Question about 2006 Pontiac G6

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On a G6, check engine light is on as a result of the message "tighten gas cap" which causes the remote start not to work

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Need to replace gas CAp pressure leak

Posted on Nov 19, 2009

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Hi:
The gas cap fault is very common on this line of GM cars, and if you check your gas cap and have tightened till it is clicking, If you clear the code and it comes back, you need a new gas cap.

Most auto parts stores will read and clear your codes for free, so ask around.

Posted on Nov 19, 2009

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Gas cap indicaytor light came on. Changed cap and made sure it was tight but indicator light still comes on


The gas cap light is a generic light that indicates an emission problem. Usually a vacuum/pressure leak within the system. The gas cap is usually the first thing to check, however may not be the problem. There are numerous sensors and lines that control the vacuum/pressure/ of the fuel vapors and one of these is loose/disconnected/defective causing this light to come on. I would recommend inspecting hoses under the hood for any that may be loose/disconnected. You may also require a scan test to view sensor data to isolate the source of the light

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What kind of locking gas cap should I get for my Pontiac G6 so that it doesn't make the check engine light come on?


anytime you use an aftermarket gas cap there is the possibility of it causing the check engine light to come on typically with an evap code.

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Tighten gas cap message and then check engine light on 2008 suzuki xl7


there is a DTC error stored, in the ECU. (scan tools show this)
there is a car puter, error, message that really means
the gas tank is not holding air pressure.."EVAP sys"
and 99% of the time, that is "a loose gas cap"
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or 1second with any scan tool, even a $30 tool.

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Hi have a pontiac G6 GT 2005 I have a message that comes on saying check gas cap the 1st time it happened it was under warranty and the dealership replaced the gas cap for me, a year later the same thing...


The fuel cap needs to be tight or it will set a code. It's a pressurized fuel system. Try to tighten snug the code should clear itself. If this does'nt work exchage the fuel cap, it may not be working properly.

Jul 25, 2011 | Pontiac G6 Cars & Trucks

1 Answer

The check gas cap light has gone on numerous times over the last few weeks. I bought a new gas cap at Autozone. It seemed fine and the light went on again and off again. The engine light is on. What...


if the gas cap is installed properly(tightened),then you could have a code in the computer for the evap system that should be checked into.you will have to know what the code is to find what area of the system that needs to be checked out.

Jul 05, 2011 | 2006 Pontiac G6

1 Answer

At first my gas cap light came on -- I tightened it several times-- now, the engine light is on-- I had someone at Advance Auto check and he said it was an emissions problem-- Can you help me with this?


The code needs to be reset. The code you got was most likely "emission leak medium" this happens if the gas cap is left loose. If the code is reset, and you tightened your gas cap it should not come back. If it does, then get back with me and I can walk you through some steps and parts that will have to be checked, but I am 99% sure its only your gas cap, Happens to me all the time, and I just reset it after tightening my cap. Thanks.

Mar 15, 2011 | 2006 Pontiac G6

1 Answer

Got numerous "tighten gas cap" messages. finally


computer is seeing a large evap leak. most common cause is gas cap left loose this is why it is throwing up that message. since you have already done that we know there is a leak somewhere else. look underr vehicle and should see a black rectangular box close to gas tank this is the evap canister check the lines hooked to this and just do a visual inspection of hoses see if one has come off. may need to have it checked out we have a machine that hooks into system and pressurizes with "smoke" the smoke leaks out of the problem area and helps diagnose .

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On a 2006 chevy impala it tells you to tighten the gas cap ,then when you do, we shut the car off. Then check engine light comes on. Where is the sensor located.


There is no sensor for a loose gas cap. What is happening is that the evaporative emission system is sensing a "Large Leak". Usually code p0455. The computer sees this as the most probable cause is a loose gas cap depending on several factors it looks at. You would need to clear the code(s) and see if that was the problem. If the light comes back on, then you have a problem in the system that will not let it seal. Possible solenoid problem, leaking hose / line, etc.

Mar 28, 2009 | 2006 Chevrolet Impala

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