Question on Check Gas Cap error
07-23-2014, 08:07 PM
#1
Racer
Thread Starter
Question on Check Gas Cap error
Last weekend, my 2005 started showing "Check Gas Cap" warning on the DIC. I checked the cap and it seemed a little loose, so I took it off and put it back on (I've read the threads about lightly inserting and turning it for about three clicks). Got back in, reset the DIC (pressed the reset button), and after I started again, the warning came back.
I purchased a new cap and installed it tonight. It fits good, but everytime I start, I still get the Check Gas Cap warning.
My question: I'm about to go on a trip (about 600 miles). If I continue to drive it with this condition, will I just have to keep "resetting" the DIC or will it eventually put it in limp home mode?
I purchased a new cap and installed it tonight. It fits good, but everytime I start, I still get the Check Gas Cap warning.
My question: I'm about to go on a trip (about 600 miles). If I continue to drive it with this condition, will I just have to keep "resetting" the DIC or will it eventually put it in limp home mode?
07-23-2014, 08:31 PM
#2
Tech Contributor
Member Since: Oct 1999
Location: Charlotte, NC (formerly Endicott, NY)
Posts: 40,096
Received 8,930 Likes
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5,334 Posts
It won't put the car in limp home mode. All that error does is tell you there is a problem with the fuel system sealing and that you are polluting the air. The problem doesn't have to be the gas cap. It could be anywhere in the fuel system where there is a leak.
From the FSM:
Evaporative Emission Control System Description
EVAP System Operation
The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent solenoid valve to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the control module will command the EVAP purge solenoid valve ON, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent solenoid valve OFF, fresh air is drawn through the vent solenoid valve and the vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge solenoid valve into the intake manifold to be consumed during normal combustion. The control module uses several tests to determine if the EVAP system is leaking.
Large Leak Test
This tests for large leaks and restrictions to the purge path in the evaporative emission (EVAP) system. When the enabling criteria has been met, the control module commands the EVAP vent solenoid valve ON and the EVAP purge solenoid valve ON, allowing vacuum into the EVAP system. The control module monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time.
Small Leak Test
The engine off natural vacuum (EONV) diagnostic is the small-leak detection diagnostic for the evaporative emission (EVAP) system. While previous leak detection methods were performed with the engine running, the EONV diagnostic monitors the EVAP system pressure or vacuum with the ignition OFF. Because of this, it may be normal for the control module to remain active for up to 40 minutes after the ignition is turned OFF. This is important to remember when performing a parasitic draw test on vehicles equipped with EONV.
The EONV utilizes the temperature changes in the fuel tank immediately following a drive cycle to use the naturally occurring vacuum or pressure in the fuel tank. When the vehicle is driven, the temperature rises in the tank. After the vehicle is parked, the temperature in the tank continues to rise for a period of time, then starts to drop. The EONV diagnostic relies on this temperature change and the corresponding pressure change in a sealed system, to determine if an EVAP system leak is present.
The EONV diagnostic is designed to detect leaks as small as 0.51 mm (0.020 in). The diagnostic can determine if a small leak is present based on vacuum or pressure readings in the EVAP system. When the system is sealed, a finite amount of pressure or vacuum will be observed. When a 0.51 mm (0.020 in) leak is present, often little or no pressure or vacuum is observed. If the test reports a failing value, DTC P0442 will set.
Canister Vent Restriction Test
If the evaporative emission (EVAP) vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. The control module tests this by commanding the EVAP purge solenoid valve ON, commanding the EVAP vent solenoid valve OFF, and monitoring the fuel tank pressure (FTP) sensor for an increase in vacuum. If the vacuum increases more than a calibrated value, DTC P0446 will set.
Purge Solenoid Valve Leak Test
If the evaporative emission (EVAP) purge solenoid valve does not seal properly fuel vapors could enter the engine at an undesired time, causing driveability concerns. The control module tests for this by commanding the EVAP purge solenoid valve OFF and the vent solenoid valve ON, sealing the system, and monitors the fuel tank pressure (FTP) for an increase in vacuum. If the control module detects that the EVAP system vacuum increases above a calibrated value, DTC P0496 will set.
