GMC Yukon Denali check engine light comes on

Filed Aug 13, 2025 · Engine · 96,000 miles · TX

The contact owns a 2015 GMC Yukon Denali. The contact stated that while driving 80 MPH, the vehicle hesitated, and failed to accelerate as intended while depressing the accelerator pedal. In addition, there was an abnormal knocking sound coming from underneath the passenger’s side of the vehicle. The check engine warning light was illuminated. The contact arrived at the residence and used a personal diagnostic reader and retrieved information related to misfires in cylinder #2 and #4. The contact replaced the spark plugs and the ignition coils. The contact test drove the vehicle, and the check engine warning light later illuminated. The contact swapped the ignition coils; however, the failure persisted. The vehicle was taken to the dealer where it was diagnosed that Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) had failed and caused the lifters to fail. The vehicle was not repaired due to the cost. The vehicle remained at the dealer unrepaired. The manufacturer was made aware of the failure but offered no assistance. The failure mileage was approximately 96,000.

Filed May 1, 2025 · Engine · 74,000 miles · CO

The contact owns a 2016 GMC Yukon Denali. The contact stated that since owning the vehicle, the engine had failed on three separate occasions. The contact stated that prior to each failure, there was an abnormal rattling sound coming from the engine. The contact stated that the check engine warning light was illuminated on the instrument panel prior to the last two failures. The vehicle was taken to an independent mechanic after each failure, and the engine was replaced twice. Recently, the contact was informed that the catalytic converter needed to be replaced; however, the vehicle was not yet repaired. The manufacturer was notified of the failure, and the contact was informed that there were no recalls on the VIN for the engine. A complaint was filed with the manufacturer. The failure mileage was 74,000.

Filed Jan 21, 2025 · Engine · 72,000 miles · IA

The contact owns a 2019 GMC Yukon Denali. The contact stated that while driving at an undisclosed speed, the engine made loud knocking sounds, and the vehicle lost motive power. The check engine warning light was illuminated. The vehicle went into LIMP Mode but was able to drive to the residence. The vehicle was towed to the dealer, where it was diagnosed that the lifters had failed, and that the engine needed to be disassembled for further inspection. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was opened. The failure mileage was approximately 72,000.

Filed Jun 23, 2019 · Transmission · 80,100 miles · NC

I have only owned this car since 3/29/19 and several times now my yukon's check engine light has came on after the transmission bucks, jumps or jerks hard, not sure what to call it but it bucked or shoved my car forward when trying to slow down or stop (not pressing gas pedal). This could be dangerous as it interferes with trying to stop the vehicle. It was such a hard jolt that it for a minute I thought another car rear ended me. This has happened at least twice after I pressed the brake to begin slowing down as I was preparing to pull into a parking lot, I was probably going around 20mph. It also happened twice while accelerating onto a road, probably going 35 MPH and just felt a jolt like something kicked my car forward suddenly. I've been told that the jerking problem is related to issues with the transmission, possibly the torque converter and causes gears not to function properly. I'm going to put in my most recent date that this happened on your form but it's happened more than once.

Filed Mar 4, 2019 · Fuel system · 35,566 miles · WI

Purchased a used 2017 gmc yukon denali with almost 36,000 miles. 4 days after the purchase my engine light came on. Next morning the vehicle was not driving right, very slow moving (couldn't go faster than 45 miles per hour), very shaky, loud, felt like it was either going to die on me or blow up. Had onstar check it out with several issues reported, took to dealership right away. 3 fuel injectors were failing and were replaced still under warranty. Fuel injector #3 was replaced prior to my purchase of this vehicle and now again replaced along with injector #5 & #8. 2 weeks later engine light came on again. Drove ok, took to dealership, fuel injector #1 now going out. Parts on back order....got a call this morning that parts are in (had to wait over a week). I am now over the 36,000 miles and will therefore be paying to replace this injector. Opted to have all the other injectors replaced as well. Very disappointed in this vehicle as it is only 2 years old. I am a single mom and need a reliable vehicle, which this vehicle is less than reliable. Had this vehicle a month and its been nothing but a headache and in the shop 3 times. These issues must be common since the fuel injectors were on backorder and this problem should have a recall.

Filed Jan 8, 2019 · Engine · 62,000 miles · MI

Tl* the contact owns a 2015 gmc yukon denali. While driving, the check engine warning indicator illuminated and the vehicle started misfiring. The vehicle was taken to lunghamer buick gmc (5825 highland rd, waterford twp, mi 48327, (248) 461-1000) where it was diagnosed that the engine valve lifter number seven failed and needed to be replaced. The vehicle was repaired, but the failure recurred. The vehicle was taken back to lunghamer buick where it was diagnosed that the engine lifter number five failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failures. The approximate failure mileage was 62,000. *tt consumer replaced all the lifter on the truck.

Filed Mar 21, 2018 · Acceleration, Driver assistance · 152,000 miles · NV

I have a 2003 yukon denali I purchased and it has given me the reduced engine power light and almost had a few accidents on the highway because it drops the speed to 20 MPH also it has the check engine codes as p0120 and p2135 I have been aware that gm has not found a solution to this and wanted to see if there is any recalls as I am very afraid of being in a very serious accident with my children in the car. The consumer stated the vehicle was repaired and requested withdraw the complaint.

Filed Mar 18, 2018 · Driver assistance, Engine · 20 miles · IN

As we are driving down the interstate our yukon loses all power, engine turns off, stability control message comes up, tire pressure sensor message comes up. We pulled over to the side of the road and try refiring the engine. It feels like the engine is about to jump out from under the hood. We turn it off and wait about 5 minutes. Start the engine back up after waiting and it drives ok, but engine light is on. This has happened to us twice in two days time.

Filed Jan 31, 2018 · Electrical · 126,283 miles · LA

Key gets stuck in the ignition all the time. The truck goes into complete shut down of all electrical components, I mean absolutely no power. I can't even call on the blue on star button. I took it to walker gmc in alexandria, la on january 15, 2018 because the engine light was on. They said they fixed it and although the engine light is no longer coming on, the truck continues to go into complete electrical shut down every few days. I took it to another dealership to test the battery and the alternator but they reported the battery was at 100 percent and the alternator passed all the checks. I'm at a lost but I do not want to risk traveling with my daughters and the truck just completely stopping on us on the highway. What do you suggest I do next?

Filed Aug 21, 2017 · Driver assistance, Electrical · 150,000 miles · LA

Instrument panel is going out, one instrument at a time. First showing low oil pressure, stabilitrak warning, check engine, now it is the RPM gauge that isn't showing anything. Also have a huge crack in the top of the dashboard that's been there for about 5-6 years. I've seen online complaints off this issue.