Q: Code P0451

asked by on September 06, 2017

Is it safe to drive with code p0451

My car has 104000 miles.
My car has an automatic transmission.

Check Engine Light is on Inspection $79.99 - $99.99 Get a Quote

P0451 will set if the PCM (powertrain control module) detects an incorrect, erratic, or otherwise improper voltage signal from the evaporative emission control system pressure sensor. The underlying cause is usually due to a defect in, or damage to, the gas tank, a problem with the fuel tank sending unit, a faulty fuel tank pressure sensor, an open or shorted fuel tank pressure sensor circuit, a faulty canister vent valve (uncommon), or a faulty PCM (very rare). Inasmuch as there are usually no discernible or outward symptoms, other than the Check Engine Light illuminating, some vehicle owners assume that a P0451 code is not a serious issue and that it doesn’t need to be resolved until the vehicle is due for an OBD-II emissions test. However, the vehicle malfunction reflected in the code can result in significantly lower fuel efficiency, and it can trigger other problems as well. Thus, it’s important to resolve it before it costs you more time and money later on. To have the issue identified and resolved, the recommended service is a check engine light diagnostic. If you request that service, a certified Mechanic, dispatched by YourMechanic will come right to your location, will get this resolved for you promptly. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $65/hr

What others are asking

Car does not start remotely and Check Engine Light is on

Hi there. Check to see what Engine Light code is stored first to determine what needs to be repaired. There are 21 different codes that are the basic symptoms for a vehicle with not starting and loss of power that...

Car stalling when starting

The first thing to check is to see if the check engine light is on and diagnose any service codes before continuing. If the problem occurs only when the vehicle is first started, then have the fuel pressure checked to...

Transmission died

When a transmission fails, the vehicle will seem as though it is in neutral. Sometimes if you rev the engine high it might move slowly. If this is the case of if the vehicle does not move at all, yes...

the cars steering wheel is jerking to the left

Hello. Two things that could be causing your the issue on the Sorento are a twisted power steering hose or a faulty new component(power steering rack, PS pump). I suggest you check all power steering hoses to make sure they...

I have a 2012 KIA Forte LX. For the past year I have had a problem with the back wheel/s vibrating. What could be the problem?

If you have already had the wheel and tires replaced then you may have a bent spindle causing the wheel to wobble. Have the vehicle four wheel alignment done to see if the suspension is bent and then you will...

A bunch of warning lights just came on following a minor accident

With the vehicle being involved in an accident, there can be damage to wiring and/ or sensors, particularly if the radiator was impacted in even the slightest. Make sure the coolant level is correct. Even with the level correct, there...

My 1999 Mitsubishi Eclipse won't start. Cranks and idles but does not start. I have replaced every electrical and sensors possible

Hi There, This may be related to many different possibilities, some of which may be related to a lack of spark or possibly timing issues and some of which may be related to a fuel delivery problem or a combination...

Car won't start, 2012 Kia Rio

Hi there, thanks for writing in about your 2012 Kia Rio. If you only hear clicking, then you should have the starter checked to see if it is getting power. Replace the starter if there is power when you try...

Manual car turns on fine but cant change gears.

Have the clutch system checked to see if it is releasing the clutch so You can change gears. Look in the clutch master cylinder to see if the fluid is full or if it leaked out. If no fluid in...

Related articles

The Best Used Cars to Buy If You're in a Wheelchair
Being Being in a wheelchair means you have a very specific list of demands, and requests for your vehicle. The main focus is of course how you will get in and out of the vehicle. There are some other aspects...
A Buyer’s Guide to the 2012 Kia Soul
Known Known to a lot of people as “the hamster car” thanks to its funny and catchy TV ad campaign when it first debuted, the 2012 Kia Soul has gained a lot of popularity over the last few years. Some...
A Buyer’s Guide to the 2012 Kia Sorento
While While Kia may still be headquartered in Korea, the 2012 Kia Sorento is made right here in the United States, making it easier for Kia to put a lower price tag on this fully loaded compact SUV. With a...