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General Smog Check

Dodge Ram - Trouble Codes P0442 evaporated emission system leak. P0455 evaporated emmission system leak detected.

I want to fix this myself and not pay hundreds of dollars. I have a 2002 dodge ram 1500. Went to the shop and they're charging $89 for diagnosis and told me it can cost from 300 to 1000. I don't have that kind of money.


Possible faults which could have caused your Dodge to trigger trouble codes

P0442 and P0455 have to do with the EVAP system. A smog repair station will

need to trace the EVAP leak and determine where the leak is at. Maybe

something as simple as a new clamp or hose (part of the EVAP system) is all

that's needed, or the problem may be more severe requiring the EVAP canister

or purge solenoid be replaced. The first step is to find out where the leak

is at. Note also, EVAP trouble codes have been known to set with faults as

simple as a loose gas cap. If your Dodge truck's check engine light recently

illuminated, you may want to insure the gas cap is tight and drive your

Dodge for a week or two. If the EVAP code was triggered due to a loose gas

cap, the light will turn off once the computer system realizes no real EVAP

fault/s exist. If tightening the gas cap does not turn off the check engine

light after two weeks, then certainly there is a defect somewhere within the

EVAP system, and a hands on diagnosis will be required.


Although EVAP systems vary they all contain one similar component. This

component is the Charcoal Canister. The canister is responsible for storing

gasoline vapors from the vehicle's fuel tank/s and carburetor float bowl (if

applicable) until the engine is ready to burn them through the combustion



The charcoal canister is usually located in one of the far corners of the

engine compartment. It is normally a black container filled with charcoal

pellets that absorb fuel vapors. Not all charcoal canisters however are

located in the engine compartment. Some vehicles manufactures have mounted

their canisters closer to the vehicle's gas tanks in-order to maximize space



The number one fault which causes vehicle's to fail the EVAP test is broken,

loose or disconnected EVAP fuel lines. It is necessary to trace the entire

EVAP system in order to find the defective section and/or component.

posted by SmogTips Support 12-13-2010 09:12 AM

posted by SmogTips Support 12-15-2010 10:54 AM