Question about 1998 Pontiac Sunfire

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2004 cavalier p0455 - 1998 Pontiac Sunfire

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I had the same code for my 2004 chevy cavalier and it turned out to be the evap solenoid behind the passenger side rear tire. It has a small wiring harness coming out of it and a rubber hose connected to it. It just pops out of the frame of the car after unplugging said wire and hose. But you can only get another one by finding a junkyard that has one or going to a dealership.

Posted on Mar 31, 2009

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It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
1) Check to make sure your fuel cap is tight.
2) Visually inspect all hoses and lines from the engine to the fuel tank including the fill neck hoses.
Replace any that are worn out or broken.
Once you have fixed the problem the service engine light will go out after 3 cold starts that do not leak vapor.
Good luck and let me know what you find or don't find and we can go from there.
Regards,

Posted on Feb 17, 2009

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Just bougt a 04 cavalier. check engine is coming on. the code is po455 how do i know if my gas cap is the right one or defective?

Posted on Jun 29, 2009

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I had the same problem as t_scott_bac. The EVAP solenoid was stuck open. Replaced it and reset the engine light with a generic OBD II code reader, problem solved.

Posted on Dec 06, 2009

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SOURCE: Received P0455 Evap System Large Leak Detected - 2004 Cavalier

your problem is probably a vacuum hose that goes from the purge valve to the gas tank (crack or broken hose). There should be two of these check both. A broken vacuum line will make the purge valve make a clicking noise that can be mistaken for noisy engine valves.

Posted on Apr 28, 2010

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Code p0455 on envoy 2004


large evap leak --check gas cap that it is on --look under truck at rear of fuel tank by spare tire and check the evap canister and hoses the following link will assist you
https://www.obd-codes.com/p0455 How to Fix Check Engine Light P0455 Emissions Purge Valve Replacement How to Fix Check Engine Light P0455 Emissions Purge Valve Replacement

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Code P0455


p0 (USA fed. codes)
455
Evaporative System Malfunction, Gross Leak #1 DTC of all time.......
gas cap missing ,or loose or wrong cap
or any leak in the tank vent system.
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Code 0455 on a 2004 grand prix


P0455 - Evaporative Emission Control (fuel vapor control) System Leak Detected Gross Leak

Possible causes- Missing or loose fuel cap
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- Foreign matter caught in fuel filler cap
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1 Answer

'04 chevy cavalier w/check engine light on, comes up w/ \code P0455. what is my problem?


This means you have a evap leak.
Part of the emmion laws state that fuel vapors can not excape in to the air
This can be caused by
1. your gas cap not on or was not on properly
2. you have a leak in the Evap system.

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1 Answer

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It is your Evaporative Cannister, you probably have a disconnected or bad hose.

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That code if for a leak in the evaporative emissions system. Check you fuel filler cap first. If it isn't on right it will cause this fault code. If that's not it, you'll need a mechanic to test the entire system for leaks.

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Received P0455 Evap System Large Leak Detected - 2004 Cavalier


your problem is probably a vacuum hose that goes from the purge valve to the gas tank (crack or broken hose). There should be two of these check both. A broken vacuum line will make the purge valve make a clicking noise that can be mistaken for noisy engine valves.

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have the gas cap tested or just replace it, then disconnect the battery for 5 minutes to reset the code, then drive it for a few miles and see if problem comes back, if it does a trip to the dealer is in order, as this may be covered by your emission warranty which is good for 70,000 miles.

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The system detected a leak in the evaporative emission system, code P0455 the car is a 2004 Audi A4 Quattro conv 6cyl, 3l.


Replace the gas cap and clear the fault code, most times this clears the issue with code P0455. If it does'nt then you will have to have test equipment hooked up by the dealer to find the leak.

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