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  #1  
Old 02-02-2005, 10:39 AM
mkotalik mkotalik is offline
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Question code p0455

I own a 98 f-150 5.4 with 70,000 miles.

I get a check engine light (code p0455-large leak detected in evaporative emission control system).

replaced the gas cap with an after market 'stant' ( I believe was the manufacturer) brand. The check engine light went away for 4 days then came on again.

no obvious vacuum line leaks.

puzzled. any suggestions?
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Old 02-02-2005, 12:12 PM
cantrma cantrma is offline
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Gas cap if you're lucky. But from the Motocraft site:

(Phase 0 - initial vacuum pulldown):
First, the Canister Vent Solenoid is closed to seal the entire evap system, then the VMV or EVMV is opened to pull a 8" H2O vacuum. If the initial vacuum could not be achieved, a large system leak is indicated (P0455). This could be caused by a fuel cap that was not installed properly, a large hole, an overfilled fuel tank, disconnected/kinked vapor lines, a Canister Vent Solenoid that is stuck open, a VMV that is stuck closed, or a disconnected/blocked vapor line between the VMV and the FTPT If the initial vacuum could not be achieved after a refueling event, a gross leak, fuel cap off (P0457) is indicated and the recorded minimum fuel tank pressure during pulldown is stored in KAM. A “Check Fuel Cap” light may also be illuminated.

If the initial vacuum is excessive, a vacuum malfunction is indicated (P1450). This could be caused by kinked vapor lines or a stuck open VMV. If a P0455, P0457, or P1450 code is generated, the evap test does not continue with subsequent phases of the small leak check, phases 1-4. Note: Not all vehicles will have the P0457 test or the Check Fuel Cap light implemented. These vehicles will continue to generate only a P0455. After the customer properly secures the fuel cap, the P0457, Check Fuel Cap and/or MIL will be cleared as soon as normal purging vacuum exceeds the P0457 vacuum level stored in KAM.

And:

Note that a stuck closed VMV generates a P0455, a leaking or stuck open VMV generates a P1450.

And:

The Canister Vent Solenoid output circuit is checked for opens and shorts (P1451 or P0446), a stuck closed CVS generates a P1450, a leaking or stuck open CVS generates a P0455.
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Old 02-02-2005, 12:44 PM
mkotalik mkotalik is offline
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wow
thank you sir
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Old 02-02-2005, 09:10 PM
cantrma cantrma is offline
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You're welcome, I can cut and paste with the best of them.
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Old 02-02-2005, 10:44 PM
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Racerguy Racerguy is offline
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Hi Mike and welcome to the forum

Quite often a P0455 is caused by a bad canister vent solenoid or broken wiring to it. If you look above the rear axle you'll see the canister vent solenoid. It is a cylinder shaped piece about umm 1.5" in diameter and 3" long or so. It has 1 electrical connector on it. Check the wiring to make sure it isn't broken or corroded at the connector.
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Old 02-03-2005, 09:06 AM
mkotalik mkotalik is offline
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Thanx again.
This site is great, very informative.
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Old 09-06-2006, 06:19 AM
metrovic metrovic is offline
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WHat's a VMV?
the purge valve under the hood?
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Old 07-01-2013, 07:41 AM
DJayP8439 DJayP8439 is offline
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Exclamation Any updates on this issue/topic?

Quote:
Originally Posted by Racerguy View Post
Hi Mike and welcome to the forum

Quite often a P0455 is caused by a bad canister vent solenoid or broken wiring to it. If you look above the rear axle you'll see the canister vent solenoid. It is a cylinder shaped piece about umm 1.5" in diameter and 3" long or so. It has 1 electrical connector on it. Check the wiring to make sure it isn't broken or corroded at the connector.

I have a 2003 F150 5.4L 4x4. I'm throwing the same P0455/P0457 codes. Replaced the gas cap(OEM). cleared lights then they came on 4-6 days later. I have inspected all hoses visually.

Just wanted to bump this to see if anyone ever figured out what the cause of their problem was. This seems to be a popular issue with this make of 150's. On my canister above the spare tire i can see what i believe is a hose intake but no hoses in sight. Is this supposed to be wide open for the fresh air???
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Old 07-01-2013, 07:41 AM
 
 
 
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150, 1997, 1999, 401, 54, 97, code, codes, engine, f150, ford, p0455, po455, solenoid, vent, vmv

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