Problem Description and Possible Solution
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Average mileage: 105,703 (42,000–198,000)
Exhaust & Emissions affected: Gasoline
15 model years affected: 1996
, more2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
52 people reported this problem
Check engine light came on and would not go off. Repairmen checked vehicle w/instrument and item was corrected
My check engine light keeps coming on for no apparent reason then goes off?
After repeatedly getting a Check Engine light after fueling, I took it to a dealership who informed me that the code that showed up when they hooked it up said that I needed a new gas cap. Well, I paid the big $$ there for the cap and a couple weeks later it came on Again!! This time I took it to my normal oil & tire guy who let me in on the real issue (in my case at least!) I hadn't been tightening the fuel cap enough "clicks"!! I might stop at 2-3 & he said turn til you hear at least 10! Otherwise the vehicle senses that as a "leak" in the fuel system, be it fuel or air/compression. This happens quite often in many other makes/models too! Hope this helps someone!
Check Engine Light due to emissions issue that sounds like this one. Tech ran OBD2 scanner on it and found the code related to a fuel system emissions problem. Gas Cap is suspected.
The 'Tighten Gas Gap' came across monitor 2 days ago. I tightened gas gap. The monitor reading went away. This morning, the 'Tighten Gas Cap' came up on my monitor reading again. I turned car off for 1-1/2 - 2 hrs.. When I got back in car, started it up, while driving, the engine light came on. Panicking ..... Called a friend for a car repair persons name & they suggested I google the problem. I did. Yippee!! I found this is a 'problem' w/ this make and model year 2004 Suburban. I tighten the gas cap really, really hard & the engine light is no longer on. Thank you! Thank you! for those who've reported the same challenge.
Check gas cap light came on, then check engine light came on and stayed on. Code showed gas cap was bad, replaced and problem was still there. Examined entire sytem for pressure leak and found that the fuel pressure sending unit and gasket was bad. Replaced. problem solved.
Check engine light is still on. Just replaced gas cap.
Would like to add that something is going on with my emissions. Took vehicle to car shop today, and it is to the point either the vehicle will continue to go uncontrollably or it will not start up at all. If it goes on uncontrollably then I was told to pop it in neutral and let the engine blow up.
Check Engine light came on. I fixed it by removing the gas cap and re-screwing it back on tightly.
Check engine light stayed on and once the cap was replaced, it stopped.
This occurred occasionally at first and then more frequently. About 40,000 miles it never went off. I had the system tested and was told there is a seal leaking at the TOP of my gas tank. Due to the cost of labor, this will be a repair close to $600.