Emission
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Registered User
Joined: Sep 2010
Posts: 5
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From: new hampshire
Emission
Had code p0456.....repaired 2 cracked lines at the Vapor canister. also replaced solenoid purge, after 120 mile engine lite comes back on, did a fog test all was good. rest computer engine lite came back on. have a 2003 4.7 sxt. thanx for any input....
Thread Starter
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Registered User
Joined: Sep 2010
Posts: 5
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From: new hampshire
I have replaced all the lines at the canister and the canister purge sensor and lines there as well. new gas cap, still getting PO456 code, one step further did a fog test with no leaks.......
THE ULTI-MOD
Joined: Jan 2007
Posts: 19,797
Likes: 36
From: Union NJ
did you try resetting the pcm?
To reset your engine codes:
Remove the negative terminal of your battery (10mm wrench).
Turn your ignition key to START and hold it there for about 15 seconds.
Turn your ignition key to OFF and remove it.
Connect the negative terminal of your battery.
Start but do not hit the throttle. Idle for about 10/15 seconds then turn off.
Restart the truck and drive as usual. It will take at least 12 starts and 48 miles to fully retune the computer. Hard Codes leave a shaddow for 40 full cold starts.
Remove the negative terminal of your battery (10mm wrench).
Turn your ignition key to START and hold it there for about 15 seconds.
Turn your ignition key to OFF and remove it.
Connect the negative terminal of your battery.
Start but do not hit the throttle. Idle for about 10/15 seconds then turn off.
Restart the truck and drive as usual. It will take at least 12 starts and 48 miles to fully retune the computer. Hard Codes leave a shaddow for 40 full cold starts.
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Registered User
Joined: Sep 2010
Posts: 5
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From: new hampshire
i did when the code first came up about 2 months ago.....and did it again 3 weeks ago and 300 miles later lite came back on did a obdII test again same code PO456......thanx for your help