Check Gas Cap Message
The control module sends a class 2 message to the driver information center (DIC) illuminating the Check Gas Cap message when a malfunction in the evaporative emission (EVAP) system and a large leak test fails.
EVAP System Components
The evaporative emission (EVAP) system consists of the following components:
EVAP Canister
The canister is filled with carbon pellets used to absorb and store fuel vapors. Fuel vapor is stored in the canister until the control module determines that the vapor can be consumed in the normal combustion process.
EVAP Purge Solenoid Valve
The EVAP purge solenoid valve controls the flow of vapors from the EVAP system to the intake manifold. The purge solenoid valve opens when commanded ON by the control module. This normally closed valve is pulse width modulated (PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP testing, allowing engine vacuum to enter the EVAP system.
EVAP Vent Solenoid Valve
The EVAP vent solenoid valve controls fresh airflow into the EVAP canister. The valve is normally open. The control module commands the valve ON, closing the valve during some EVAP tests, allowing the system to be tested for leaks.
Fuel Tank Pressure Sensor
The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure.
Bill
From the FSM:
Evaporative Emission Control System Description
EVAP System Operation
The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent solenoid valve to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the control module will command the EVAP purge solenoid valve ON, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent solenoid valve OFF, fresh air is drawn through the vent solenoid valve and the vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge solenoid valve into the intake manifold to be consumed during normal combustion. The control module uses several tests to determine if the EVAP system is leaking.
Large Leak Test
This tests for large leaks and restrictions to the purge path in the evaporative emission (EVAP) system. When the enabling criteria has been met, the control module commands the EVAP vent solenoid valve ON and the EVAP purge solenoid valve ON, allowing vacuum into the EVAP system. The control module monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time.
Small Leak Test
The engine off natural vacuum (EONV) diagnostic is the small-leak detection diagnostic for the evaporative emission (EVAP) system. While previous leak detection methods were performed with the engine running, the EONV diagnostic monitors the EVAP system pressure or vacuum with the ignition OFF. Because of this, it may be normal for the control module to remain active for up to 40 minutes after the ignition is turned OFF. This is important to remember when performing a parasitic draw test on vehicles equipped with EONV.
The EONV utilizes the temperature changes in the fuel tank immediately following a drive cycle to use the naturally occurring vacuum or pressure in the fuel tank. When the vehicle is driven, the temperature rises in the tank. After the vehicle is parked, the temperature in the tank continues to rise for a period of time, then starts to drop. The EONV diagnostic relies on this temperature change and the corresponding pressure change in a sealed system, to determine if an EVAP system leak is present.
The EONV diagnostic is designed to detect leaks as small as 0.51 mm (0.020 in). The diagnostic can determine if a small leak is present based on vacuum or pressure readings in the EVAP system. When the system is sealed, a finite amount of pressure or vacuum will be observed. When a 0.51 mm (0.020 in) leak is present, often little or no pressure or vacuum is observed. If the test reports a failing value, DTC P0442 will set.
Canister Vent Restriction Test
If the evaporative emission (EVAP) vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. The control module tests this by commanding the EVAP purge solenoid valve ON, commanding the EVAP vent solenoid valve OFF, and monitoring the fuel tank pressure (FTP) sensor for an increase in vacuum. If the vacuum increases more than a calibrated value, DTC P0446 will set.
Purge Solenoid Valve Leak Test
If the evaporative emission (EVAP) purge solenoid valve does not seal properly fuel vapors could enter the engine at an undesired time, causing driveability concerns. The control module tests for this by commanding the EVAP purge solenoid valve OFF and the vent solenoid valve ON, sealing the system, and monitors the fuel tank pressure (FTP) for an increase in vacuum. If the control module detects that the EVAP system vacuum increases above a calibrated value, DTC P0496 will set.
Check Gas Cap Message
The control module sends a class 2 message to the driver information center (DIC) illuminating the Check Gas Cap message when a malfunction in the evaporative emission (EVAP) system and a large leak test fails.
