Question about 2003 Jeep Wrangler

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Runs good engine lt on code p0455

Runs good engine lt on

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  • Lewis Meyer
    Lewis Meyer Apr 22, 2014

    Hi Mark Broussard, I want to help you with your problem, but I need more information from you. Can you please add details in the comment box?

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Possible causes
Missing or loose fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
EVAP canister or fuel tank leaks
EVAP system hose leaking
Fuel tank leaking


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Posted on Jan 12, 2015

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If you have access to a simple vacuum gauge, hook it up to the purge valve (small hole) and disconnect the electrical connector of the purge valve. Start the engine and let it run for a while. If there is any increase in pressure, replace the valve. If there is no change in pressure, then it is another component of the EVAP system. Vent solenoid valve (check next using same procedure), purge solenoid valve (already checked), fuel tank pressure/vacuum sensor and a charcoal cannister. My next guess would be the charcoal cannister. The age of your car is nearly 10 years = 150k miles. Not sure how long the cannisters last, but surely not forever. The fuel tank pressure/vacuum sensor will throw an additional code after P0455. Good luck.

Posted on Apr 22, 2014

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A loose gas cap or bad gas cap can cause this ,or filling gas tank while it running .or it could be a small leak in the evap system

Posted on Apr 22, 2014

  • Johnathan Lence
    Johnathan Lence Apr 22, 2014

    The code will have to be cleared with a hand held ,unhooking battery will not clear this code

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1 Answer

Code p0455 on envoy 2004


large evap leak --check gas cap that it is on --look under truck at rear of fuel tank by spare tire and check the evap canister and hoses the following link will assist you
https://www.obd-codes.com/p0455 How to Fix Check Engine Light P0455 Emissions Purge Valve Replacement How to Fix Check Engine Light P0455 Emissions Purge Valve Replacement

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My 06 cobalt has these codes can anyone tell me what they mean? Are they an expensive fix? p0446,p0455, p0172


code p0446 refers to evaporative emission (EVAP) system-vent control-circuit malfunction===causes --wiring--EVAP canister purge valve--ECM
code p0455 refers to EVAP system-large leak detected===causes --hose connections--intake leak--EVAP canister---EVap canister purge valve
code p0172 refers to system too rich, bank 1===causes intake blocked---EVAP canister purge valve--fuel pressure ---EGR system---injector/s ---ECM
because the EVAP purge valve appears in all codes I would be inclined to change that unit first the run the fault codes again

Jul 23, 2015 | 2006 Chevrolet Chevrolet Cobalt LT

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I have a 2010 Chevy impala. Reduced engine power and check engine light also comes on but won't stay on. Codes are P2138 P2122 P0455


Hi Rosalee_IM,
The codes your vehicle is storing are for low voltage from your accelerator pedal position sensor and a gross evaporative emission leak. The code P2122 and P2138 are directing you to test the accelerator pedal position circuit and/ or sensor. This is the cause of the reduced power concern you are feeling.The P0455 is telling you there is a large leak in the evaporative emission system. The most common cause for this code is a loose or incorrectly installed gas cap.I hope this helps clarify the concerns you are experiencing. If you'd like more information on how to trouble shoot the problems,drop me a line. Please include the model Impala you have,(LS,LT or LTZ) and the engine size. I will do my best to get back to you as soon as possible.Thanks, Chuck

May 03, 2012 | 2010 Chevrolet Impala

1 Answer

I got a '06 Trailblazer, LT series and L6 engine. I got the check engine ON with P0449 and P0455 codes and the MIL On too. I change 2 solenoids (Purge and Vent), clear the codes with mine codes reader...


maybe aftermarket products--------disconnect batt and touch neg and pos cables together-after few minutes reattach and start car-----as long as its runnin fine-cause its just evap emmiss issue

Aug 09, 2011 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

2001 chrysler concorde engine codes


P0455 Evaporative Emission Control System Leak Detected (gross leak) - check your entire engine bay contents for any type of leak, air conditioner when it's running, coolant, things like that.

P1684 Battery Disconnected Within Last 50 Starts - this is a code that will go away over time

Mar 25, 2009 | 2001 Chrysler Concorde

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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