Question about 2007 Chevrolet Uplander

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The engine light came on and we had Auto Zone put it on the machine and told us that it was the gas cap. We replaced the gas cap but the light has still not went out, is there a way to reset it?

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I had a sensor behind my gas tank that was stuck open. i am not sure what they call it, but once it was replaced, my light went off.

Posted on Nov 08, 2012

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You can reset it with a code reader. However, the light will go out on its own after you fix the fault. It may take many start stop cycles. The computer will run tests to determine the cap is holding pressure. When it is satisfied that the problem is fixed it will turn off the light. Be patient. This will only happen if you replaced with the correct gas cap.

Posted on Sep 08, 2010

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jturcotte
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SOURCE: Check engine light came on

Hi, if the code was P0455, there are other possible reasons. The computer fuel tank pressure sensor has detected a leak which could also be in the vapor canister, or the hose from the canister to the purge valve, or the purge valve itself may be leaking. Please inspect the system for these leaks. I may be able to provide some pics of these parts if you tell me your model, year, and engine info.

Evaporative Emission Control System Leak Detected (no purge flow or large leak)
What does that mean? This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
Symptoms You likely won't notice any drivability problems.
Causes A code p0455 most likely means one or more of the following has happened:

  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system
Possible Solutions With a p0455, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

Posted on May 15, 2011

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Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

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