EVAP System Components
The evaporative emission (EVAP) system consists of the following components:
EVAP Canister
The canister is filled with carbon pellets used to absorb and store fuel vapors. Fuel vapor is stored in the canister until the control module determines that the vapor can be consumed in the normal combustion process.
EVAP Purge Solenoid Valve
The EVAP purge solenoid valve controls the flow of vapors from the EVAP system to the intake manifold. The purge solenoid valve opens when commanded ON by the control module. This normally closed valve is pulse width modulated (PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP testing, allowing engine vacuum to enter the EVAP system.
EVAP Vent Solenoid Valve
The EVAP vent solenoid valve controls fresh airflow into the EVAP canister. The valve is normally open. The control module commands the valve ON, closing the valve during some EVAP tests, allowing the system to be tested for leaks.
Fuel Tank Pressure Sensor
The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure.
Bill
07-23-2014, 09:03 PM
#3
Team Owner
Member Since: Oct 2004
Location: San Clemente CA
Posts: 27,420
Likes: 0
Received 59 Likes
on
48 Posts
It won't put the car in limp home mode. All that error does is tell you there is a problem with the fuel system sealing and that you are polluting the air. The problem doesn't have to be the gas cap. It could be anywhere in the fuel system where there is a leak.
From the FSM:
Evaporative Emission Control System Description
EVAP System Operation
The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent solenoid valve to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the control module will command the EVAP purge solenoid valve ON, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent solenoid valve OFF, fresh air is drawn through the vent solenoid valve and the vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge solenoid valve into the intake manifold to be consumed during normal combustion. The control module uses several tests to determine if the EVAP system is leaking.
Large Leak Test
This tests for large leaks and restrictions to the purge path in the evaporative emission (EVAP) system. When the enabling criteria has been met, the control module commands the EVAP vent solenoid valve ON and the EVAP purge solenoid valve ON, allowing vacuum into the EVAP system. The control module monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time.
Small Leak Test
The engine off natural vacuum (EONV) diagnostic is the small-leak detection diagnostic for the evaporative emission (EVAP) system. While previous leak detection methods were performed with the engine running, the EONV diagnostic monitors the EVAP system pressure or vacuum with the ignition OFF. Because of this, it may be normal for the control module to remain active for up to 40 minutes after the ignition is turned OFF. This is important to remember when performing a parasitic draw test on vehicles equipped with EONV.
The EONV utilizes the temperature changes in the fuel tank immediately following a drive cycle to use the naturally occurring vacuum or pressure in the fuel tank. When the vehicle is driven, the temperature rises in the tank. After the vehicle is parked, the temperature in the tank continues to rise for a period of time, then starts to drop. The EONV diagnostic relies on this temperature change and the corresponding pressure change in a sealed system, to determine if an EVAP system leak is present.
The EONV diagnostic is designed to detect leaks as small as 0.51 mm (0.020 in). The diagnostic can determine if a small leak is present based on vacuum or pressure readings in the EVAP system. When the system is sealed, a finite amount of pressure or vacuum will be observed. When a 0.51 mm (0.020 in) leak is present, often little or no pressure or vacuum is observed. If the test reports a failing value, DTC P0442 will set.
Canister Vent Restriction Test
If the evaporative emission (EVAP) vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. The control module tests this by commanding the EVAP purge solenoid valve ON, commanding the EVAP vent solenoid valve OFF, and monitoring the fuel tank pressure (FTP) sensor for an increase in vacuum. If the vacuum increases more than a calibrated value, DTC P0446 will set.
Purge Solenoid Valve Leak Test
If the evaporative emission (EVAP) purge solenoid valve does not seal properly fuel vapors could enter the engine at an undesired time, causing driveability concerns. The control module tests for this by commanding the EVAP purge solenoid valve OFF and the vent solenoid valve ON, sealing the system, and monitors the fuel tank pressure (FTP) for an increase in vacuum. If the control module detects that the EVAP system vacuum increases above a calibrated value, DTC P0496 will set.
