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P0455 Evap Gross leak/No Flow

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2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHP0455 Evap Gross leak/No Flow

Leading reported evidence

Use supposed correct fitment one

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

changed it out for a new one (all though I used a supposed correct fitment one from the local parts store.)....

Original post Read captured discussion
P0455 Evap Gross leak/No Flow
Frequently discussed work

Check fuel cap

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

First thing was to check the fuel cap for cracks on the o-ring etc.

Original post Read captured discussion
P0455 Evap Gross leak/No Flow
Read full discussion summary

Leading evidence: 'Use supposed correct fitment one' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuel cap' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 2 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Check fuel cap

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

First thing was to check the fuel cap for cracks on the o-ring etc.

Original post Read captured discussion
P0455 Evap Gross leak/No Flow

Reset code, and comes right back

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

reset code, and comes right back.

Original post Read captured discussion
P0455 Evap Gross leak/No Flow
Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check fuel cap

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

First thing was to check the fuel cap for cracks on the o-ring etc.

Original post Read captured discussion
P0455 Evap Gross leak/No Flow

Reset code, and comes right back

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

reset code, and comes right back.

Original post Read captured discussion
P0455 Evap Gross leak/No Flow

Use supposed correct fitment one

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

changed it out for a new one (all though I used a supposed correct fitment one from the local parts store.)....

Original post Read captured discussion
P0455 Evap Gross leak/No Flow
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T150039Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

So, last fall right before i put my 99 c2 away for winter hibernation, the check engine light came on and told me it had a P0455 Evap Emissions System Leak detected (Gross leak/No flow) First thing was to check the fuel cap for cracks on the o-ring etc. I did, and it was very weathered and cracked. changed it out for a new one (all though I used a supposed correct fitment one from the local parts store.).... reset code, and comes right back. Ok do some more research, and seems that many people need to replace the Fuel tank bleeder valve thats right directly behind the fender (pictured). i replaced that as the video on Pelican parts shows. and, the code comes right back again. one thing im curious, is for the people that have replaced that, what the heck makes that little valve in it function. i though it would open and close with the flap on the fuel filler neck. i saw no way that it could... there is also a difference between this 99 c2, and my 01 996tt. when i push on the flapper valve on my 996tt, i hear something clicking open in a valve or something back inside the fender. but i do not believe my 996 c2 is designed the same...? any ideas of something else i should be looking at to eliminate this code?! The car will be going up for sale soon, And even though we have no testing or any opf that like many of you do, to register a vehicle for the road, the car runs great, and i'd rather not scare off potential buyers because of an engine light for something so silly... any help would be great. thanks!

POST 2Original post

https://www.renntech.org/forums/topi...code-is-p0455/ https://www.renntech.org/forums/topi...sche-error-94/

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