2016 GMC Sierra 1500: misfire or rough idle

Filed Jun 15, 2023 · Engine · OH

2016 gmc sierra 1500 with a 5.3 v8. Dropped a lifter on cylinder one at 79k miles due to the active fuel management known as AFM and Causing the truck to misfire and shake so bad that the truck turned its self off going up hill on a busy highway at 60 mph causing me to have no brakes nor steering and tried turning the truck back on for brakes and steering and it wouldn’t turn over and just crank. Then got it to crank took it home then took it to the dealership the next day which was 5/30/2023 it was at dealership and they fixed after a week of being in the shop from 5/30/2023 to 6/14/2023 the same day I dropped a lifter on cylinder 7 aswell 2 hours after leaving the dealership causing the truck run even rougher and misfiring.

Filed Apr 17, 2023 · Engine · 81,000 miles · KY

The contact owns a 2016 GMC Sierra 1500. The contact stated that while starting and driving the vehicle, the engine experienced rough idling with the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with a cylinder misfire and that the spark plugs needed to be replaced. The contact declined the repair, and the vehicle was taken to an independent mechanic, where it was diagnosed with codes: P050D, P2099, P219B, and P0300 for the fuel injector. The contact related the failure to Special Coverage Adjustment N182198000 (Engine Fuel Injector); however, the VIN was not included. The vehicle was then taken to Champion Chevrolet Buick GMC (502 S 1st St, La Grange, KY 40031) where it was confirmed that the VIN was not included in the Special Coverage Adjustment. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 81,000.

Filed Feb 21, 2023 · Engine · 113,000 miles · AR

The contact owns a 2016 GMC Sierra 1500. The contact stated while driving approximately 20 MPH, there was an abnormally loud sound coming from the engine. The contact stated that the vehicle would not accelerate above 30 MPH. The contact stated that the check engine warning light was illuminated. The vehicle was taken to an independent mechanic to be diagnosed. The contact was informed that the catalytic convert needed to be replaced and cylinder #7 misfiring. The contact was informed that the rod bearings needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure however, the contact had not yet received a response. The failure mileage was approximately 113,000.

Filed Feb 21, 2023 · Engine, Transmission · AR

I drove up to a yield sign, when on coming traffic was clear I step on the gas then I heard my engine knocking I tried to go but I only could get up to 30 MPH I took it to the dealership they diagnose it and said that the number 7 cylinder had misfired I had a manchanic to repair it and it cost me $4200.00.

Filed Aug 23, 2022 · Engine · 72,727 miles · WV

The contact owns a 2016 GMC Sierra 1500. The contact stated that when the accelerator pedal was depressed, the vehicle responded at a rapid rate of speed. As a result, the vehicle almost crashed into another vehicle. The contact was concerned for her children safety. The check engine warning light was illuminated. The vehicle was taken to an AutoZone where it was placed on a diagnostic machine indicating code P050D. The vehicle was taken to an independent mechanic where it was diagnosed that cylinder #1 had a misfire and the spark plugs needed to be replaced. The vehicle was repaired; however, the contact stated that three days later, the engine warning light illuminated, and the failure recurred. The vehicle was not repaired. The dealer was notified of the failure and scheduled an appointment for a later date. The manufacturer was notified of the failure but provided no assistance. The failure mileage was 72,727.

Filed Oct 20, 2019 · Electrical · 59,900 miles · MS

Remote start on the vehicle does not work sometimes , dic says open and close driver door and the engine light comes on and remain on .I took this vehicle to a technician for diagnostics and computer stated rough idling problem technician clear the engine code.this has continue too happen. Vehicle is always stationary when this happens, I've check around and this is a constant problem for gmc and chevrolet owners .please look into this matter.

Filed Nov 5, 2016 · Fuel system · 200 miles · OH

The quality/precision issues I am having with my vehicle are issues that should not be happening to a $50,000 vehicle. The engine has a rough idle when it is first started up. After the vehicle warms up the rough idle gets worse. It gets even worse while I am driving it and I come to a stop sign or red light. The rough idle vibrates the entire vehicle. The rough idle is at its worse when I stop after having driven on the highway for several hours. I bought this new vehicle because my previous vehicle was totaled in an automobile accident when someone t-boned me in my 2007 gmc yukon xl. My yukon had approximately 200,000 miles and did not have a rough idle or vibrate like my 2016 sierra does. I know the technology is totally different than my 2007 but it should at least idle as good as if not better than my 2007 yukon that had 200,000 miles, but it does not. There is also a hesitation when accelerating from a stop that is getting worse with every additional mile I put on the vehicle. The hesitation is so bad at times I worry the engine is going to stall out on me. It feels/sounds like the cylinders are loading up with too much fuel and are not firing correctly. The stoichiometric ratio is not correct. At times, it feels like a miss. My fuel mileage is also decreasing. In the very beginning I was averaging around 19 miles per gallon and now I am averaging around 17 miles per gallon. I have tried different octane levels of mostly sunoco and bp fuels with no noticeable change in fuel mileage or engine performance except for the above-mentioned conditions getting worse. I am worried this rich mixture will cause premature failure of the catalytic converter and o2 sensor. I am also concerned the excess carbon could build up around the valves causing additional problems down the road after the warranty expires.