2017 GMC Yukon: misfire or rough idle

Filed Dec 13, 2025 · Engine · NC

Sitting at stop light engine began running rough and smoke coming out. CEL came on and began flashing, pulled over and had it towed. Diagnosis was PO300 misfire, dead miss on cylcinder 4, cylinder plug 4 is fuel fouled, cois is fine has good spark- caused by failed lifters. Needs engine replacement. Vehicle always serviced, garage kept and in mint condition with 89K miles.

Filed Nov 22, 2022 · Electrical, Transmission · LA

First problem started back in May.. it’s went downhill ever since. Hard shifting was happening. GM dealer said I needed a new transmission. Found out from local repair shop that I needed a torque converter ($600) multiple transmission fluid changes (apparently many issues for A Lot of people) changed that. Then had to change Valve Body & TCM. ($540) everything started working but not 100% did a full tune up having multiple misfires constantly then shuttering when idle. Also replaced ECM ($200+)After changing all spark plugs, wires, oil, etc. the AC was having issues had been having issues for months. Kept adding Freon had to replace AC Condenser (works great now, was told by repair shop that’s also very common in these year models. Condensers are all weak in the same spot) just recently October 2022, my instrument cluster started going haywire. Gauges going off and on screens going blank. Had Alternator and battery tested both test fine. No loss of power but when hitting the start/stop vehicle would continue to run and lock and unlock when it wanted. Husband took the alternator out to have it tested again. They tested 3x 1st. Good, 2nd Error, 3rd Bad ( it was overcharging at 16.5V) replaced Alternator ($290) gauges still going haywire, like before it is only sometimes, when they do it’s bad bad.. but I can also drive to town and back 20-30 miles and not the first issue. Just left GM with a new Battery Distribution Fuse Block ($153) because of course it can’t just be a regular ($8-10) mega fuse, hopefully this will fix my issue. We pay too much money for this vehicle to have all of these issues & none be under warranty. I’ve been having the TAILLIGHT ISSUES as well ever since I purchased the car in 2018. When I received the recall on the taillight it was 6 years up to 72,000 & of course my vehicle had 79k miles on it at that time so that’s wasn’t covered.

Filed Jul 31, 2020 · Engine · 53,422 miles · AR

Check engine light came on and flashing, stabilitrack light comes on, vehicle idles rough and eventually stalled out. This has happened to me twice in my 2017 gmc yukon. Once at ~53k miles, again at ~64k miles. One time it stalled on the side of the road with my kids in the vehicle with me late at night on vacation and had to be towed in the middle of the night and we had to stay in a hotel out of town unexpectedly. The 2nd time happened closer to home but had to pay for a rental car since this is my only vehicle and the dealership no longer does loaners. The vehicle runs rough while driving, loses power, and seems to lose control. It is very scary when it happens. Happened in oct 2019 and again july 2020. It is the same issue as described in n182198000 special coverage memo (dcs5097) from july 26, 2019 but isn't covered in my state yet apparently.

Filed Jun 4, 2020 · Engine, Fuel system · 48,000 miles · UT

Vehicle has a rough idle at cold start. Also misfires at stoplights and random times. Vehicle stalled once this morning completely. Told by my gmc dealership this is a common problem and I would have to replace all fuel injectors for over $2,000. I just purchased this vehicle in march. The fuel injectors are on back-order currently so I am unable to have it repaired. I was told another vehicle like mine at that service center has been waiting already for 6 weeks for fuel injectors and that I would have to wait at least another month. This means I will not be able to register my vehicle with my state as it will not pass smog inspection with a check engine light. I have been unable to register it due to the dmv closure from covid-19. Its very dangerous to drive a vehicle that can stall at any moment and is impossible to fix without waiting for parts. These parts are obviously on back-order so long because this is a widespread problem. I found a service bulletin from the federal safety agency ( dcs5097 ) which covers my problem exactly. But for some unknown reason, special coverage only applies to 13 states. I believe this is a much more widespread problem than thought and I believe my safety and the safety of those around me is at risk if I drive this vehicle. My vehicle and those like mine should be covered by special coverage as well. And at the very least the parts to fix this should be available given that its been a known issue now for well over a year. These parts have been back-ordered way before covid-19 even hit, so it cannot be attributed to that. Gm has an obligation to keep their vehicles on the road safe and maintained to the best of their ability and when it comes to this issue they are failing to do so.

Filed Sep 8, 2018 · Fuel system · 47,000 miles · ID

I have 47,078 miles on this vehicle. It currently has a random misfire that is being blamed on bad fuel injectors. To replace all of my fuel injectors will cost me approximately $1783.00 at my local dealership as my vehicle is 10,000 miles over warranty. I shouldn't have to be replacing fuel injectors on a 1 year old vehicle. It runs on limited power mode when I start it. I have to start it and then shut it off again for it to run in normal operation but it still shows a misfire code.