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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: 4 years ago.
Category: Chevy
Expert:  Dave Nova replied 4 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, Chevrolet Technician
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