Jeep Grand Cherokee Error Code P0456

Emissions System - Small leak detected What does that mean? The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II p0456 jeep liberty Enhanced EVAP systems are in place to keep fuel tank vapors p0456 jeep wrangler jk from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests

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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

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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 p0457 code 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. Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0444 - P0445

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of 61 Thread: P0456 Code, Small Evap Leak FIXED LinkBack LinkBack URL About p0456 ford LinkBacks Thread Tools Show Printable Version Subscribe to this Thread… Search Thread Advanced Search 06-24-2012,12:41 AM #1 10frank9 p0457 jeep JK Freak Join Date Feb 2012 Location So Cal Posts 782 P0456 Code, Small Evap Leak FIXED So for the past few months I've been battling the dang check engine light coming https://www.obd-codes.com/p0456 on even after a reset. Got the 0456 code and found out that it was the emission/ evap system "small leak." Most folks, including my mechanic suggested starting at the gas cap. Big surprise, it came back on after a few hundred miles. I checked all of the evap/vacuum lines (or so I thought) and couldn't find the source. I read somewhere that the http://www.jk-forum.com/forums/stock-jk-tech-12/p0456-code-small-evap-leak-fixed-237480/ battery sometimes corrodes a vacuum line which is right next to it. I checked it and sure as hell, small hole from the battery acid or heat. I did a quick cheap and temporary fix in order to diagnose if that was the source of the code popping. I taped the line up with some electrical tape, and 500 miles later, still no codes popping! Thought I'd share this for anyone else who may be dealing with this frustrating code popping and likes to DIY. I'll be replacing the line soon, and figuring out a way to reroute it or shield it from the battery acid. Once you see where this darn thing is you'll wonder what they were thinking putting it there in the first place. Anyhow, hope this helps someone. Stay dirty my friends. Fortis Fidelis Reverens Reply With Quote 06-24-2012,10:18 AM #2 jkfisher84 JK Super Freak Join Date Jun 2011 Location chicago Posts 1,043 Wow thanks! Mine must have been the gas cap cuz the light stopped coming on but ill take a look at what your talking about just in case! Reply With Quote

Name Remember Me? Password Register Vendors Vendors Display Alphanumerically Display by Location Display by Map Register your Company Help Garage Garage All Garages Browse by Username Browse Recently Added Browse http://www.jeepgarage.org/f162/evap-system-small-leak-p0456-72157.html Recently Modified Browse Most Commented Browse Most Popular Advanced Search Help FAQ Community Calendar Today's Posts Search Community Links Pictures & Albums Members List iTrader Search Forums Show Threads Show Posts Tag Search Advanced Search Find All Thanked Posts Go to Page... Page 1 of 2 1 2 > Thread Tools Display Modes #1 02-25-2014, 11:15 PM 2014_SRT_Steel Member My Jeep: 2014 6.4L SRT8 p0456 jeep WK2 Join Date: Oct 2013 Location: OKC Posts: 18 Thanks: 0 Thanked 3 Times in 2 Posts Rep Power: 1106 "Evap System Small Leak" - P0456 Well, this is the 2nd time the MIL light has come on my 2014 SRT, with a tad under 1,800 miles on it. The dealer "advised" they couldn't find anything wrong ( tank-less gas cap helping eliminate that issue... ) -- jeep grand cherokee They tried to smoke it but "advised" they couldn't find anything so it was just cleared. Well, it's been about 4 weeks and its back! Nothing has changed and I've driven it maybe 200 miles since it was cleared and checked last at the reputable dealer. Anyone have any ideas? Anywhere I can personally look for something?, Needing the great people in this forums help and advice, please. Any new TSB's out for our SRT's firmware,etc.? Sincerely, __________________ #2 03-25-2014, 02:16 PM jssrt New Member Join Date: Nov 2013 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 0 Re: "Evap System Small Leak" - P0456 Well, I hate to admit this is my first post, but it is. I have what appears to be the exact same issue. I have a 2014 GC SRT, and about 1800 miles on it. The MIL came on, P0456 is the error, and the dealership says they see nothing wrong. Cleared, and came back on 2 days later. I'm frustrated, and reading all of the posts to see if anything helps. Sooner or later, someone will have to discover something, but as of right now, I don't see a simple solution