Question about 2004 Chevrolet Impala

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P0455 comes back on ,we try to fix it

We done smoke testing.. there was no leak found the sencers are working fine. We replaced the fts 2 days later... code p0455 comes back on again. p0455 2000 dodge intrepid r/t gas cap change still on

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The EVAP control sytem is checked by the ECM upon the first start of the day when the engine is cool and will trigger the DTC code P0445. If you have a vacuum line leak when it's cold and seals it self when it warms up then the code will stay there. After warming up the car reset the ECM to clear any DTC codes and see if any MILL shows up. IF not then there is a leak only when the system is cold so your going to have to try to do a smoke test when the system is cold.
The other thing is to check all the vacuum lines and fittings around the canister and fuel tank for any lose clamps ECT.
Good luck and keep me posted. Be glad to help you 

Posted on Jun 01, 2009

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Posted on Jan 02, 2017

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1998 mercury mountainer code p0455 large leak what is the fix


There is no one fix for this fault, you need a smoke test done to see if there really is a leak or it is a sensor malfunction, that takes a skilled tech to figure out what and which is the cause. This code can be a real nightmare to diagnose..

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I have a 2007 nissan sentra engine light is on with code P0455 I DID a smoke test AND seen smoke coming from above the gas tank how do i fix it?


code p 0455 refers to evaporative emission(EVAP) system--large leak====causes --hose connection/s--intake leak--EVAP canister---EVAP canister purge valve
check for loose/cracked filler hose , loose fitting for fuel sender unit
replace the canister purge valve

Jul 20, 2016 | 2007 Nissan Sentra 2.0 SL Sedan

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Error code p0455


Try reinstalling your gascap. The emissions system has a large leak in it and if the cap is tight then something else is exposed.
There is a machine called a "smoke tester" which injects smoke into the system to reveal the leaks. If any work has recently been done to your car, you could look in that area for rips in the emissions hoses.

May 13, 2013 | 1997 Ford Expedition

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P0544 Code and problems with my Mechanics!


There is no code P0544 , maybe you mean P0455 ?
The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge solenoid valve OPEN and the EVAP canister vent solenoid valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge solenoid valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level, or if the vacuum level decreases too rapidly, this DTC sets.

It's called EVAP purge solenoid , the front one . An your Mechanic is probably not full of it . You need to know how the system works . If the computer set's a code for that system , it will not test it again till it's fixed an sometime other problems come up . After he fixed the first problem he should have told you that after a day or two or a couple of key cycles , starting the car cold till warm an a cold start again , sitting over night , 8 hours . Then the computer will retest the system . An other codes may set . Before putting blame , you should have to read about OBD 2 emissions , before being able to have a vehicle .

Mar 20, 2017 | 2004 Pontiac Grand Prix

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Rough idle and blue smoke


Possible vacuum leak and or internal engine issue, have a cyl compression check done along with cyl leakage test

Nov 03, 2012 | Cars & Trucks

1 Answer

Ck engine is on Dealer found code P0455


DTC 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
* A non-conforming gas cap (i.e. not factory/original brand)
* Other leak or damaged piece in EVAP system

Possible Solutions: With a p0455, the most common repair is to:
* 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 send us news.

Mar 14, 2011 | 2004 Mitsubishi Endeavor

1 Answer

My 2002 Dodge Grand Caravan Sport recently failed the NC emissions test.The codes it threw were p0442 and p0455.I replaced the gas cap and took it to Advance Auto and this is the codes I got back.Codes...


Chrysler EVAP P0442 P0445 Smoke Diagnostics
P1698 Dodge PCM Fault No CCD Message From TCM
Do you know what a serial data communication network is ?
CCD SCI DATA LINES TECH TIP

Sorry dude but you don't have a prayer of a chance to fix this ! You know anything about automotive electronics , electrical systems ? Have a factory or professional scan tool . Going to advance auto won't cut it .

Apr 27, 2017 | 2002 Dodge Grand Caravan

1 Answer

P0455, i HAVE A SMOKE MACHINE, NO LEAK. NEW GAS CAP. I reset the light and code came back


A code p0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system

Possible Solutions: with a p0455, the most common repair is to:
  • 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

Hope helps.

Sep 14, 2010 | 2005 Chevrolet Equinox

2 Answers

Have a P0455 code on it and would appreciate if some one could tell me possible causes.


There is a bad vacuum leak somewhere in the emmisions evaporative system. Check all the vacuum hoses for cracks and good connections.
If you can't find any, take it and have a smoke test done on it, that will reveal where the leak is.

Dec 31, 2009 | 2001 Ford Explorer

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