Anyone who can help. I have an 04 2.2 throwing code P0455 Evaporative Emissions Leak. I did a search but didn't find anything too helpful. I had the code read and erased and it came back after about 200 miles. Gas cap was/is tight. Anyone else have this problem and figure out what it was?
could be like the p0440 code, its a wire that goes to the evap canister by the gas tank that corrodes and breaks
Thanks, I'll check on that. Probably too cold today to crawl under (about 16° here today) but maybe next weekend.
Nope same thing on my 04 as well.
I sprayed silicone on the gas cap part on the car, that seal, that put the gas cap on it, then removed the car again. The gas cap was full of dry spots, junk, wasnt sealing.
Part is $18.64 at GM
- 2004 Cavalier - 124k, owned since new
I can get a new gas cap at Checker for $12.99. Seems worth a try.
Yea I am getting p0440 code, It indicating Ive got Evaporative Emissions Malfunction, I delete the code it comes back as well 200 km's, The weather has been crap for me to look at it. Ive replaced the gas cap no luck. Ive just got to trouble shoot all the emission area's. Hopefully the new gas cap corrects youre issue Tim.
Good Luck.
I had a code about an evap leak last year, vent solenoid near the canister was stuck open!!! I have an 05 sunfire!!! I was still at school at the time, so I took the Tech2 and tried to trigger it, no click.... the dealership changed it!!!
Replaced ga cap and light went out instantly. $9.89 at O'Reilly.
great, cheap and easy repair.
Also the evap test only runs between 3/4 of a tank to 1/4 of a tank anything more than 3/4 or less than a 1/4 the test doesn't run so that would be why you wouldn't see it for a while and then come back.
Interesting. Well, I was at half a tank when I put the new cap on. The light was on, I stopped at O'Reilly, put the new gas cap on, started it up and no light. Cheap fix is right.
Just in case someone searches for p0455: It's an evaporative emission leak, large leak. It could be any # of things.
Leftoverture wrote:Interesting. Well, I was at half a tank when I put the new cap on. The light was on, I stopped at O'Reilly, put the new gas cap on, started it up and no light. Cheap fix is right.
I'm calling BS on this.
For one it has to go through what is called a drive cycle. It does tons of self test while the car is on, some in open loop some clsoed, some it doesnt matter.
It does the EVAP test after the car has been started for at least 60 seconds, than purges the system and checks for leaks.
Secondly if it sees the problem has been corrected it can up to 40 drive cycles of no-faults being found before it clears the code itself.
Again BS on your story
'
- 2004 Cavalier - 124k, owned since new
Rob S wrote:Leftoverture wrote:Interesting. Well, I was at half a tank when I put the new cap on. The light was on, I stopped at O'Reilly, put the new gas cap on, started it up and no light. Cheap fix is right.
I'm calling BS on this.
For one it has to go through what is called a drive cycle. It does tons of self test while the car is on, some in open loop some clsoed, some it doesnt matter.
It does the EVAP test after the car has been started for at least 60 seconds, than purges the system and checks for leaks.
Secondly if it sees the problem has been corrected it can up to 40 drive cycles of no-faults being found before it clears the code itself.
Again BS on your story
'
I don't care what you think. That is what happened. Nothing worse than some guy who thinks he knows something coming on an internet forum and calling someone else a liar. Besides, there's a difference between a code being cleared and the light being off. I'm sure the code is still stored.
I tried to gas cap and I still have the problem. What is the next area I should check?
I REJECT YOUR REALLITY AND SUBSTITUTE MY OWN (ADAM SAVAGE, MYTHBUSTERS)
I bought my cavalier without a gas cap. Bought one at advance and the light instantly went out when I started the car.
i wrote: 0440 relates directly to the evaporative emissions system. the parts that it monitors include (from stern to stem): the gas cap, the gas fill neck, the gas tank, the gas tank pressure sensor, the vacuum lines running from the tank to the evap canister, the canister itself, the valve on the canister, the lines from the canister to the purge valve, the purge valve itself, and finally, the line from the purge valve to the intake manifold. 
if any one of these 16 parts is faulty, it could trigger the 0440. the most common place to begin diagnosis is with the gas cap, as if not screwed on tight enough (by yourself or the gas station attendant) -or- if the rubber on the cap has degraded enough to not make a seal, then this code could be thrown. a gas cap should not cost more than $6-$8 at your local parts tore. next, a visual inspection of the lines to see if any are cracked, broken, kinked, or otherwise pinched off/leaking. if, after these inspections have been made and determined to not be the cause of the problem, i wold recommend getting your emissions system smoke tested.the parts after these simple diagnoses can get quite expensive depending on where you get them from, and as such, you'll only want to change the part thats causing the issue.
p0455 has the same causes, different locations of parts. the evap canister on 00+ cars is in the back, above the gas tank.
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1) Leftoverture - I believe that the code will stay on until either a mechanic clears it, or the system stops finding the fault. When you replaced the gas cap, did you do anything else to the car? i.e., unhook the battery? The ecu will reset when the battery is unhooked for a certain period of time (I believe anywhere between 150 and 30 mins) This causes the code to be cleared.
I think that your code light didn't come back on when you restarted your car because:
You unhooked the battery,
changed the gas cap,
rehooked the battery after the ECU had enough time to reset,
The system did the EVAP test on itself, and found no leak.
Hence, why when you turned the car on, the light was off initially and stayed off. I fully agree with RobS on this. You must have disconnected your battery, and failed to mention it.
2) Harvey & xr7.....I purchased a GM gascap as well. I brought the car back to the shop, and they installed the new gas cap, and CLEARED the code/reset it for me. A couple HUNDRED kilometres later, the Check Engine Light went on again.
This thread is useful, because it think it's a problem that seems to be common, mostly to 3rd Gen Cavaliers.
If the gas cap fix doesn't do it:
1. check the hoses,
2. check the wiring.
Spending money to pay a mechanic to do another smoke test (around $60), and check the hoses and wiring for you, I found, wasn't worth it. Sometimes they can't tell where the leak is, and they need extensive troubleshooting to fix the problem.
E-roc
whoops! don't know how to edit.
meant to say "15 - 30 mins" in the 1st paragraph there.
necromanced this one... ]:->
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