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Old 09-16-2010, 11:57 PM   #1
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Tighten Gas Cap

"Tighten Gas Cap" every time I drive. :upset: I read somewhere that the Camaro does a self test every every cycle (~5 miles after startup) and that does feel about when the message comes on in the DIC.

That thing cannot get any tighter. I just filled up my third tank of gas since taking delivery and the cap feels tight. I've taken it off and replaced it a number of times, and twisted it till it clicks. I've even attempted to keep twisting, but there's no way it will turn any further.

Took it to the dealer last Saturday along with the creaking drivers seat issue, and they ran fuel system check and everything passed. They cleared the code. Sure enough it came back on the following day, and no the gas cap had not been removed in that time.

Anyone else experiencing similar on the new 11s? I read a good amount on the older 10s, but haven't seen anything mentioned recent.
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Old 09-17-2010, 12:25 AM   #2
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bad cap I bet.
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Old 09-19-2010, 08:57 AM   #3
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bad cap I bet.
sounds like it to me too.
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Old 09-19-2010, 10:56 AM   #4
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We had the same problem with one of our G8's. It turned out that the connector on the filler tube was not seated all the way.
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Old 10-01-2010, 05:51 PM   #5
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So update:
I took it to the dealer this afternoon (3rd time) and they tested it for 3 hours and found no physical problems with the fuel system at all. On visit 2 they replaced the sensor thinking that may be faulty.

The problem is it keeps throwing code P0455 for Large Evap leak, but there's no leak. They cleared the codes and nothing came back during the 3 hours it was being tested, and nothing in the hour long drive back from the dealer either.

They've offered that if it happens again that they will be contacting Chevy's Technical Service to get them involved. My hunch is that it's software as the warning comes up during the system self test while driving, but they updated the ECM twice already.
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Old 10-01-2010, 07:16 PM   #6
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Easy enough to turn the DIC warning off w/HP Tuners or EFI Live.....just that specific warning.
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Old 10-01-2010, 08:31 PM   #7
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Did they do a smoke test?

It's not the software. Every one has the same software. It's a hard part failure, something like a hose off for that code. With a brand new car, the most likely cause is an assembly issue like an evap hose not connected properly.
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Old 10-01-2010, 08:41 PM   #8
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We cheated...



Hope you get it figured out.
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Old 10-02-2010, 12:21 AM   #9
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Quote:
Originally Posted by Russell James View Post
Did they do a smoke test?

It's not the software. Every one has the same software. It's a hard part failure, something like a hose off for that code. With a brand new car, the most likely cause is an assembly issue like an evap hose not connected properly.
All hoses are connected, they ran a smoke test on 3 separate occasions, no leaks anywhere, not even any micro leaks. They specifically checked the evap hose and thats fine. This code is supposed to indicate a large leak, but that's the problem - there is no leak.


My thoughts are that since there's no physical leak, but the system thinks there is one, the problem lies within the notification system. They replaced the sensor last week thinking it may have been faulty. The next biggest common factor is the programming.

And tuning out the CEL so it doesn't throw a code (even only a specific one) is not an option. I can understand if its loaded full of aftermarket parts, but this one's 100% stock.
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Old 10-02-2010, 07:46 AM   #10
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Below is the description on how the diagnostic check is run.

It involves 2 solenoids, vacuum line, wiring, ECM, and the tank pressure sensor.

Smoke showed no leak, changed the sensor, I assume they tested the cap and neck sealing surface. That leaves the possibilities as;

a pinched vacuum line/restriction
bad solenoid
a wiring open, short or ground

The service manual has a procedure to hook up the special tools and run several test procedures while manually triggering the diagnostic test.

They'd monitor the vacuum while the test is being run. That will rule out restrictions and leaks. If there are no restrictions and leaks, and both solenoids are operating to create the vacuum... then the signal back to the ECM needs to be checked to see if the sensor is telling the ECM that a vacuum was achieved. If there is no signal at the ECM, the wiring/grounds needs to be checked.


