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04 Pontiac suv code p0455 mea6n an how to fix it the cheapest way

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Usually that's a large leak in the Evaporative Emission System. That's the system that prevents the escape of fuel vapors from the fuel system.

You can get this from a loose gas cap, a non-oem gas cap that doesn't fit right, or from a major leak in the EE system somewhere.

So start off by removing and re-installing the gas cap and then drive for a day and see if the codes come back. If that doesn't work, see if you can swap the gas cap with one that you know is good and then try that for a day. If that doesn't work someone will need to go through the tubing of the EES looking for something damaged, loose, or pulled off.

Good luck.

Posted on Apr 08, 2015

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Posted on Jan 02, 2017

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Pontiac montana 2006 p0455 how to fix?


check your gas cap to be certain it's tight. Are you smelling any gas which would mean that vapors are leaking causing the computer to throw the code. It's in you evap system. Check your hoses also.

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P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms: You likely won't notice any drivability problems.

Causes: A code p0455 most likely means one or more of the following has happened:
* A loose or improperly affixed gas cap
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* Other leak or damaged piece in EVAP system

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* Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
* Otherwise, replace the gas cap, and/or
* Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

Test it and tell us news.

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A P0455 is a Evap system (large) leak. Sometimes this code is set by a missing or bad fuel filler cap.

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