Check Gas Cap Message
The control module sends a class 2 message to the driver information center (DIC) illuminating the Check Gas Cap message when a malfunction in the evaporative emission (EVAP) system and a large leak test fails.
EVAP System Components
The evaporative emission (EVAP) system consists of the following components:
EVAP Canister
The canister is filled with carbon pellets used to absorb and store fuel vapors. Fuel vapor is stored in the canister until the control module determines that the vapor can be consumed in the normal combustion process.
EVAP Purge Solenoid Valve
The EVAP purge solenoid valve controls the flow of vapors from the EVAP system to the intake manifold. The purge solenoid valve opens when commanded ON by the control module. This normally closed valve is pulse width modulated (PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP testing, allowing engine vacuum to enter the EVAP system.
EVAP Vent Solenoid Valve
The EVAP vent solenoid valve controls fresh airflow into the EVAP canister. The valve is normally open. The control module commands the valve ON, closing the valve during some EVAP tests, allowing the system to be tested for leaks.
Fuel Tank Pressure Sensor
The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure.
Bill
From the FSM:
Evaporative Emission Control System Description
EVAP System Operation
The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent solenoid valve to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the control module will command the EVAP purge solenoid valve ON, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent solenoid valve OFF, fresh air is drawn through the vent solenoid valve and the vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge solenoid valve into the intake manifold to be consumed during normal combustion. The control module uses several tests to determine if the EVAP system is leaking.
Large Leak Test
This tests for large leaks and restrictions to the purge path in the evaporative emission (EVAP) system. When the enabling criteria has been met, the control module commands the EVAP vent solenoid valve ON and the EVAP purge solenoid valve ON, allowing vacuum into the EVAP system. The control module monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time.
Small Leak Test
The engine off natural vacuum (EONV) diagnostic is the small-leak detection diagnostic for the evaporative emission (EVAP) system. While previous leak detection methods were performed with the engine running, the EONV diagnostic monitors the EVAP system pressure or vacuum with the ignition OFF. Because of this, it may be normal for the control module to remain active for up to 40 minutes after the ignition is turned OFF. This is important to remember when performing a parasitic draw test on vehicles equipped with EONV.
The EONV utilizes the temperature changes in the fuel tank immediately following a drive cycle to use the naturally occurring vacuum or pressure in the fuel tank. When the vehicle is driven, the temperature rises in the tank. After the vehicle is parked, the temperature in the tank continues to rise for a period of time, then starts to drop. The EONV diagnostic relies on this temperature change and the corresponding pressure change in a sealed system, to determine if an EVAP system leak is present.
The EONV diagnostic is designed to detect leaks as small as 0.51 mm (0.020 in). The diagnostic can determine if a small leak is present based on vacuum or pressure readings in the EVAP system. When the system is sealed, a finite amount of pressure or vacuum will be observed. When a 0.51 mm (0.020 in) leak is present, often little or no pressure or vacuum is observed. If the test reports a failing value, DTC P0442 will set.
Canister Vent Restriction Test
If the evaporative emission (EVAP) vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. The control module tests this by commanding the EVAP purge solenoid valve ON, commanding the EVAP vent solenoid valve OFF, and monitoring the fuel tank pressure (FTP) sensor for an increase in vacuum. If the vacuum increases more than a calibrated value, DTC P0446 will set.
Purge Solenoid Valve Leak Test
If the evaporative emission (EVAP) purge solenoid valve does not seal properly fuel vapors could enter the engine at an undesired time, causing driveability concerns. The control module tests for this by commanding the EVAP purge solenoid valve OFF and the vent solenoid valve ON, sealing the system, and monitors the fuel tank pressure (FTP) for an increase in vacuum. If the control module detects that the EVAP system vacuum increases above a calibrated value, DTC P0496 will set.
Check Gas Cap Message
The control module sends a class 2 message to the driver information center (DIC) illuminating the Check Gas Cap message when a malfunction in the evaporative emission (EVAP) system and a large leak test fails.