Description from the Service Manual:


"This diagnostic creates a vacuum condition in the EVAP system. When the enabling criteria has been met, the control module commands the normally open EVAP canister vent solenoid valve closed and the EVAP purge solenoid valve open, creating a vacuum in the EVAP system. The ECM then monitors the fuel tank pressure sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time. Failure to achieve the expected level of vacuum indicates the presence of a large leak in the EVAP system or a restriction in the purge path. The ECM will log a fault if it detects a weaker than expected vacuum level under these test conditions."
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Old 10-02-2010, 04:17 PM   #11
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Quote:
Originally Posted by Stett View Post
"Tighten Gas Cap" every time I drive. :upset: I read somewhere that the Camaro does a self test every every cycle (~5 miles after startup) and that does feel about when the message comes on in the DIC.

That thing cannot get any tighter. I just filled up my third tank of gas since taking delivery and the cap feels tight. I've taken it off and replaced it a number of times, and twisted it till it clicks. I've even attempted to keep twisting, but there's no way it will turn any further.

Took it to the dealer last Saturday along with the creaking drivers seat issue, and they ran fuel system check and everything passed. They cleared the code. Sure enough it came back on the following day, and no the gas cap had not been removed in that time.

Anyone else experiencing similar on the new 11s? I read a good amount on the older 10s, but haven't seen anything mentioned recent.
YES!!!
I'm having exactly the same problem!

Started at 80 miles 10 days ago and I was back in the dealership today for the 3rd time with this exact problem. I have a 2011 2LT/RS.
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Old 10-03-2010, 10:26 AM   #12
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Quote:
Originally Posted by SC2150 View Post
Easy enough to turn the DIC warning off w/HP Tuners or EFI Live.....just that specific warning.
So you're saying to mask that code I should spend $400-$800 for a top-end scanner tunning tool? Give me a break! I'd love to turn off the code and mask it for all time, but not for that cost. How about a suggestion that's a little less expensive.

Last edited by pennor; 10-04-2010 at 04:02 PM.
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Old 10-07-2010, 09:34 AM   #13
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UPDATE:

Well, our 2011 went back to the dealer yesterday with the complete text of this forum subject. The service manager and tech assinged to the car were very interested in the fact that there are two Camaros, both built on the same day, with exactly the same problem. They promised me the car by late afternoon but have decided to keep it overnight so they can do further test when the system is stone cold. They seem to be narrowing in on a bad selenoid on the evaporative canister.

Stand by here, I'll keep you posted as they learn more.
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Old 10-07-2010, 09:36 AM   #14
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Has the dealer tried replacing the gas cap (for either of you)? If not, you might suggest that...
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Old 10-07-2010, 10:31 AM   #15
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Oh yes... That was the very first thing they did for me. And a smoke test too.
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Old 10-07-2010, 10:43 AM   #16
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I wonder if there is a program update to eliminate false code settings?
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Old 10-07-2010, 11:12 AM   #17
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Is this the same thing as code PO496
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Old 10-07-2010, 05:08 PM   #18
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OK, here's my final answer

Yes the computer was upgraded and the gas cap replaced at the first visit. during that visit they also did a smoke test and found a disconnected vacuum hose on the evap. canister. Those things were all done and I was sent on my way. The next morning, same message, same code.

Back to the dealer it went this week. They spent 2 days on it. I assume with GM Tech Support assistance this time. Here's what they found and I quote from the service invoice:
A CHECK ENGINE LIGHT ON AND TIGHTEN GAS CAP MESSAGE COMES ON, CAUSE: E

712 P0455, PERFORMED EVAP SYSTEM TEST TO LOCATE LEAK IN PURGE VALVES, REPLACED VALVE, RETESTED AND PASSED.
So that's where things are this afternoon. So far so good. We may have it fixed. I'll give it another day or two before I declare complete victory.
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Old 10-12-2010, 01:49 AM   #19
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Here's my latest:
Last Friday (10/1) I believe it was, I went back to the dealer because low and behold it came back. They cleared the code and tested it for 3 hours... it was giving P0455 large evap leak as well. They replaced a solenoid the previous visit... it was either a solenoid or purge valve something of the sort, can't remember and the paperwork is .. around here somewhere.

