Question about 2005 Dodge Neon

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Engine light is on

Today i noticed that my engine light is on so i took it to get tested,its a leak of some sort,the code is p0456

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Wen ever i go through puddles in my neon the engin light will go on i have to take the ground off of the battery n sumtimes that wont even work if its been on for over 100 miles n u try alot check the computer

Posted on Sep 29, 2008

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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

1 Answer

Check engine code p0456 2011 dodge nitro


The next step is to get a smoke check which usually tells you where the leak is. Good luck!

Feb 24, 2013 | 2011 Dodge Nitro

1 Answer

Evap code p0456


P0456 - Evaporative Emissions System - Small leak detected
The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the fuel tank pressure (FTP) sensor. When the sensor indicates a small leak in the EVAP system, this code is set.
Potential Symptoms

There will likely be no noticeable symptoms other than the Malfunction Indicator Lamp (MIL). This is because the EVAP system is a closed system and only controls fuel tank vapors, not engine management.

Causes: Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause:
* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking

Possible Solutions: First, using a scan tool activate the vent solenoid, sealing the system. Then monitor the fuel tank pressure (FTP) sensor. If the system is sealing properly, the number will stay consistent. If is isn't, the pressure sensor will show that as well. If the system slowly leaks, use a smoke machine and watch for smoke exiting the system at any EVAP component. Any where there is smoke exiting the system, that is the faulty component. Do not pressurize the EVAP system with air pressure. Doing so can damage the purge and vent solenoids in the system.


Hope this helps.

Mar 24, 2011 | 2007 Mitsubishi Endeavor

3 Answers

P0456 error code on a 2003 Mits. Galant


P0456 = "Evaporative emission (EVAP) control system leak detected (very small leak)."

Feb 25, 2011 | Mitsubishi Galant Cars & Trucks

1 Answer

Trouble code P0456


Hello! Code indicates a leak in the evaporator system (gas vapor management)...Not a part of engine management so there is no noticeable effect, Just the setting of the light...

It is caused, for the most part, by a loose or defective gas cap...If you filled the tank with the engine running it will set the light...

Other causes are; A small leak in any vapor system lines, a leaking purge valve or canister...

Go with the gas cap; It's the #1 choice and the least expense...


Guru............saailer

Jan 13, 2010 | 1999 Dodge Durango

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What is an error for P0456. Found this code when i took an emmissions test today, and failed. what will i need to do/fix to get it reset and to pass?


This is an evaporative emmisions - small leak detected. Sometimes caused by fueling with the engine running (the fuel cap has to seal the fuel tank for the pressure sensor to read correctly), but can be a leak at the evaporative canister, Check valve on top of the fuel tank cracked and a host of other components, fittings or leak points. Best bet is to have a diagnostic done by a shop which should include pressurizing lines, etc.

Jan 06, 2010 | 2002 Mitsubishi Galant

2 Answers

2005 Dodge Grand Caravan codes P0456 and P0303. Engine light on. Changed Gas cap. Need to pass inspection. Please help with diagnosis.


p0456--emission control system leak(verysmall) leak, check all hoses to emission controls, cylinder 3 missfire detected. could be plugs, wires, or coil.this is code p0303,

Jun 04, 2009 | 2005 Dodge Grand Caravan

1 Answer

Code P0456 on 2003 Town & Country


Below are the possible causes for your engine light and error code:

Possible Causes:
  • EVAP fuel tank or canister vapor hoses leaking or damaged
  • EVAP system component leaking, fuel cap loose or missing
  • Leak detection pump damaged or leaking

The fuel cap is probably the most common cause of this problem. It's considered part of the emission system and if faulty or not place on the filler tube correctly, it will throw an error. Best of luck with your engine light issue. Take care!
Greg

May 18, 2009 | 2002 Chrysler Town & Country

3 Answers

Leak in evap system, where and what is an evap system. 2001 mitsubishi Galant


I have the same failure that occurred when smogging my Ford Ranger. The EVAP test was just added a couple of years ago and it tests for leaks in the gas tank vapor recovery system. What this is a system of vapor recovery lines that connect from the gas tank and goes to a canister then returns to the intake and on the next engine start and gets used, instead of leaking into the air.

The only issue is these lines can develop a leak at any of the connection points or along the rubber portions and can be a pain to replace depending on your application. So until you fix the leak you will fail this test since they pressurize the system and if there is a leak it won't hold the pressure.

May 05, 2009 | Mitsubishi Galant Cars & Trucks

5 Answers

Diagnostic code P0456 for 2003 Dodge Ram 1500 5.7


P0456 = EVAP Emissions Control System Leak Very Small

Is the gas cap on tight or is the seal damaged? If it needs replacement, get it from the dealer.

Aug 22, 2008 | 2004 Dodge Ram 1500

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