EVAP System Components
The evaporative emission (EVAP) system consists of the following components:
EVAP Canister
The canister is filled with carbon pellets used to absorb and store fuel vapors. Fuel vapor is stored in the canister until the control module determines that the vapor can be consumed in the normal combustion process.
EVAP Purge Solenoid Valve
The EVAP purge solenoid valve controls the flow of vapors from the EVAP system to the intake manifold. The purge solenoid valve opens when commanded ON by the control module. This normally closed valve is pulse width modulated (PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP testing, allowing engine vacuum to enter the EVAP system.
EVAP Vent Solenoid Valve
The EVAP vent solenoid valve controls fresh airflow into the EVAP canister. The valve is normally open. The control module commands the valve ON, closing the valve during some EVAP tests, allowing the system to be tested for leaks.
Fuel Tank Pressure Sensor
The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure.
Bill
Last edited by VET4LES; 07-23-2014 at 09:18 PM.
07-23-2014, 09:10 PM
#4
Racer
Thread Starter
Thanks Bill. This gives me time after the trip to figure out what's the problem.
I don't know what's with my Corvettes: they always seem to through up problems right before I'm going on a trip!
I don't know what's with my Corvettes: they always seem to through up problems right before I'm going on a trip!
07-24-2014, 07:01 AM
#5
Le Mans Master
Only one thing missed. I believe it takes 10 cold start - warm up cycles for the car to clear the codes and reset. A code reader can reset them. Have Autozone or some other free code reading place reset before wasting a lot of time tracing an issue that went away when you first tightened the old cap.
07-24-2014, 07:44 AM
#7
Pro
Can he just remove the negative batt. cable for a minute or so & clear it? Then reset his windows of course.
08-01-2014, 11:41 AM
#8
Retired & lovin' it!
Les....do you happen to have a copy of this letter that you could scan & send to an email address (or perhaps as an attachment to a PM)? My '05 has just started to display the same "Check Gas Cap" message & I was about to order an OEM ACDelco from Rock Auto, but if I can get one free from GM, that's even better. Thanks....Dave
08-01-2014, 12:25 PM
#9
Race Director
Les....do you happen to have a copy of this letter that you could scan & send to an email address (or perhaps as an attachment to a PM)? My '05 has just started to display the same "Check Gas Cap" message & I was about to order an OEM ACDelco from Rock Auto, but if I can get one free from GM, that's even better. Thanks....Dave
--------------------------------------------------------------------------------
GM SERVICE AND PARTS OPERATIONS DCS2092
URGENT DISTRIBUTE IMMEDIATELY
Date: August 11, 2008
Subject: 07301 – Special Coverage Adjustment
Fuel Tank Filler Cap
Models: 2005 Chevrolet Corvette
2005 Pontiac GTO
Equipped with 6.0L V8 (RPO LS2 – VIN U) Engine
PRODUCT FIELD ACTION ANNOUNCEMENT
General Motors is announcing Special Coverage Adjustment 07301 today. The total number of VINS involved is 48,406.
Some customers of 2005 model year Chevrolet Corvette and Pontiac GTO vehicles, equipped with a 6.0L V8 (RPO LS2 – VIN U) engine, may experience a condition where the fuel tank filler cap won’t tighten properly, or the fuel tank filler cap won’t come off, or is broken. These conditions may also cause the illumination of the Malfunction Indicator Light (MIL).
This special coverage covers the condition described above for a period of 10 years or 120,000 miles (193,000 km), whichever comes first, from the date the vehicle was originally placed into service, regardless of ownership. The repairs will be made at no charge to the customer.
Customer Letter Mailing
Customer letter mailing will begin on August 18, 2008.
GMVIS Information
GMVIS information is not loaded for Special Coverages.
Service Information System (SI)
Bulletin 07301 will be available in SI on August 12, 2008.
