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The other day on the dashboard of my "2006 Pontiac G5 2.2L engine" a message came on telling me to check gas cap so I did, so I replaced the gas cap with proper new cap. message still came back on then went out after 2 days then the engine light came on so I looked under the hood and saw a PVC crankshaft hose had a 3/4" cut so I replaced the hose and we erased the code and light went out for a few days until I passed a transport truck after flooring it to get around the big slow moving truck. Any ideas???

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Massive evap leak? oh my god i hate this..... first the new gas cap didnt fix your problem... the seal on them are@#$% . second, if your car is running when filling gas you get this message....third, make a rubber,cork,or leather seal to fit your gas cap or find a better fitting cap...doesnt have to be OEM.. hope this helps!

Posted on Nov 11, 2014

Testimonial: "Found the code...OBD11.."P0455" Pontiac Emission Control leak detected gross leak. Problems that causes this is common they say - Missing or loose gas cap, incorrect fuel filler cap used or filler cap remains open or fails to close, foreign matter caught in fuel filler cap, EVAP canister or fuel tank leaks, EVAP system hose leaking and fuel tank leaking. I replaced the gas cap and is on tight and no foreign objects in fuel filler cap and gas tank not leaking so it's not that and probably is a EVAP canister or EVAP system hose...hmmm."


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It needs a code scanner hooked up to it,to tell you why the light is on and the cause. If there is an autozone near you take it there or
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most likely the pressure sensor in the fuel tank for the evap system is defective.

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The other day on the dashboard of my "2006 Pontiac G5 2.2L engine" a message came on telling me to check gas cap so I did, so I replaced the gas cap with proper new cap. message still came back on the

Flooring it would cause change in ride / weight position of vehicle ---Gas in Tank moved / Sloshed around .. EVAP Hose that Vents gas odours to atmoshere when hot weather creates fumes / pressure Could Be Plugged ..MAYBE Early warning of Fuel Pump Failure so keep car under 1/2 tank an save alot of grief #@%^&*%$ IF this pump fails ..Fuel rail pressure ++ flow consistancy can be test at fuel rail port by gauge { autozone - O riellys } will also show weak injector when engine floored .

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