How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dave Nova Your Own Question
Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19450
Experience:  ASE Master Certification. GM World Class Certification
11042942
Type Your Chevy Question Here...
Dave Nova is online now
A new question is answered every 9 seconds

Chevy Impala: OBD2 Code P0455..Emissions..Control System..Leak

Resolved Question:

Chevy Impala 2007. OBD2 Code P0455, "Evaporative Emissions Control System Leak Detected (gross leak)."

Any ideas?
Submitted: 6 years ago.
Category: Chevy
Expert:  Dave Nova replied 6 years ago.

Typically this code will set when the computer senses that there is a leak in the evap system. What that means is the fuel vapors in the tank are sealed and the system will pull the vapors into the engine to be burned. If the computer senses that the system is no longer sealed, it will set this code. Common causes of this code setting are a loose or missing gas cap or a gas cap that has a bad seal. If the gas cap is good and has not been left loose, the other cause could be a bad evap vent solenoid valve. If the valve sticks open, the same code will set. The vent valve is located under the car near the fuel tank.

 


Object Number:(NNN) NNN-NNNN Size: SH
Click here for detailed picture of above image.

  • Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  • Disconnect the EVAP canister vent solenoid valve electrical connector.

  • Object Number:(NNN) NNN-NNNN Size: SH
    Click here for detailed picture of above image.

  • Disconnect the EVAP canister vent solenoid valve from the EVAP emission canister hose.

  • Object Number:(NNN) NNN-NNNN Size: SH

    Dave Nova and 3 other Chevy Specialists are ready to help you