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Evap code p0456 - 2007 Mitsubishi Endeavor

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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.

Posted on Mar 24, 2011

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: Jetta 2006 Code P0456

P0456: Evaporative Emission System Leak Detected (small leak)

Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 terminals 1 and 2 for resistance. You should get 22.0 to 30.0 Ohms. If not, replace the canister. If you do, you have other problems.

Posted on Oct 11, 2009

greg_margo
  • 1959 Answers

SOURCE: 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

Posted on May 18, 2009

calilourw1
  • 12 Answers

SOURCE: 2003 Jeep Grand Cherokee Laredo - Code P0456 EVAP leak

open hood and ck for broken vacuum hoses going to the purge valve(2 vacuum ports and a wiring connector)
on the drivers side between airbox and firewall
if good remove driver side rear tire and inspect hoses next to the gas tank and 3rd, the canister is in that wheel well also insp for cracked hoses there also, been working for jeep 12 years i charged people about 1 hour to correct this probem.

Posted on Dec 18, 2009

Testimonial: "Thanks!"

  • 1 Answer

SOURCE: Check engine light in my '07 VW passat 2.0t is on.

P2015 - Intake manifold runner position
P2008 - Intake manifold runner control circuit
P0456 - Evaporative Emissions System - Small leak detected

None of these are urgent, just annoying. And common problems with Audi's and VW. P2015 and P2008 were likely due to a software/sensor glitch, and did not necessarily require a replacement throttle flap motor. P0456 could be due to loose gas cap, but also was likely caused by carbon contamination from the evap cannister. I have all 3 codes on my 06 passat, and just live with them. I would estimate around 1000k conservatively to track down and fix from dealership.

Posted on Nov 03, 2010

  • 110 Answers

SOURCE: Engine light shows a code P0456 (small evap leak)

It is likely a leaky hose in the evap system. The chemicals passing through the hose cause it to become brittle, causing cracking. Take a look at this instruction to see if it helps:
http://www.dodgetalk.com/forums/showpost.php?p=1169489&postcount=6
LMK if it helps troubleshoot the problem.

Posted on May 02, 2011

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