ssturbo305

iTrader: (1)

please help i got a CEL with this code P0451- EVAP Emission Control System

while i was driving on the highway. what does that mean? car seemed to run perfect even with the code. full boost and everything?

i went to the car and cleared the codes?

is this code a major problem? whats your opponion ?
should i have just cleared it and if it comes up again take it to dealer?

thanks

Dart_SI

iTrader: (1)

does youre car start fine after filling up or does it give u a little bit of trouble?

ssturbo305

iTrader: (1)

Never given me any of those problems ^^^

09BlueBaltSS

Its says "evap emission control system pressure sensor range/performance". Possible bad seal on the gas cap. Check it out.

nutty21

iTrader: (1)

Jacking this thread.

I've had the same code. Been throwing parts at it and nothing seems to help.

Fuel Tank Cap - ACDelco GT283




Replaced Valve Assembly - ACDelco 214-1473




Replaced Exhaust Gas Recirculation Valve - ACDelco 214-2230






Could really use some help here.

Thanks,

Jay

nutty21

iTrader: (1)

[ECM] P0451 - Evaporative Emission Control System Pressure Sensor Range/Performanc

nutty21

iTrader: (1)

Would love some input on this.

I'm thinking of replacing the Fuel Tank Pressure Sensor - ACDelco 13502903 next,
but would love to hear from someone on this...

Stamina

There's an evap pressure sensor on the side of the charcoal canister behind the fuel tank. Based on what the code is saying, it would seem that it could be that.

BNRacing

iTrader: (1)

I had the same code, replaced the 3 items in post #5 and it fixed it.

nutty21

iTrader: (1)

You wouldn't happen to have the part number for this by chance?

Balt_and_Vette

You might also have to replace your canister in the back. There is a check valve inside it and it can get gummed up.

Stamina

I believe the one I'm thinking of that goes in the side of the canister is the same one you posted up actually. At least it looks to be, based on what I can tell on part diagrams.

nutty21

iTrader: (1)

Sounds like this may work then.

Will keep you all posted when the part comes.

Guess this isn't an easy code. Seems there's a lot of things that could possibly be wrong.

sswitnutz

This is a sensor located under the hood.. Doesnt cause any change in performance

Stamina

That's incorrect. The MAP sensor you're thinking of doesn't have that green rubber seal, has a different part number, and also goes in the IM. This is the fuel tank pressure sensor (also a pressure sensor, like the MAP/TMAP sensors) that connects into the evap charcoal canister (#24 in the diagram).

casasgonzalez6824

I recently had this code too! What does the car do when this code?? My car had trouble when I filled up the gas tank & would boost low boost between 6-12psi on each gear ! I went back where I got tuned and he replaced the valve assy in the picture ^ it was boosting really good til 3-4 days later now 1 st gear won't go over 8psi

ECaulk

iTrader: (6)

Sounds like a boost leak, start a new thread in the problems sub-forum (include information about your cobalt and more specifially the issues in a numbered list, it reads easier). This is a 2yr old thread

stevehendo34

Having this code and my car about dies when gas cap off when filling. Runs fine when with cap on. Do you think this is a diagnostic code on the pressure sensor before any evap testing is done by the car. Were is the tank pressure sensor is it under the tank or by charcole canister. Hope I can limp it until spring.

tomj77

iTrader: (2)

I didn't have a code but I had issues filling. Pump constantly clicked off when refueling. I changed everything. The canister , purge solinoid, vent solinoid and fuel tank pressure sensor. No issues since.

bahoodle

wat was the fix for this code ? is it the pressure sensor purge valve vent valve charcoal cannister or gas cap or hoses lmao

bahoodle

i replaced the pressure sensor n it got rid of it for anyone else with this code :P