Three problems related to check engine light on have been reported for the 2015 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Yukon based on all problems reported for the 2015 Yukon.
When sitting at a light, or stop sign vehicle acts as if it wants to cut off, check engine light is flashing, when I'm driving vehicle the check engine light stays lit. I did a scan of the vehicle and the code I got was p0303 which is for a cylinder 3 misfire. I have changed out the spark plugs and wires, also the ignition coil. I changed out the fuel injector for cylinder 3 and also the fuel pump actuator. Its still shaking, don't know what the problem is but I hope you guys can come up with what I need to do next. I've had to spend money out of pocket for this because its not under warranty.
I put in another complaint and forgot to add maybe the most important details!!!! I have noticed my cruise control, check engine light, brake lights, and remote start though I'm having issues with them all working only when they want to it seems when it's hot outside all of these things go hay wire and when it's freezing cold (colorado winter) everything works fine. Today high of 40 everything is working fine. . . Highs in the 80+ everything seems to not work. So it's basically boiling down to electrical issues when it's hot and no issues when it's freezing cold. Can someone please fix this!!!! I've seen numerous complaints of others having the same issues with heat and electrical issues. (cargurus. Com) please someone do something gm needs to fix this!!!!!!!! I only hope others have made these complaints so gm can be held responsible! 800$ for a brake light get out of here!!!!!!!! and that's just the price to fix the brake light when it decides not to work and I'm not paying that much to fix one issue when it seems to be something with this vehicle and heat!.
When the car is at idle in drive it becomes very rough (fluctuates up and down). This happens on and off and I have no check engine light on. Sometimes the car even feels like it is going to stall out. I have had it into the dealer and they admitted they feel it as well. They tried adjusting the motor mounts and that did not do it. After having in the dealer for several days they called me and said they can't find the issue. They told me they went into another 2015 GMC Yukon sle and started feeling the same issue. It was stated to me I might have to wait for more complaints on the vehicle to get to the root of the issue. It continues to idle roughly and I want to get this resolved.