Check Engine Code P0456?

Tiny
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

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 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
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Tuesday, July 4th, 2023 AT 11:02 PM

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