like odor inside the vehicle. Lastly, an engine misfire can cause unburned fuel to enter the exhaust system, contributing to the smell. Given the potential dangers associated with these issues, it’s crucial to have your vehicle inspected by a qualified mechanic to ensure safety and proper functioning.

How urgent is it to address the gas smell in my 2024 Chevrolet Trailblazer?

Addressing a gas smell in your 2024 Chevrolet Trailblazer is not just a matter of convenience; it is an urgent safety concern that should never be overlooked. Gas leaks pose a significant risk of fire or explosion, particularly in the confined space of a vehicle, making immediate action essential. Additionally, inhaling gas fumes can lead to serious health issues, including dizziness and nausea, which can impair your ability to drive safely. Beyond the immediate dangers, neglecting a gas smell can result in further damage to your vehicle's components, leading to costly repairs down the line. Therefore, if you notice a gas odor, it is crucial to seek professional assistance without delay to ensure both your safety and the longevity of your vehicle.

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2024 Chevrolet Trailblazer: Why It Smells Like Gas & Fixes