#08 COBALT HOW TO#
#08 COBALT CODE#
#08 COBALT PLUS#

(2) They’ll use a scan tool to confirm that the EVAP vent solenoids and valves are operating correctly.

After the checks and fixes listed above, the mechanic will perform two tests: (1) A smoke test (using a smoke machine).The fuel tank pressure will be checked and monitored.The mechanic will inspect the gas cap to ensure it can handle pressure if you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.This includes the purge valve, line, and canister. After ascertaining what trouble codes appear with the P0455, the mechanic will typically inspect the EVAP system.Additional trouble codes provide clues to the problem. The mechanic will typically check to see if there are any other trouble codes.

#08 COBALT CODE#

You’re looking for the smell of fuel.Ī mechanic has a wide range of instruments to aid in diagnosing the p0455 code in your Chevy Cobalt. Smell around the gas cap, fuel filler neck, EVAP hoses, and anywhere else you can safely get your head.

#08 COBALT HOW TO#

This video is a fantastic resource on how to test your gas cap.

Check the seal on your Cobalt’s gas cap.

Inspect the EVAP system hoses for a leak.

When the fuel filler neck gasket dries out, the fuel tank can’t hold pressure anymore.īefore sending your Cobalt off for a thorough evaluation, you can do a few things. This gasket can dry out, especially with vehicles that spend their time in dry climates.

Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank.

#08 COBALT PLUS#

If you are getting that message, plus a P0455, it may save you a ton of time and money to replace the fuel cap and see if it goes away. Often, you’ll get a message informing you that the fuel cap is off even when it is on.

Fuel Cap– A bad fuel cap can cause P0455.This can reduce tank pressure and throw the code. Fuel Tank Sending Unit– It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad.The EVAP canister is filled with activated carbon, which helps reduce pollutants by trapping fuel vapors emitted from the gas tank and storing them until they can be burned off in the engine. Faulty Charcoal Canister– An EVAP (Evaporative Emission Control System) charcoal canister plays a vital role in operating a car’s emissions system.An EVAP purge valve is a component of the EVAP system that allows fuel vapors to be released from the charcoal canister and sent back into the engine for combustion. Purge Valve– One of the most common causes of the P0455 code is the vapor canister purge valve.This is one of the most common issues that causes the code. Evap System Hose– The EVAP hose carries fuel vapor from the fuel tank to the intake manifold can begin to leak.How your Cobalt’s EVAP system works will depend on the model year and engine type. Here are the most common causes of P0455. If these vapors leak from the system, you’ll often smell them faintly while operating the vehicle. The EVAP system deals directly with fuel vapors. You should particularly notice the smell of fuel around the fuel tank area or fuel filler tube. P0455 code will typically not be accompanied by any noticeable symptoms other than the smell of gas and the service engine soon light.

The “large” really refers to how much pressure is lost. While the trouble code may state that there is a “large leak” in the EVAP system of your Chevy Cobalt, the actual leak will most likely still look relatively small. For example, P0456 means your Cobalt has a small EVAP leak. P0455 indicates a large leak in the evaporative emission control system. When there is a large leak in the Chevy Cobalt’s EVAP system, it will throw the P0455 OBDII Code. The EVAP system prevents harmful gases from escaping into the atmosphere and does not affect how the engine runs, which means this code is not a breakdown risk. Your Cobalt’s EVAP system (Evaporative Emission Control System) helps reduce emissions from your car by collecting fuel vapors from the gas tank and sending them back into the engine for combustion. Evaporative Emissions System Purge valves come in many shapes and sizes Repair steps will vary depending on the model year and engine. P0455 is a generic diagnostic trouble code, meaning it has the same definition for your Chevy Cobalt as any other vehicle. P0455 Definition: System Gross Leak – Evaporative Emission System But, whenever the check engine light is on, it’s good to deal with the code as soon as possible.Ĭheck that your Cobalt’s gas cap is present and sealing well. P0455 usually is not an immediate threat to the driveability of your Cobalt. With this code, you shouldn’t notice any symptoms besides perhaps a noticeable fuel smell. P0455 in the Chevy Cobalt is a trouble code that indicates your truck has a LARGE evaporative emissions leak.

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