What does it mean when your car has a loose gas cap?
Many cars will also generate a warning signal if the on-board computer detects any fuel vapor escaping from the gas tank. These codes typically will be in the “P0400” series and could indicate something more serious than a loose gas cap, such as a broken seal or even a leak in the gas tank, which is a much more serous problem.
Can a bad gas cap cause a check engine light?
The gas cap is a part of the vehicle’s evaporative emissions system and can cause problems with the system if it has an issue. An improperly sealing fuel cap may cause an evap system leak, which will set off the Check Engine Light when the the computer detects the leak.
What happens if the fuel cap is not affixed?
If the fuel cap is not affixed to the fuel tank properly, or is damaged, this may cause problems with the efficiency of the engine, problems with the evaporative emissions (EVAP) system, a decrease of gas mileage, and/or fuel leaks. A fuel cap creates vacuum pressure seal.
What does the gas cap warning light mean?
If the light doesn’t turn off, inspect the gas cap for any damage and replace it if necessary. A leak present somewhere else in the system can also trick the computer into thinking the gas cap is leaking.
Why does the gas cap light come on but not the Check Engine light?
If there is any abnormal wear or damage to it, even a new gas cap may not seal properly. It can also be possible that there is an EVAP system leak or fault even though the check engine light is not on or an EVAP system leak fault present.
What does it mean if your gas cap is loose?
This system monitors a number of engine and emissions-related components to ensure that everything is in working order. If your gas cap is not properly attached, you may see a “Check Engine” light or a “Loose Cap” warning light on the dash.
What does the Gas CAP Code mean on a car?
The gas cap code is a common diagnostic trouble code that might turn your check engine light on. I put together a video discussing a problem my neighbor had with Nissan Maxima four door sedan after they filled the fuel tank.
Why is the gas cap on my car leaking?
It’s also possible the fuel cap is screwed on properly, but still leaks from either the o-ring gasket seal or the body of the cap itself. Often gas caps are made of several parts even if they look one piece.