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Arench, Master Technician
Category: Chrysler
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Experience:  30-years experience auto and truck repair.
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2003 PT Cruiser, code p0456, small leak detected evap emission system

Resolved Question:

2003 PT Cruiser, code p0456, small leak detected evap emission system
Submitted: 8 years ago.
Category: Chrysler
Expert:  Arench replied 8 years ago.

Greetings from Mikey at Just Answer!


What this means is the car is detecting a leak in the fuel system. Not a leak of liquid fuel, rather a leak in the airspace or gas fumes section of the fuel system.

This type of failure often turns out to be a bad gas cap. Sometimes there can be a rust spot on the fuel tank or filler neck or another leak elsewhere in the fuel vapor system.

My recommendation is to get a new fuel cap and drive the car. If the leak is fixed, the engine light will go off on its own after a few days.

After a new fuel cap, if the light does not go off on its own after a week of driving the car everyday, you will need an emissions mechanic or smog shop to pressure test the fuel vapor system with a smoke machine to find the leak. Often the smoke machine reveals a split rubber hose somewhere in the evap system or a rusted out fuel filler neck.



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