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GMC Yukon Denali Problems

Check Engine Light Due to Gas Cap Issue on GMC Yukon Denali

Problem Description and Possible Solution

A Loose or worn gas cap may cause Check Engine Light to illuminate.

(68 people reported this problem)

GMC Yukon Denali Vehicles With This Problem

RepairPal Verified
Average mileage: 101,700 (30,000–190,000)
12 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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Viewing 1-20 of 23 comments
check engine light came on and message appeared that the gas cap needed to be tightened. had diagnosised to determind gas cap was no longer sealing properly- replaced gas cap, but check engine light still on
Gas cap sensor triggers check engine light. Despite replacing gas cap at the dealership the light goes back on.
"tighten fuel cap" persistent problem, replaced cap, replaced tank vent solenoid (that fixed the slow fuel fill problem). Cleared faults for about a month then get a periodic "tighten fuel cap" and check engine.
Check gas cap light came on, tighten gas cap. A day later the light came on again. We replaced the cap. A week lated it happen again.
replaced the cap. Went off for on day and came on again. Went to auto zone they found code was for purge solenoid.
Replaced solenoid.
My check engine light came on and i took it in to get it diagnosed. it was a gas cap leak. they replaced it with a factory gas cap. i had an aftermarket locking cap before.
MIL light comes on right after I fill gas tank and drive at speeds over 70 MPH. New O2 sensors, New air filter, new spark plugs, new plug wires, and I still get a P300 trouble code. (Random multiple mis fires). No help from Dealership other than an offer to TRADE IN TO buy "THE NEWEST CROWN JEWEL". Well, BS to that...
1)"Tighten loose gas cap" warning message came up twice in the message display.
2)"Engine light" illuminated on the dash cluster.
3) Gas cap WAS loose, re-seated & tightened cap - haven't replaced, yet. Will recheck this PM.
Got a diagnosis with a code using the code machine...the code could have been a couple things related to gas, but it was determined that it was just that the gas cap was too loose ....just replace the cap.
Worn gas cap causes check engin light to come on. Only the $25 GM cap works to fix the problem.
Can not get the check engine light off. I am not able to pass emission until I do, no emissions no registration, no driving my car. On my 4th trip to the dealership. They are as frustrated as I am.