________________________________________ _______
EI07238 -- Fuel Cap May Not Seal, MIL/SES Light Illuminated with DTC P0442 - Evaporative Emission (EVAP) System Small Leak Detected and/or P0455 - Evaporative Emission (EVAP) System Large Leak Detected
Models: 2005-2007 Cadillac XLR, XLR-V
2005-2007 Chevrolet Corvette
Attention:
Proceed with this bulletin ONLY if the customer has commented about this concern AND the EI number is listed in GMVIS. If the customer has not commented about this condition or the EI does not show in GMVIS, disregard the bulletin and proceed with diagnostics found in the published Service Information. THIS IS NOT A RECALL--refer to Service Bulletin 04-00-89-053B for more detail on the use of Engineering Information Bulletins.
This bulletin is being revised to add additional EVAP test information. Please discard Corporate Bulletin Number 07-06-04-022D (Section 06 -- Engine/Propulsion System).
ConditionSome customers may comment on a Service Engine Soon (SES) Light illuminated on the IP cluster and the fuel cap does not seal or tighten. Technicians may find DTC P0442 and/or P0455 set.
What Action to Take
GM Engineering is attempting to determine the root cause for fuel caps not sealing and/or setting codes P0442 or P0455. GM Engineering has a need to obtain information first hand from the dealer technician during diagnosis and before repair.
As a result, this information will be used by engineering to "root cause" the customer's concern and develop/validate a field fix. Please follow the instructions below regarding the requested information.
InstructionsImportant:
If a vehicle is encountered with the above concern, complete the following steps; making sure all the information is documented on the Repair Order.
Verify that the VIN and mileage is accurate.
Accurately document the customers concern. If the SES light is illuminated, record the Diagnostic Trouble Codes (DTC) using a Tech 2®.
Important: DO NOT use fuel tank filler pipe/neck test adapters, fuel cap testers or smog machines when trying to root cause the EVAP leak.
Perform the EVAP Smoke Test using the service port at the engine side ONLY. The fuel cap needs to be on the fuel tank filler pipe/neck when performing the EVAP Smoke Test.
• If DTC P0442 - Evaporative Emission (EVAP) System Small Leak Detected is stored, proceed to diagnosis DTC P0442 in SI.
• If DTC P0455 - Evaporative Emission (EVAP) System Large Leak Detected is stored, proceed to diagnosis DTC P0455 in SI.
• If diagnostics lead to repair other components not related to the fuel tank filler pipe neck or fuel cap, repair accordingly and disregard this bulletin.
If the diagnostics lead to a leak at the fuel tank filler pipe neck or the fuel cap area, inspect for the following conditions:
• Inspect the condition of the fuel cap by looking for small cracks or any damaged components.
• Inspect the fuel cap seal for distortion or cuts.
• Inspect the fuel filler neck sealing surface for gouges or dents produced accidentally by a fuel nozzle.
08-01-2014, 05:50 PM
#10
Team Owner
Only one thing missed. I believe it takes 10 cold start - warm up cycles for the car to clear the codes and reset. A code reader can reset them. Have Autozone or some other free code reading place reset before wasting a lot of time tracing an issue that went away when you first tightened the old cap.
Don't expect the message to clear immediately after you fix the gas cap...it takes a few cycles. Either way it won't have any effect on your trip.
08-01-2014, 10:11 PM
#11
Team Owner
Member Since: Oct 2004
Location: San Clemente CA
Posts: 27,420
Likes: 0
Received 59 Likes
on
48 Posts
07301 – Special Coverage Adjustment - Fuel Tank Filler Cap
--------------------------------------------------------------------------------
GM SERVICE AND PARTS OPERATIONS DCS2092
URGENT DISTRIBUTE IMMEDIATELY
Date: August 11, 2008
Subject: 07301 – Special Coverage Adjustment
Fuel Tank Filler Cap
Models: 2005 Chevrolet Corvette
2005 Pontiac GTO
Equipped with 6.0L V8 (RPO LS2 – VIN U) Engine
PRODUCT FIELD ACTION ANNOUNCEMENT
General Motors is announcing Special Coverage Adjustment 07301 today. The total number of VINS involved is 48,406.
Some customers of 2005 model year Chevrolet Corvette and Pontiac GTO vehicles, equipped with a 6.0L V8 (RPO LS2 – VIN U) engine, may experience a condition where the fuel tank filler cap won’t tighten properly, or the fuel tank filler cap won’t come off, or is broken. These conditions may also cause the illumination of the Malfunction Indicator Light (MIL).
