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

 

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

 

Never given me any of those problems ^^^

 

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

 

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

 

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

 

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...

 

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.

 

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

 

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

 

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

 

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.

 

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.

 

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

 

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).

 

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

 

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

 

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.

 

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.

 

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

 

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