Code P0456 = Evaporative Emissions System - Small leak detected - Page 3 - Jeep Commander Forums: Jeep Commander Forum
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post #21 of 30 (permalink) Old 09-04-2019, 12:38 AM
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My gasket stayed on the canister. I took it off, cleaned it, put it back on the canister, and then put the new ESIM on.

I'm too drunk right now to remember if the Oring is keyed or not, but just pay attention.
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post #22 of 30 (permalink) Old 09-04-2019, 06:40 AM
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Thanks @Aerogt01 I'll definitely pay extra attention to how everything is installed as I'm disconnecting the leak detection pump.


Is there a need to put anything on the gasket prior to putting it on?? Kinda like putting some oil on the oil filter gasket prior to installing it.
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post #23 of 30 (permalink) Old 09-04-2019, 10:54 AM
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Originally Posted by Aerogt01 View Post
My gasket stayed on the canister. I took it off, cleaned it, put it back on the canister, and then put the new ESIM on.

I'm too drunk right now to remember if the Oring is keyed or not, but just pay attention.
I laughed out loud when I read this.....


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post #24 of 30 (permalink) Old 09-06-2019, 06:43 PM
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Today I finally had time to get the Leak Detection Pump and gasket swapped out. The old gasket did stay on the charcoal canister. I removed it and put the new gasket on the canister and then attached the new pump. Nice and simple!!

I didn't have the computer to reset the check engine light, so I removed the battery cable for 20 minutes or so. Reconnected everything and then drove it around the block.

Hopefully this is the fix for my P0456 code!!
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post #25 of 30 (permalink) Old 09-14-2019, 06:32 PM
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My check engine light came back on yesterday, exactly a week after changing the Leak Detection Pump and gasket. I checked and verified that it's the P0456 code again.


So I've changed the gas cap, the Vapor Canister Purge Valve and now the Leak Detection Pump. Any suggestions as far as what to look at changing out next for this code??
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post #26 of 30 (permalink) Old 09-14-2019, 07:24 PM
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Originally Posted by dar124 View Post
My check engine light came back on yesterday, exactly a week after changing the Leak Detection Pump and gasket. I checked and verified that it's the P0456 code again.


So I've changed the gas cap, the Vapor Canister Purge Valve and now the Leak Detection Pump. Any suggestions as far as what to look at changing out next for this code??
@dar124;


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.


https://www.obd-codes.com/p0456


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Last edited by Big Blue; 09-14-2019 at 07:30 PM.
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post #27 of 30 (permalink) Old Yesterday, 02:09 PM
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Quote:
Originally Posted by Big Blue View Post
@dar124;


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.


https://www.obd-codes.com/p0456



Ok, I was trying to replace some of the "easier" or cheaper items hoping to fix this myself. But it may be time to have this taken in somewhere to have a smoke test done on it as it seems like it might be one of the EVAP hoses leaking. When I was changing the Leak Detection Pump and gasket I looked at some of the hoses under there and none had any obvious holes or tears. Not sure how easy those lines would be for me to replace anyway.
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post #28 of 30 (permalink) Old Yesterday, 04:14 PM
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Originally Posted by dar124 View Post
Ok, I was trying to replace some of the "easier" or cheaper items hoping to fix this myself. But it may be time to have this taken in somewhere to have a smoke test done on it as it seems like it might be one of the EVAP hoses leaking. When I was changing the Leak Detection Pump and gasket I looked at some of the hoses under there and none had any obvious holes or tears. Not sure how easy those lines would be for me to replace anyway.
If you want to solve the problem, I'd surmise that a smoke test, at a reputable shop, is probably you're best bet at this point.


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post #29 of 30 (permalink) Old Yesterday, 04:41 PM
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Quote:
Originally Posted by Big Blue View Post
If you want to solve the problem, I'd surmise that a smoke test, at a reputable shop, is probably you're best bet at this point.

Yep, I agree with taking it into a shop at this point.. And in my attempts to fix this myself, at least I know that a couple of the other emission components have been replaced!!
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post #30 of 30 (permalink) Old Yesterday, 04:53 PM
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Yep, I agree with taking it into a shop at this point.. And in my attempts to fix this myself, at least I know that a couple of the other emission components have been replaced!!
Absolutely @dar124 and there is nothing wrong with that.


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