Check Engine Light Gas Cap Code

Almost every car owner that has ever filled up a gas tank has encountered a check engine light that comes on when the gas cap has not been closed properly.

Check engine light gas cap code.

An illuminated check engine light. If you find that the light keeps coming on and goes off again once you tighten the gas cap then your gas cap is too loose. If the car has run for a considerably long time say 50 000 miles with the same gas cap it s safe to say that the reason is your gas cap is old weary and exhausted. An illuminated check engine light is another symptom of a potential issue with the vehicle s gas cap.

You can either tighten the cap and wait for the system to reset itself when it determines the problem is fixed or you can use an obd ii code scanner to manually reset the system. A loose or. An improperly sealing fuel cap may cause an evap system leak which will set off. I put together a video discussing a problem my neighbor had with nissan maxima four door sedan after they filled the fuel tank.

A leak at any part of the evap system including the gas cap can set a diagnostic trouble code. If your gas cap is not properly attached you may see a check engine light or a loose cap warning light on the dash. However if the light comes on right after filling up it. Code p0457 indicates the pcm has detected an evap leak most likely caused by the gas cap.

Check engine light comes on. The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap. This warning light can indicate a wide range of problems some minor and others much more serious. The gas cap code is a common diagnostic trouble code that might turn your check engine light on.

Common causes for p0457. Pay attention to the dashboard after the check engine light experience. 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.