P0451 Trouble Code - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 7 (permalink) Old 06-05-2013, 09:44 AM Thread Starter
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P0451 Trouble Code

Last week this code came up on my truck and I had it cleared.It took about a week and it came back.Has anyone else had this on their truck?I live 3hrs from the dealer and don't want to drive there if it may be an easy fix.Any ideas?My truck is a 2010 with a 5.4 and 73k on it.

P0451 - Evaporative Emission Control System Pressure Sensor Range/Performance

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post #2 of 7 (permalink) Old 06-05-2013, 03:05 PM
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Could be the fuel tank pressure sensor which is part of the fuel lines, or wiring to it. Could be Canister related (Solenoid, valve)

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post #3 of 7 (permalink) Old 06-05-2013, 09:40 PM
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Found this

Possible causes
- Faulty Evaporative Emission System (EVAP) Pressure Sensor
- Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
- Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)

When is the code detected?
An improper voltage signal from EVAP control system pressure sensor is sent to Engine Control Module (ECM).

P0451 FORD Description
The Evaporative Emission System (EVAP) control system pressure sensor detects pressure in the purge line. The sensor output voltage to the Engine Control Module (ECM) increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.

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post #4 of 7 (permalink) Old 06-16-2013, 06:46 PM
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Ever get this repaired? had the same code and dealer fixed something under the hood.
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post #5 of 7 (permalink) Old 06-18-2013, 10:35 PM
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yes, you can have a biased (hooped) evap pressure sensor. but before you condemn a sensor you need to make sure it's reading things incorrectly.

the purge valve (under hood, and not to be confused with the vent valve @ the canister) is normally closed. i have done many a ford purge valve for sticking open. the valve (solenoid) will work electrically, but mechanically is fails to function.

easy test: disconnect both lines on the purge valve - one goes to the canister and the other goes to the fresh air intake. blow into the purge valve from the canister side - your breath had better not come out the 'outlet' side.

another common complaint from this failure is a hard start/long crank after fueling.

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post #6 of 7 (permalink) Old 08-02-2013, 09:50 AM
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I had this code show up last winter. If my memory serves me correctly, it was a corroded wiring harness at EVAP pressure sensor. Replaced under warranty.
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post #7 of 7 (permalink) Old 07-20-2014, 07:32 PM Thread Starter
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The dealership checked it out and it was a pressure sensor in the fuel tank.It involved dropping the tank and the sensor was over 200 bucks.Also there was a 2hr diagnostic charge.

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