Play Now. Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. Tech Notes What does this mean? The auto repair labor rates vary widely across the country, and even within the same city. How much do you know about cars? Take the AutoCodes.
When is the code detected? If pressure does not increase, the Engine Control Module ECM will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
Get Access to Factory Service Manuals. Need more help? Get the P Chevrolet code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON? Repair Importance Level: 1.One of the most common trouble codes with the Chevy Silverado is the P code. P Indicates that there is a large leak in the evaporative emission control system. It often appears with, or is related other codes, such as PP, and very often P P is normally not an immediate threat to the drive-ability of your Silverado.
It is often accompanied by P This means that regardless of which make or model of vehicle, the code will mean the same thing Silverado or not. The code technically stands for:. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. P code will typically not be accompanied by any noticeable symptoms other than the smell of gas and the service engine soon light.
You may notice the slightest dip in fuel economy as well. The EVAP system deals directly with fuel vapors. There are many things that can cause the P trouble code to trigger in your Chevy Silverado. Here are the most common problems that will throw the code:. A mechanic has a wide range of instruments at his disposal to diagnose what would be causing the P in your Chevy Silverado.
Here are the most common things that are done to diagnose the code:.
Of all the items listed above, it would be wise to start with the gas cap and work your way to the fuel tank, since the gas cap is far and away the easiest and least expensive items to replace on here. Good luck figuring out what is causing your Chevy Silverado to throw the P code. We hope this helps. If there is anything that you feel like you could add, please feel free to leave a comment below. You could have a fuel leak. Pay extra attention to your tank level and make sure you are not leaking fuel.
The code technically stands for: System Gross Leak Evaporative Emission System The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. Chevy Silverado P OBDII Code Symptoms The service engine soon light is often the only sign that the P code has been triggered P code will typically not be accompanied by any noticeable symptoms other than the smell of gas and the service engine soon light.
You should particularly notice the smell of fuel around the fuel tank area or fuel filler tube. This will cause the P code. Look for either a tear or hole in it. This is one of the most common issues that causes the code Vapor Canister Purge Valve — One of the most common causes of the P code is the vapor canister purge valve. There are a few clips that you need to find and remove. Faulty Charcoal Canister — The charcoal canister is often the cause of P Fuel Tank Sending Unit — It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad.
This can reduce tank pressure and throw the code.
P0455 Chevy Silverado
Fuel Cap — A bad fuel cap can cause the code to be thrown for sure.This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. P is the general code for a problem with the Fuel Evaporative Emission System. The P code specifically indicates a large leak in the system, not a fuel leak, but one in the vapor recovery system.
The leak can be caused from a variety of components. The most common is related to the fuel filler cap which could be missing, not correctly installed, not sealing properly or may be damaged to the top of the filler neck. The next most frequent problem is a leak in a hose. Hoses on the breather system tend to crack with age including the large connecting hose on the filler neck to the tank.
The Evaporative Emission System has a purge valve to regulate pressure in the system and this will need to be checked by a technician. Vehicles with a charcoal filter on their evaporative system need to check the filter for cracks, damage, or leaks.
The fuel tank itself may be leaking or the gasket where the fuel level sensor, pressure sensor, and fuel pick attach to the tank may be leaking. See the manufacturer's diagram of the system to verify components and their locations.
Note that even if the code indicates a large leak, it may actually be fairly small. There can be a noticeable gasoline fuel smell in the filler area or tank area. It is also possible the smell could also becoming from the evaporative lines to the engine intake system. The technician should then reset the OBD-II fault codes and road test the vehicle to see if the code comes back and he can observe this by watching it live on his scanner while driving.
If the code comes back, then the mechanic will need to do a visual inspection to determine any obvious leaks. If no leaks are seen, then the next step is to use a smoke test on the system to look for a leak. If there is no leak noted, then there may be a sensor issue that will need to be tested by the manufacturer's instructions as each system is slightly different. Diagnostic errors are largely due to not following the procedure.
The process is a logical and economically sound way to proceed. P code will not affect the way the car drives, but if the fuel odors are very strong or have obvious fuel leaks, take the car to a qualified technician as soon as possible.
The system leak failure can cause excessive fuel consumption in certain circumstances so it is best to take to a technician at your first opportunity. Occasionally, if no problems are found, the technician can reset the fault codes, then retest.
Replacing the gas cap if it doesn't tighten or seal. Replacing the fuel filler neck if it's damaged or has anything that would prevent it from sealing with the cap.The EVAP system prevents fuel vapors from escaping into the atmosphere. The system allows for fuel vapors from the gas tank to be absorbed by charcoal pellets located in the charcoal canister also known as EVAP Canisterand to be released to the engine air intake manifold at a later time.
The system is controlled by the engine control module ECM via a vent control and purge control valve. Prior to the mandatory installation of engine EVAP systems inthese harmful fuel vapors were released into the atmosphere. The test occurs while your vehicle is being driven and also when your vehicle is parked engine off. During the vapor leak test, the ECM commands the vent and purge control valves to close.
