Check Engine Code P0456?

SHELBYP

MEMBER
2013 JEEP GRAND CHEROKEE
V6
2WD
AUTOMATIC
87,000 MILES

Check engine light came on, code given was p0456. The gas cap seemed a little loose I replaced it. How long does it take for the light to go off if that was the problem?

Tuesday, July 4th, 2023 AT 12:32 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,254 POSTS

Hi,

It should go off after a few miles. Is the light still on?

Since this is considered a small leak, what I suggest is to have the EVAP system smoke tested. A small leak is extremely difficult to find just by visual inspection. When smoke tested, smoke is injected into the EVAP system at a very low pressure. If there is a leak, the smoke will come out at that point.

Let me know if you have questions or if I can help in any way.

Take care,

Joe