P0456 Code, Erased but not gone... - JeepForum.com

 
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post #1 of 5 Old 08-02-2009, 08:03 PM Thread Starter
01Limited45324
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P0456 Code, Erased but not gone...

My 2001 Grand Cherokee's check engine light came on so I ran a diagnostic and the car returned a P0456 code (small Evap leak).

I checked my gas cap (loose again, might need replaced?) and fixed the probable problem.

I then hooked it up to a handheld Diagnostic and erased the code. However, the light is still illuminated.

My question: If it's not the gas cap, what else could it really be? Does it take a few cycles to get the light to turn off, or does it come off as soon as the problem is fixed?

Yes, I checked wjjeeps.com and did a forum search, but nothing really answered this question specifically.


-Tom

2001 Grand Cherokee Limited
2002 BMW 530i
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post #2 of 5 Old 08-03-2009, 09:31 AM
Double E
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it will take a few cycles to clear as long as

- the code is not triggered again
- another code was also not present at the same time and is still an issue

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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post #3 of 5 Old 08-03-2009, 12:16 PM
greasefingers
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a) the charcoal canister could be cracked
b) the vacuum line(s) are broken, dry-rotted or have slipped off
c) the gas cap rubber O-ring is shot causing a leak.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #4 of 5 Old 08-03-2009, 01:11 PM Thread Starter
01Limited45324
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Here's another twist: If I do the diagnostic cycle (on-off-on-off-on) it still brings up the P0456 code and then it says done after half a second... Normal?

-Tom

2001 Grand Cherokee Limited
2002 BMW 530i
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post #5 of 5 Old 08-03-2009, 01:48 PM
Double E
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Yes......,

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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