Help with p0449 & p0455 codes
October 12th, 2011, 10:50 AM
#91
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DITTO on your message to others!! When my light would come on I simply replaced both valves. But when that didnt work, I noticed that the hose to the canister had gotten hard and was crimped. I replaced the hose and the light has not returned since. My total was about $60
October 13th, 2011, 4:20 AM
#92
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Thomas Jachim
PS to pour salt into the wound the same code came up a week later and I had to re-attach the hose to the canister because the tech,that worked on it, didnot push the hose on the canister nipple correctly. Typical!!
October 19th, 2011, 2:37 PM
#95
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When you say pucking do you mean bucking?
Do you have a check engine light on? has it just started or been happening, bad gas could cause poor performance, a blocked cat could also cause poor performance... will need a bit more info to help whittle it down...
October 19th, 2011, 7:50 PM
#96
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it came on and we replaced the IGR or IRG, we switched gas and it's still doing it. The check engine light came on with that p0445 code, and I'm thinking about replacing the canister, hoses and evap.
October 24th, 2011, 4:57 PM
#97
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EVAP Crazy
I discovered 3 - error codes P0442, P0443 & P0455 after taking my 03' Suburban 1500 LS 5.3L 2wd to get smoged. Went to my mechanic who did a smoke test found leaks on both (cracked vent/rollover valves) from the top of the fuel tank. Fuel tank replaced, $1,100 dollars later code P0455 came back after a week or two. Back to mechanic discovered bad contact where the wires connect to the molex connector to the canister purge control solenoid while moving wires around because it would work then not work. He ordered the connector, I replaced it myself. Took it back so he could clear the code. Code back (P0455) after a week. I replaced the gas cap with an OEM. Took it to my friend who read and cleared the code. Code was back after a couple weeks. Where do I look next? Please help I'm going crazy. I really need a DIY fix cause I'm running out of cash....
October 24th, 2011, 9:03 PM
#99
Administrator
P0455 means a large leak has been detected.
Inspect every inch of the EVAP system hoses and connections, look for splits or cracks especially at joints and angles....check all of the rubber fittings for tight fit. The smoke test should have reviled just about all of them...
When under the vehicle you shouldn't be able to smell any gasoline.
A bad filler neck hose on your gas tank
a poorly installed fuel pump into the tank (smell for gas)
You can try disconnecting the various EVAP lines and try blowing into them to see if you get leaks ( this is how I found the cracked hose on my wife's mini-van)
if the tank was removed make sure all of the band clamps were put back on and are tight, but not so tight they cut into the rubber hose
Inspect every inch of the EVAP system hoses and connections, look for splits or cracks especially at joints and angles....check all of the rubber fittings for tight fit. The smoke test should have reviled just about all of them...
When under the vehicle you shouldn't be able to smell any gasoline.
A bad filler neck hose on your gas tank
a poorly installed fuel pump into the tank (smell for gas)
You can try disconnecting the various EVAP lines and try blowing into them to see if you get leaks ( this is how I found the cracked hose on my wife's mini-van)
if the tank was removed make sure all of the band clamps were put back on and are tight, but not so tight they cut into the rubber hose
October 26th, 2011, 2:38 PM
#100
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Why is GM not covering the EVAP problems when they occur? I have an 07 Tahoe that the gas cap light come on at 32K in New Mexico and when I returned home the mileage had crossd the 36K mark. I explained this to the dealer and they handed me a bill for $150. I inquired about the EVAP part and they said (what happened to 80K for EVAP service?) that particuliar part (solenoid) was not covered. This is BS on GMs part!
Thomas Jachim
PS to pour salt into the wound the same code came up a week later and I had to re-attach the hose to the canister because the tech,that worked on it, didnot push the hose on the canister nipple correctly. Typical!!
Thomas Jachim
PS to pour salt into the wound the same code came up a week later and I had to re-attach the hose to the canister because the tech,that worked on it, didnot push the hose on the canister nipple correctly. Typical!!