They never mentioned directly the evap hose, but did say that everything was connected and sealed, and no leaks large or small were found.

So entire week goes by almost, Friday i get the "tighten gas cap" message again while driving out to lunch. I call them up, they want me to bring it back.

So here's the interesting turn of events... I haven't had the chance to go back, and may not till next week, but the check engine light that came on soon thereafter... decided to turn off today, on its own.

What the hell!!!
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Old 10-12-2010, 01:53 AM   #20
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Quote:
Originally Posted by pennor View Post
OK, here's my final answer

Yes the computer was upgraded and the gas cap replaced at the first visit. during that visit they also did a smoke test and found a disconnected vacuum hose on the evap. canister. Those things were all done and I was sent on my way. The next morning, same message, same code.

Back to the dealer it went this week. They spent 2 days on it. I assume with GM Tech Support assistance this time. Here's what they found and I quote from the service invoice:
A CHECK ENGINE LIGHT ON AND TIGHTEN GAS CAP MESSAGE COMES ON, CAUSE: E

712 P0455, PERFORMED EVAP SYSTEM TEST TO LOCATE LEAK IN PURGE VALVES, REPLACED VALVE, RETESTED AND PASSED.
So that's where things are this afternoon. So far so good. We may have it fixed. I'll give it another day or two before I declare complete victory.
I may have found a way to "force" the issue so to speak. Seems that for me it only comes on when the vehicle is running its self test. The service manager advised me that it only runs this self test if the vehicle is going below 3 mph or idling. Im not sure if 3mph is the exact cutoff, maybe he meant 30.. but I idled for about 10 minutes while I ate my lunch in the car, then went for a drive through a 25-mph neighborhood on Friday when it came back on.

The rest of the week I'd been driving at normal speeds (35-45mph) and no warnings.

Here's to hoping we can make sense of this
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Old 10-12-2010, 10:06 AM   #21
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Speed is not one of the criteria for running the P0455 large leak self test.

The service manual lists the criteria for running the self test, which can also be manually triggered using a scan tool.

The self test is run once every cold start, and there is a number of criteria such as fuel level between 10-90%, temp and baro criteria.... a bunch more, but speed is not one of them.

The service manual has a step by step diagnostic to determine what caused the self test to fail. With the test equipment hooked up, you trigger the self test with the scan tool, and the results should be obvious.
If they have all the special tools ( the service manual lists 7 required ) I don't see why this can't be easily diagnosed.

Either they are not using all the special tools as required, or not following the service manual.
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Old 10-12-2010, 12:52 PM   #22
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The problem has been found and corrected. They found a bad purge valve on the evap. canister and replaced it. It's been about 5 days now with no problems. I'm declaring victory.
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Old 10-14-2010, 11:03 AM   #23
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I just took my 2011 LS into the dealer for the exact same code (P0455). They ran a smoke test and couldnt detect any leaks. They also said the gas cap was not defective and they cleared the code. We'll see how long it lasts. My car is only 2.5 weeks old.
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Old 10-14-2010, 05:07 PM   #24
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I just took my 2011 LS into the dealer for the exact same code (P0455). They ran a smoke test and couldnt detect any leaks. They also said the gas cap was not defective and they cleared the code. We'll see how long it lasts. My car is only 2.5 weeks old.
From what I have been able to figure out I don't think that a smoke test will find anything. My problem seems have been that the purge valve would not close and seal completely to make a vacuum in the system. Replacing that valve seems have corrected the issue. There may have been a bad bunch of those valves come from the supplier.
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Old 10-14-2010, 08:52 PM   #25
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Note the cap says click only once,
If you click it twice, your car may be ruined forever!
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