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My 2010 GMC Acadia registered a p0451 code. Would it be the fuel tank pressure sensor or something simple like a faulty gas cap. I've already replaced the solenoid vent valve I believe it's called but code is still showing up. Thanks

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The code is for a Pressure Sensor Range issue

You changed the vent solenoid valve-Why?

Now you ask about a Gas Cap-Why?

Best you leave testing the Evap System to the pros
or study how the system works- assuming you have
not purchased the required factory manuals, if you
plan on working on any vehicle yourself

Have to learn the system- before you can even component
test it ,to find a problem

Posted on Dec 03, 2014

  • 1 more comment 
  • Brandon freese Dec 04, 2014

    These are the issues that all the forums are suggesting that's why I ask. I'm sure it's a pressure issue because when we remove the gas cap it has a substantial vacuum on it and then the vehicle immediately starts to run rough and die. I guess I'll have a mechanic tell me. I like doing all my repairs myself and was hoping someone on here could help me get to the root of the problem instead of just telling me to leave it to the pros. Thanks

  • Anonymous Dec 04, 2014

    Youbeing told to have the pros work on it because only they havethe diagrams of the vehicle systems with the fault & the proper tools to look at data & do the required testing We could teach a class but you still woud d those test tools to find a problem

  • Anonymous Dec 04, 2014

    If you do not learn a vehicles system,all it' components & how to test them you can not work on it yourself If you don't know someting you cn'find a problem or resolve it



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