Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Car Problem Reports
GMC Envoy Check Engine Light Due to Gas Cap Issue
GMC Envoy Problem
Average Mileage: 87,646 mi (37,125 mi - 197,000 mi)
Visitor, 2005 GMC Envoy, 58,000 mi
My engine light was on and I checked the gas cap. It was not screwing on prperly and would pull right off. The engine light turned off as soon as I replaced it and started to drive off.
Visitor, 2006 GMC Envoy, 78,256 mi
Check engine light keeps coming on has been checked at dealership. Mechanic said gas cap is causing problem. So off to get a new cap.
Visitor, 2005 GMC Envoy, 52,000 mi
The check engine light started coming on and I had heard that it could be a problem with the fuel cap. I tried tightening it up when I fueled up and this helped for awhile. Now it stays loose and the light stays on, guess it is the firt vehicle that I've ever owned that had a sensor in the gas cap or a gas cap that didn't fit right. I also found out that this will cause the fuel gauge to work crazy, too.
Visitor, 2005 GMC Envoy, 50,000 mi
NEW GAS CAP AND DISCONECT THE NEG CABLE ON THE BATTERY TO GET THE LITE OFF
Visitor, 2003 GMC Envoy
BAD FAN CLUTCH! I've had this problem twice. First time at around 60,000 miles. Now again at 228,000 miles. I realize that at 228,000 miles things are going to need replaced or repaired from time to time, but it seems that all of the repairs that I have had to make are repeats of things that I have already repaired peviously. The fan clutch, rotors, linkage, tail-lights & I'm on my third new gas cap. Not to mention that Ozzy Osbourne has been held hostage in the CD player for the last three years! LOL! Actually, I feel like I can't complain too much because given all the miles I've put on my car for the most part it has been a very reliable car. It's never left me stranded anywhere **fingers crossed** and has never felt the cold cruel hook of a tow truck. I will drive it until it falls apart around me because I LOVE IT!
check engine light is on all the time
Visitor, 2002 GMC Envoy
The newer gas caps do not fit properly on the older Envoys creating a problem of the check engine light not staying off.....I'm on #4 and check engine light is still on!
Visitor, 2005 GMC Envoy
I have replaced the fuel cap three times. It works most of the time. At 3/4 tank light comes on and goes out at 1/4 tank and then may stay off for 2-3 tanks then comes back on. Paid over $500 to have the fuel level sender replaced and now get 4-6 mpg less...NO MORE GMCs for me.
Visitor, 2002 GMC Envoy, 115,000 mi
Check engine light would come on and go off for about a week and then stayed on. I hooked up my code reader and the code was for "small emissions leak". I looked up the top solutions for "small emissions leak" and the first one was bad or loose gas cap. I checked the cap to make sure it wasn't loose. That wasn't the problem so I replaced it with a new cap , cleared the code, and the light has stayed off for over 4 months now.There were other potential problems listed but the cap was the most likely and the easiest to try.
Visitor, 2006 GMC Envoy, 102,000 mi
Light on after a 700 mile road trip, caused by gas cap not being all the way on. Then again, check engine light on - paid $62. to have diagnosed (a 2 minute job)... light came back on 4 days later - wish it was the gas cap.