This special coverage covers the condition described above for a period of 10 years or 120,000 miles (193,000 km), whichever comes first, from the date the vehicle was originally placed into service, regardless of ownership. The repairs will be made at no charge to the customer.
Customer Letter Mailing
Customer letter mailing will begin on August 18, 2008.
GMVIS Information
GMVIS information is not loaded for Special Coverages.
Service Information System (SI)
Bulletin 07301 will be available in SI on August 12, 2008.
________________________________________ _______
EI07238 -- Fuel Cap May Not Seal, MIL/SES Light Illuminated with DTC P0442 - Evaporative Emission (EVAP) System Small Leak Detected and/or P0455 - Evaporative Emission (EVAP) System Large Leak Detected
Models: 2005-2007 Cadillac XLR, XLR-V
2005-2007 Chevrolet Corvette
Attention:
Proceed with this bulletin ONLY if the customer has commented about this concern AND the EI number is listed in GMVIS. If the customer has not commented about this condition or the EI does not show in GMVIS, disregard the bulletin and proceed with diagnostics found in the published Service Information. THIS IS NOT A RECALL--refer to Service Bulletin 04-00-89-053B for more detail on the use of Engineering Information Bulletins.
This bulletin is being revised to add additional EVAP test information. Please discard Corporate Bulletin Number 07-06-04-022D (Section 06 -- Engine/Propulsion System).
ConditionSome customers may comment on a Service Engine Soon (SES) Light illuminated on the IP cluster and the fuel cap does not seal or tighten. Technicians may find DTC P0442 and/or P0455 set.
What Action to Take
GM Engineering is attempting to determine the root cause for fuel caps not sealing and/or setting codes P0442 or P0455. GM Engineering has a need to obtain information first hand from the dealer technician during diagnosis and before repair.
As a result, this information will be used by engineering to "root cause" the customer's concern and develop/validate a field fix. Please follow the instructions below regarding the requested information.
InstructionsImportant:
If a vehicle is encountered with the above concern, complete the following steps; making sure all the information is documented on the Repair Order.
Verify that the VIN and mileage is accurate.
Accurately document the customers concern. If the SES light is illuminated, record the Diagnostic Trouble Codes (DTC) using a Tech 2®.
Important: DO NOT use fuel tank filler pipe/neck test adapters, fuel cap testers or smog machines when trying to root cause the EVAP leak.
Perform the EVAP Smoke Test using the service port at the engine side ONLY. The fuel cap needs to be on the fuel tank filler pipe/neck when performing the EVAP Smoke Test.
• If DTC P0442 - Evaporative Emission (EVAP) System Small Leak Detected is stored, proceed to diagnosis DTC P0442 in SI.
• If DTC P0455 - Evaporative Emission (EVAP) System Large Leak Detected is stored, proceed to diagnosis DTC P0455 in SI.
• If diagnostics lead to repair other components not related to the fuel tank filler pipe neck or fuel cap, repair accordingly and disregard this bulletin.
If the diagnostics lead to a leak at the fuel tank filler pipe neck or the fuel cap area, inspect for the following conditions:
• Inspect the condition of the fuel cap by looking for small cracks or any damaged components.
• Inspect the fuel cap seal for distortion or cuts.
• Inspect the fuel filler neck sealing surface for gouges or dents produced accidentally by a fuel nozzle.
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GM SERVICE AND PARTS OPERATIONS DCS2092
URGENT DISTRIBUTE IMMEDIATELY
Date: August 11, 2008
Subject: 07301 – Special Coverage Adjustment
Fuel Tank Filler Cap
Models: 2005 Chevrolet Corvette
2005 Pontiac GTO
Equipped with 6.0L V8 (RPO LS2 – VIN U) Engine
PRODUCT FIELD ACTION ANNOUNCEMENT
General Motors is announcing Special Coverage Adjustment 07301 today. The total number of VINS involved is 48,406.
