Chevrolet Malibu Problem Report
Chevrolet Malibu Check Engine Light Due to Gas Cap Issue
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
drivers info center has check gas cap message on it. I checked gas cap it was tight and heard the 3 clicking sounds. I still am getting message of check gas cap on the driver info center,I purchased a new gas cap . I am still getting message and it tripped the check engine light. OBD TESTER, is giving code of P0449. - Visitor
fuel gauge bounces around after 3/4 take ,then my check engine light comes on and stays on.Did go out once but not now - Visitor
Check engine light stays on due to the gas gauge. - Karen Hill
car ran rough after refueling and check engine light came on. took off gas cap and retightened and solved the rough running engine and check engine light went off after a couple of days. happened again and replaced the gas cap and no more problems. - Visitor
Gas cap could not be tightened and check engine light came on and wont'go off. will have to go by dealership now. It's always something. - Visitor
The check engine light came on after replacing the fuel pump they said it was my gas cap. Turned out they didn't reconnect some tube when fuel pump was replaced. I was getting gas fumes inside the car on occasiona also. - tnaolson
Full tank of gas but registers empty and engine light comes on. - Visitor
Replaced the cap and the problem was solved. - aprilmd01
My car just recently started sending a "check gas cap" message long after the gas cap has been opened. It has not been repaired. - Visitor
gas cap vibrates loose and makes check engine light come on. Bought new cap and it still does it. Even with a lock gas cap. - Visitor
After tank is filled, fuel gauge goes to empty and engine light comes on. It does this for a few days and finally clears up. Chevy people say it needs fuel level sensor replaced (1000.00) - Visitor
at times the engine light will turn on, only to find out the gas cap is not properly placed, after gassing up. - aledif96
My check engine light is on as well, and when I had it checked the mechanic said it was the gas cap. - Visitor
Engine light came on. Checked gas cap and took it off, put it back on. Light went off 2 days later. It came on again this morning. Took the gas cap off and it doesn't stay in now...it kind of ratchets but not really and it just falls right out. Haven't fixed it yet but tomorrow will get a new cap. Definitely the original one is totally worn out. - Visitor
Wencourage bought new gas cap, took it to the dealer and they ran it through test to see why the evap code was continously coming up, but couldn't find anything and determined it was the gas cap. The cap was replaced with a brand new cap and light still on. - cathip
Check engine light would illuminate on occasion. Carried it to shop and was told it was a worn gas cap. Replaced gas cap. Never came on again. - Visitor
Started getting messages to tighten the gas cap. I would check it but it never was loose. After 3-4 weeks the check engine light came on. OBDII said it was a bad gas cap so I replaced it with the first aftermarket cap I could find. Engine light never did go off. Started reading on the internet and found out that the gas cap has to be OEM or it will not work. When I compared my new cap to the original cap, which I had not yet discarded, I saw that they were really different. I took the "new" cap back and got a refund. No OEM cap was available so.....I got some mineral spirits and a microfiber cloth and cleaned the gasket on the original cap. I got a lot, and I mean a lot, of black residue off the gasket. I also cleaned the filler neck where the gasket makes contact. I put the original cap back on the car and within 10 miles the check engine light went off. Voila, problem fixed. I hope this saves y'all a bunch of $$$. And, yes I am from Texas Y'all. - Visitor
Continuous light check engine when all I needed was a new gas cap - Visitor
Fuel gauge bounces from empty to actual level if over 3/4 tank, and check engine light comes on when this happens. Will randomly reset to correct level while driving, but soon reverts back to inconsistent bouncing afterwards. *Fun update - this has been happening at lower levels now! It used to get only happen at 3/4 tank, now it's starting to happen at 1/2 and 1/4 tank as well. LOVE me some Chevy! - Visitor
Engine light came on, I then went to a auto parts store. They checked it via doing a reading and discovered it was the gas cap! - Visitor
Check engine light is on and won't go out
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