Gas Cap Symptoms
Team Owner
Joined: Sep 2001
Posts: 22,582
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From: Denison, TX
2022 C8 of the Year Finalist - Unmodified
CI 3-4-5-6-7-8-9-10 Veteran
St. Jude '03-'04-'05-'06-'07-'08-'09-'10-'16
Does it affect the car at all, though? ie Will that being messed up run down the battery or cause anything to not work?
Team Owner
Joined: Sep 2001
Posts: 22,582
Likes: 251
From: Denison, TX
2022 C8 of the Year Finalist - Unmodified
CI 3-4-5-6-7-8-9-10 Veteran
St. Jude '03-'04-'05-'06-'07-'08-'09-'10-'16
Team Owner
Joined: Sep 2001
Posts: 22,582
Likes: 251
From: Denison, TX
2022 C8 of the Year Finalist - Unmodified
CI 3-4-5-6-7-8-9-10 Veteran
St. Jude '03-'04-'05-'06-'07-'08-'09-'10-'16
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Race Director
Joined: Sep 2000
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From: Missouri City, TX
Le Mans Master
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From: Sandy Eggo Calif.
St. Jude Donor '06-'07-'08-'09-'10-'11-'12, '16
If it comes back on after the cap, it might be something more serious. Mine came back after a new cap and I discovered a broken evaporator line.
Race Director
Joined: Sep 2000
Posts: 11,142
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From: Missouri City, TX
My 06Z06 set the Check Gas Cap light twice this morning for the first time in over 4 years of ownership. It came on again the second time after I stopped and gave the cap a few more twists. When I got to the office this morning, I took it completely off and reinstalled it. I'll have to see it that resolves it this pm. I have twice in the past got Check Engine lights also due to the gas cap. It might be time for a new gas cap.
Race Director
Joined: Dec 2013
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Little trick if it's just the gas cap, and that is to pull the O ring seal on the cap, clean it and give it a light rub down of dielectric grease and reinstall it. Also, take a few mins to wide down the ring on the car where the fill cap is going to seal against.
Attachment 48333755
As for really what is going on, when you go to start the car, the Rear tank solinoid vavle is closes so no air can leak out of it, the front vent solinoid is helps closed, and the fuel vent lines are pressure leak tested to make sure it holding pressure. So if say the tank canistor solinoid vavle is not closing all the way, or there is a small leak in the air side of the lines (like a loose gas cap or it seal not sealing off all the way), you get the gas cap light.
This is the reason that when you get the light, want to pull the codes to make sure the problem is pointing you back to air pressure problem like cap not sealing off that cause the problem (P0442 or P0455), and not say a corroded C186 connector next to the side of the battery for the rear solenoid that is causing the electrical problem isntead.
P0442 Evaporative Emission (EVAP) System Small Leak Detected ECM
P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit ECM
P0446 Evaporative Emission (EVAP) Vent System Performance ECM
P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit ECM
P0451 Fuel Tank Pressure (FTP) Sensor Performance ECM
P0452 Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage ECM
P0453 Fuel Tank Pressure (FTP) Sensor Circuit High Voltage ECM
P0454 Fuel Tank Pressure (FTP) Sensor Circuit Intermittent ECM
P0455 Evaporative Emission (EVAP) System Large Leak Detected ECM
