Trouble Code PO455

cajunwoodrick · 07-05-2007, 02:14 PM

I have a 2003 gmc Serria 4.3L engine I have trouble code PO455 I put my code reader on and it says Evaporative Emission System Leak detected (gross leak/no flow) Can somebody out there tell me what to fix are what parts to change have no clue what this is thanks for any help.

Ford4x4Chik27 · 07-05-2007, 02:57 PM

Yeah from what I've got, there's a leak in the Evap system... and there's about 12 pages of diagnostics on it

cajunwoodrick · 07-05-2007, 04:24 PM

Thanks does this mean I should get a manual are keep searching thanks for the reply

Ford4x4Chik27 · 07-05-2007, 04:40 PM

I'd recommend taking it to a shop, unless you're very secure in your mechanical abilities... Messing with the emission system is no joke.

cajunwoodrick · 07-05-2007, 04:44 PM

Thanks very much for the info

Ford4x4Chik27 · 07-05-2007, 04:45 PM

I wasn't trying to be condescending... Just being straight with you that's all

cajunwoodrick · 07-05-2007, 05:03 PM

No I did not think so you was just trying to help but I did more research on the net and one guy said he brought it to the shop with the same trouble code and they found his gas cap was not screwed in so I just walk out and check mine it was not screwed in also I guess I forgot I will see if it comes up again thanks for your time and help

Ford4x4Chik27 · 07-05-2007, 05:06 PM

LOL I'm glad it was that simple! I didn't read through the 12 pages I found on the issue to see if that could have been an issue! Glad you got it resolved

cajunwoodrick · 07-05-2007, 05:10 PM

Thanks again I read another po455 same problem the person had no gas cap will see soon enough thanks again for your help

scottie · 07-05-2007, 07:47 PM

keep it simple... start with the gas cap

07-05-2007, 02:14 PM	#1
cajunwoodrick Full Member Join Date: Apr 2007 Location: Lafayette La. Posts: 18	Trouble Code PO455 I have a 2003 gmc Serria 4.3L engine I have trouble code PO455 I put my code reader on and it says Evaporative Emission System Leak detected (gross leak/no flow) Can somebody out there tell me what to fix are what parts to change have no clue what this is thanks for any help.

07-05-2007, 02:57 PM	#2
Ford4x4Chik27 Senior Member Join Date: Sep 2004 Location: Sac-Town, Cali Posts: 1,585	Yeah from what I've got, there's a leak in the Evap system... and there's about 12 pages of diagnostics on it __________________ '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's '01 Pathfinder, making a huge effort to keep it stock, since it's my DD

07-05-2007, 04:24 PM	#3
cajunwoodrick Full Member Join Date: Apr 2007 Location: Lafayette La. Posts: 18	Po455 Thanks does this mean I should get a manual are keep searching thanks for the reply

07-05-2007, 04:40 PM	#4
Ford4x4Chik27 Senior Member Join Date: Sep 2004 Location: Sac-Town, Cali Posts: 1,585	I'd recommend taking it to a shop, unless you're very secure in your mechanical abilities... Messing with the emission system is no joke. __________________ '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's '01 Pathfinder, making a huge effort to keep it stock, since it's my DD

07-05-2007, 04:44 PM	#5
cajunwoodrick Full Member Join Date: Apr 2007 Location: Lafayette La. Posts: 18	po455 Thanks very much for the info

07-05-2007, 04:45 PM	#6
Ford4x4Chik27 Senior Member Join Date: Sep 2004 Location: Sac-Town, Cali Posts: 1,585	I wasn't trying to be condescending... Just being straight with you that's all __________________ '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's '01 Pathfinder, making a huge effort to keep it stock, since it's my DD

07-05-2007, 05:03 PM	#7
cajunwoodrick Full Member Join Date: Apr 2007 Location: Lafayette La. Posts: 18	Po455 No I did not think so you was just trying to help but I did more research on the net and one guy said he brought it to the shop with the same trouble code and they found his gas cap was not screwed in so I just walk out and check mine it was not screwed in also I guess I forgot I will see if it comes up again thanks for your time and help

07-05-2007, 05:06 PM	#8
Ford4x4Chik27 Senior Member Join Date: Sep 2004 Location: Sac-Town, Cali Posts: 1,585	LOL I'm glad it was that simple! I didn't read through the 12 pages I found on the issue to see if that could have been an issue! Glad you got it resolved __________________ '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's '01 Pathfinder, making a huge effort to keep it stock, since it's my DD

07-05-2007, 05:10 PM	#9
cajunwoodrick Full Member Join Date: Apr 2007 Location: Lafayette La. Posts: 18	po455 Thanks again I read another po455 same problem the person had no gas cap will see soon enough thanks again for your help

07-05-2007, 07:47 PM	#10
scottie Senior Member Join Date: Jan 2006 Location: South Florida (Palm Beach), originally from south of BOSTON Posts: 644	keep it simple... start with the gas cap __________________ im a straight shooter with upper management written all over me

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