Question about 2004 Chevrolet Impala

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My engine is on. the code i get for it says emmision leak (large). i changed the gas cap, what else can it be??

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Since you have an obd2 system,it will trigger a code,in which you can have it diagnosed with a scanner.When you find what the code is,boom,start there.

Posted on Oct 02, 2010

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Any of the many other EVAP parts in that system

You have a large leak code--broken hose,broken or failed check valves,solenoids and on and on

Best to have it smoke tested. Then you can repair yourself,or have it done at the time it gets smoked

Posted on Oct 02, 2010

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2 Answers

Code 0456


You mean check engine light? If so, the P0456 code is an emmisions leak code. You will need to take the vehicle to a qualified repair facility and have them run an emmisions leakage test on it.

Apr 28, 2014 | 2002 Mitsubishi Lancer

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I have a 2001 ford Taurus check engine light and gas cap light on with no codes


It should be on emmision control or it might be vent solenoid stuck or there are air leaks on between gas cap or hoses must be used leak test to determine where are leaks...

Aug 24, 2013 | Ford Taurus Cars & Trucks

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Code po455 2004 chrysler sebring 2.4l sohc G vin code


The code is for a large leak in the fuel tank or evap system.

Some possible cause are - a leaking fuel tank, gas cap, hoses to and from the vapor canister and engine, and a faulty canister.
It's possible a valve is stuck open and allowing the engine to pull fumes in when the system is supposed to be closed, but if this were the case the computer should also set a code for that valve.

Here is the definition.

P0455 CHRYSLER Description The Evaporative emissions (EVAP) system is design to prevent the escape of fuel vapors from the fuel system. Leaks in the system, ca allow vapors to escape into the atmosphere. The leak detection system tests for EVAP system leaks and blockage.


During the self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.
Read more: http://engine-codes.com/p0455_chrysler.html#ixzz24EH3F11s

Aug 21, 2012 | Chrysler Sebring Cars & Trucks

2 Answers

Engine code po455


Check this info about 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


Check it and keep us updated.

Apr 22, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

Hi, I have a scanner cause engine light is on, shows vacuum leak large. tried new gas cap, cleaned filler tube where gas cap contacts, replaced a plastic tube from valve cover to air filter hose. tried to...


what code is it?po440,p0455?If it is one of those codes it means you have a large evap system leak not a vacuum leak by the engine.the evap leak is most likely a inop vent valve or a fuel cap not properly sealing.

Apr 13, 2011 | 2005 Chevrolet Uplander

2 Answers

Service engine Diagnosis Code PO455 Transmission revs up


Hi, the code 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.

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


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

Mar 05, 2011 | 1999 Ford Taurus

2 Answers

P0455


IT SOUNDS LIKE U HAVE MORE THAN ONE PROBLEM. THAT CODE IS USUALLY SET WHEN U HAVE A PROBLEM WITH YOUR GAS CAP OR SOMETHING IN THE EVAPORATIVE GAS PRESSURE VAPOR SYSTEM. MOST COMMON THINGS ARE THE GAS CAP IS LOOSE,AFTERMARKET GAS CAP.

Aug 01, 2010 | 2006 Kia Optima

1 Answer

My 2004 dodge neon had it's check engine light come on the codes that came up are P442 and P456 what do they stand for?


they are for evaperative emmisions leaks.usually its a loose gas cap that causes these codes they are small leak codes.check gas cap, give it a couple of turns more to be sure its tight.
the car has to make 3 consecutive trips that detect no leaks before light will turn off.each trip has to start with a cold engine gas level between 15% to 85% of full.
or clear codes with code reader and drive car as usuall. if a leak is detected twice then the light will come on again.if it does then you will need to look for cracked vapor hoses,leaking canister etc

Mar 30, 2010 | 2004 Dodge Neon

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

1 Answer

P0455 Code


Hello,
P0455 OBD-II Trouble Code Technical Description Evaporative Emission Control System Leak Detected (no purge flow or large leak)
What does that mean? 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
Also check all rubber hoses anywhere on the engine and look for Cracked or /loose fitting hoses.

Hope This Helps!!!
Good Luck
Rich Lilja

Nov 26, 2008 | 2000 Chrysler Grand Voyager

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