Some customers of 2005 model year Chevrolet Corvette and Pontiac GTO vehicles, equipped with a 6.0L V8 (RPO LS2 – VIN U) engine, may experience a condition where the fuel tank filler cap won’t tighten properly, or the fuel tank filler cap won’t come off, or is broken. These conditions may also cause the illumination of the Malfunction Indicator Light (MIL).
This special coverage covers the condition described above for a period of 10 years or 120,000 miles (193,000 km), whichever comes first, from the date the vehicle was originally placed into service, regardless of ownership. The repairs will be made at no charge to the customer.
Customer Letter Mailing
Customer letter mailing will begin on August 18, 2008.
GMVIS Information
GMVIS information is not loaded for Special Coverages.
Service Information System (SI)
Bulletin 07301 will be available in SI on August 12, 2008.
________________________________________ _______
EI07238 -- Fuel Cap May Not Seal, MIL/SES Light Illuminated with DTC P0442 - Evaporative Emission (EVAP) System Small Leak Detected and/or P0455 - Evaporative Emission (EVAP) System Large Leak Detected
Models: 2005-2007 Cadillac XLR, XLR-V
2005-2007 Chevrolet Corvette
Attention:
Proceed with this bulletin ONLY if the customer has commented about this concern AND the EI number is listed in GMVIS. If the customer has not commented about this condition or the EI does not show in GMVIS, disregard the bulletin and proceed with diagnostics found in the published Service Information. THIS IS NOT A RECALL--refer to Service Bulletin 04-00-89-053B for more detail on the use of Engineering Information Bulletins.
This bulletin is being revised to add additional EVAP test information. Please discard Corporate Bulletin Number 07-06-04-022D (Section 06 -- Engine/Propulsion System).
ConditionSome customers may comment on a Service Engine Soon (SES) Light illuminated on the IP cluster and the fuel cap does not seal or tighten. Technicians may find DTC P0442 and/or P0455 set.
What Action to Take
GM Engineering is attempting to determine the root cause for fuel caps not sealing and/or setting codes P0442 or P0455. GM Engineering has a need to obtain information first hand from the dealer technician during diagnosis and before repair.
As a result, this information will be used by engineering to "root cause" the customer's concern and develop/validate a field fix. Please follow the instructions below regarding the requested information.
InstructionsImportant:
If a vehicle is encountered with the above concern, complete the following steps; making sure all the information is documented on the Repair Order.
Verify that the VIN and mileage is accurate.
Accurately document the customers concern. If the SES light is illuminated, record the Diagnostic Trouble Codes (DTC) using a Tech 2®.
Important: DO NOT use fuel tank filler pipe/neck test adapters, fuel cap testers or smog machines when trying to root cause the EVAP leak.
Perform the EVAP Smoke Test using the service port at the engine side ONLY. The fuel cap needs to be on the fuel tank filler pipe/neck when performing the EVAP Smoke Test.
• If DTC P0442 - Evaporative Emission (EVAP) System Small Leak Detected is stored, proceed to diagnosis DTC P0442 in SI.
• If DTC P0455 - Evaporative Emission (EVAP) System Large Leak Detected is stored, proceed to diagnosis DTC P0455 in SI.
• If diagnostics lead to repair other components not related to the fuel tank filler pipe neck or fuel cap, repair accordingly and disregard this bulletin.
If the diagnostics lead to a leak at the fuel tank filler pipe neck or the fuel cap area, inspect for the following conditions:
• Inspect the condition of the fuel cap by looking for small cracks or any damaged components.
• Inspect the fuel cap seal for distortion or cuts.
• Inspect the fuel filler neck sealing surface for gouges or dents produced accidentally by a fuel nozzle.
Les....do you happen to have a copy of this letter that you could scan & send to an email address (or perhaps as an attachment to a PM)? My '05 has just started to display the same "Check Gas Cap" message & I was about to order an OEM ACDelco from Rock Auto, but if I can get one free from GM, that's even better. Thanks....Dave
08-02-2014, 01:28 PM
#12
Retired & lovin' it!