Gas cap warning light problem

[ard]

Originally Posted by JCL

If it is just a loose gas cap, and it is tightened, it can clear itself. If something else is causing it, obviously that needs to be repaired first.

Reading the codes may indicate what component is causing the problem.

It can be a faulty cap that isn't sealing.
It can be a leak in the evaporative emissions control system
It can be a fault in the air pump that creates pressure in the fuel tank and evaporative emissions control system
It can be a sensor in that system.

It is not caused by your gasoline or driving down from higher altitude.

Get the dealer to look at it and read the codes while you are under warranty. Your emissions system warranty may have a different term than your full vehicle warranty though.

Perfect advice on the possible causes, and what it is NOT.

Recognize that if the code "clears itself" it will just turn off the light, but the code remains stored until the memory is reset.

Do not allow this to go past 50k miles. It is NOT covered by the emissions warranty as I recall- only a few specified parts are covered by the 7/70 or 8/80 emissions warranty...and dealers will charge you for labor to diagnose too.

[wwu123]

Thanks for the comments. I do have a OBD reader that shows the error code is P0442 Evaporative System Small Leak, which seems to be the one caused by loose gas cap, but also if there's a faulty seal or leak.

I do have the CPO warranty after I pass 50K miles, do you know if these parts and repair might be covered under the CPO warranty (less $50 deductible)?