Gas cap, cracked vapor line, flooded vapor canister, fuel tank vapor check valve. You may need a shop to do a smoke test on the system.
Some EVAP system leaks are so small they can't be seen with the naked eye. This is why a smoke test must be done to find the leak. An engine vacuum leak can also trigger an EVAP system code. I just ran into that with one of my vehicles. Hope that helps! Jim
replaced solenoid valves and fuel tank pressure sensor
2003 GMC Yukon XL 1500 SLT 4WD
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Maintenance & Repair
There were no codes showing up through the DIC when I was checking out the vehicle, but three days after buying it the engine light came on. I connected my diagnostic reader and it shows I have a majo...
2006 GMC Yukon XL 1500 SLT-1 RWD
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Maintenance & Repair
I have a 2007 GMC Yukon XL that has a very loose Ground cable on the battery terminal. The terminal is closed as tight as it will go, however it still moves on the Ground post freely. The computer r...
2007 GMC Yukon XL SLT 4WD
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Maintenance & Repair
Running the heat split between the dash and floor vents in a 2008 Yukon XL. The heat is cold on the passenger side on the floor. What is the problem? Actuator? If so which one? Thanks!
2008 GMC Yukon XL SLT 4WD
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Maintenance & Repair
No matter cold or hot, the air only blows through the defroster vents, no matter which setting is selected.
2001 GMC Yukon XL 1500 SLT 4WD
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Maintenance & Repair
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