2006 GMC Yukon Xl Denali "gas cap" Questions

the check engine light is on and daily a display "tighten gas cap" goes on with the gas cap tight? the seal on the cap itself has gone bad,, replace the cap

...gas cap comes on. I've replace the gas cap and it still happens. 2006 Denali 6.0L engine I just repaired this problem this past weekend. It is the Emission Control Solenoid. It is located next to ...

...gas cap, it went off for a day. Now it is back on and the gas cap trick isn't working. (which I don't think did anything for me in the first place, coincidental I am thinking). any ideas??? Get the ...

...gas cap and then service engine soon lit. Replaced with factory new cap and reset service engine soon light by disc negative battery lead. about 2 drives later the tighten gas cap lit again then ...

...gas cap is not installed or working properly ?The purge solenoid has failed ?The canister is plugged and not working properly With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here ...

...gas cap and listen at the fuel tank filler tube for a humming sound for a few seconds fuel pump running,If you don't hear a humming noise check fuel pump fuses,if you hear pump running it is a good ...

...p0440 how can I fix THIS CODE IS 90% OF PEOPLES ISSUES TODAY. MAKE SURE GAS CAP IS NOT OLD AND ALWAYS TIGHT AFTER FILL UP. IF CODE RETURNS YOUR NEAREST MECHANIC THAT HAS A SMOKE MACHINE WORKS ...

...GAS CAP REMOVE FUEL PUMP RELAY START ENGINE UNTIL IT DIES LACK OF FUEL. FUEL FILTER IS MOUNTED TO THE RIGHT FRAME RAIL.NEAR THE FUEL TANK.YOU NEED A FLARE NUT WRENCH TO LOOSEN FUEL LINE AT FILTER AND ...

...gas it to about 2000 rpms. Don't cap the bottle until the thermostat opens. If it vomits, change the thermostat and again make sure the electric fans kick on or the clutch fan speeds up at about 210 ...

...IT COULD BE? Time for oil change? Loose gas cap? Auto zone and several other parts stores will hook a reader to the plug under the steering column and read the code. Best news is they do it for