If the ECM detects a leak, it records a trouble code. Here are possible engine faults which may cause a P trouble code to be recorded by the ECM Listed in the order of expense to repair :. A P trouble code will generally trigger the check engine light on.
Freeze frame data may be helpful to a technician when diagnosing the root cause of a P trouble code when the fault is not easy to find. First thing first Make sure when closing the cap you hear the right number of clicks.
P0455 – Meaning, Causes, Symptoms, & Fixes
Replace the cap with a new one or tighten the cap, depending on the problem you found, then drive your vehicle for the next few days as normal. The check engine light should turn off on its own and the trouble code erase from memory after a few drive cycles. A drive cycle is typically considered one full engine on and engine off cycle where the vehicle is driven for at least 30 miles and then parked for at least 8 hours.
If you have access to a OBD-II scan tool, you can manually turn off the check engine light erase the P trouble code and see if the check engine light will turn back on over the course of a week or so of driving. Should you find that the gas cap was tight and the seal appear to be in good condition, further diagnosis will be required.
You will then need to inspect all EVAP hoses leading from the gas tank to the charcoal canister, and from the charcoal canister to the engine air intake usually the air cleaner assembly. Finding the EVAP hoses may or may not be difficult. If you can locate the EVAP canister usually near the gas tankyou can follow the hoses leading to the engine compartment and gas tank.
If the EVAP hoses too appear to be in good condition, not loose and not disconnected, the next step will require the use of proper diagnostic tools, and best left to a technician to handle. The smoke machine places smoke in the EVAP system.
Leaks can then be visually detected. Diagnosis may also require electrical testing of the purge valve and the vent control valve for proper operation. You may drive your vehicle while trouble code P is present unless the gas vapor odors are very strong or you see obvious fuel liquid leaks.
Extreme danger, seek repairs if either of these two scenarios exist. Note, a large fuel vapor leak may cause fuel economy issues. It is best not to ignore the problem, rather investigate the issue s as soon as possible. What caused my vehicle to trigger a P trouble code? No smog check? No problem. Pay your DMV renewal fees now and avoid penalties! NeedTags - OL California authorized online vehicle registration service provider.
All Rights Reserved.The evaporative emission control EVAP system prevents fuel vapors from escaping into the atmosphere.
The fuel vapors from the fuel tank are absorbed and stored by charcoal pellets in the charcoal canister. The vent control valve is controlled by the engine control module ECM and allows air to flow into the charcoal canister to purge the gas vapors into the engine air intake to be burned.
The flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge valve. The vent control valve is normally opened when the engine is on, and the purge volume control valve is normally closed and is controlled by the ECM to open when it is ready to purge the stored fuel vapors from the charcoal canister.
However, the ECM occasionally performs leak tests to ensure the evaporative emission control system is working properly when the vehicle is turned off.
In the case of P, it is a very large leak. This is usually indicative of a loose, broken, or missing gas cap. The driver will likely not notice any symptoms associated with P other than the check engine light being on. If the fuel odor is very strong and it is apparent that there are leaks, take your vehicle to your repair shop as soon as possible. Download The Savvy Motorist Report now to discover:.
Many people fail to perform a smoke test before or after replacing the fuel cap and jump straight to component replacement. The problem could be as simple as a loose or cracked EVAP hose. More diagnostic steps could require electrical testing of the purge and vent control valves for proper operation. For error code P, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair.
Where is the vent Ctrl. The location of the control valve, purge valve, charcoal canister, and engine air box will be dependent on your vehicle.
Fluid levels have nothibg to dp witg the evap leak. If it aint the gas cap check the fuel filler neck. Often a mechanic will vurn baby oil and spray that into the fuel lines and evap limes for around one hundred dollars.
P0455 CHEVROLET - Evaporative Emission Control System Leak Detected Gross Leak
Fuel filler neck from gas cap to gas tank usually has an evap line as the evap system includes those holes on the side of where the gas station nozzle goes. Those holes go to a single tube that captures the evaporated gas and there is usually a third tube on the fuel filler neck assembly to let air into the system through a filter. The fuel filler is the part that goes from the gas cap to the tank. I patched a hole in my fuel filler neck with an epoxy stick from Home Depot in the plumbing aisle for about 4 dollars after i sanded the fuel filler with a wire brush wheel on a drill.
This code came up and I have noticed loss in fuel economy. Should I still purchase new gas cap to start?Play Now. How is the P GMC code repair? Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. Tech Notes What does this mean? The auto repair labor rates vary widely across the country, and even within the same city.
How much do you know about cars? Take the AutoCodes. When is the code detected? If pressure does not increase, the Engine Control Module ECM will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve.
After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed. Get Access to Factory Service Manuals. Need more help? Get the P Gmc code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON?
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