Q: Check Engine Light is on with the P0451 code

asked by on

i have  a 2006 f150 with the P0451 engine code for the evaporative emission system pressure switch. when I put fuel in the tank, the nozzle stops like the tank is full but it isnt. would the problem be the fuel tank pressure sensor? if it is would unplugging it let me fill the tank with no problems? what else could it most likely be?

My car has 91000 miles.
My car has an automatic transmission.

Hi there:

Unplugging the fuel tank pressure system would unleash an entirely different set of problems - mainly the truck wouldn’t start. This error code typically indicates that the EVAP vent solenoid is damaged or faulty, which creates excess pressure inside the fuel tank and can cause the problem you’re having. I’d recommend having a certified technician, like one from YourMechanic, complete a further digital scan to determine precisely which of the EVAP sensors or valves is causing this problem then replacing it, reset all error codes, and see if the issue goes away.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Check Engine Light is on with the P0451 code

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car doesn't run correct.

This engine may have one or more problems that can get the drive symptoms you are having. To keep you from having to spend too much money and time replacing parts till the problem is solved then I would suggest...

Q: My car wouldn't start, but when I towed it to a mechanic to look at 2 days later they said it started right up. What could cause this?

These issues are any mechanic's worst problem. With no lasting indicator, including no Check Engine Light, it's impossible to know what happened. All you can do is hope to inspect the car quickly enough that the problem still exists. With...

Q: There is no power and is shaking in overdrive.

The Mass Air Flow sensor (MAF) may be dirty and causing the throttle position sensor to act up. Remove the MAF and clean it with electrical cleaner and then put it back on. Check all the hose clamp connections to...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.