2017 GMC Yukon XL: sudden loss of power

Filed Mar 22, 2026 · Fuel system · IA

Engine stalling, a rough-running engine, reduced power mode (sluggish acceleration), a "Check Engine" light, or the vehicle failing to start. It started puttering really bad and died in the middle of the intersection. Check engine light came on. I got it to start, was really hard start and puttered bad then it died again and then I got it to start again, was a really hard start and puttered and died again. I was able to start it again get in the driveway but couldn’t go very fast. Check engine codes present are P2635 and P018B

Filed Mar 1, 2026 · Transmission · WI

Transmission problems, loss of power. Put a reader on car and said it was a selinoid. Replaced that and now it has happened again

Filed Jan 26, 2026 · Transmission · GA

Gear slippage, loss of power

Filed Feb 7, 2024 · Engine · TX

The 'active fuel management/displacement on demand' lifters failed and caused the engine to run very poorly with a significant lack of power. This occurred while driving and could have caused a crash before I was able to get off the road and out of the way of traffic. The problem was diagnosed and confirmed by an independent repair shop. The vehicle had to have the camshaft and all valve lifters replaced, as well as several valves that were damaged in the failure. The total cost to repair was just over $9000. The failure also caused the catalytic converters to become clogged, resulting in even further loss of power from the engine. There were no warning lamps or symptoms prior to the failure. It occurred suddenly as I was driving down the road. Searching online reveals this seems to be a common problem with GM 5.3 and 6.2l engines from 2010 onward. GM is aware of the issues and refuses to assist in any way. Their only response is that the vehicle is "Out of warranty". The failure is caused by a design defect in the AFM/DOD system that starves the lifters of oil, resulting in lifter failure and damage to the camshaft and valves.

Filed Jul 19, 2023 · Engine · KY

I have a 2017 Yukon XL with 80,000 miles on it. Last year I was driving on the highway with my kids when it began to lose power and failed to accelerate. The issue was in the engine and I had to replace the entire engine for $8000 because it was barely past the warranty. Now one year later the car began to jerk and not shift while on highway and it is the transmission that is going to be replaced for $6000. The 2017 Yukon XL is a lemon and very dangerous for drivers. I spent $45k and should not be replacing the engine and transmission withing 6 years of it's age. Reading online these are common issues putting lives at risk.

Filed Sep 18, 2022 · Driver assistance, Electrical · PA

UNKNOWN 4 times in the past 6 months, while parking the vehicle (turning into a spot, left or right) or slowly turning to pull up to a security code box, the car completely begins to lose power in drive, and has lost power while in drive twice. The dash begins to flicker to the point that you can't decipher which error codes are showing up. Most recently, the Trailer Brake Service message was on before it died. We were not towing anything, did not have tow mode on, or anything like that. The parking sensors were on for all these instances...regardless if we were parking or not. I can't confirm if that is the issue or not. It was pretty dangerous when I was pulling into my parents driveway along a busy road when the car did this before I was completely off the road...with my 3 young children in the back 2 rows. I know the battery is new. I did have the dealer look at the brakes about a month ago, because I felt they were soft. They said they were fine. They and myself checked the reservoir for brake fluid low. Was in normal range. Starter was replaced in March time frame. I feel this is related to the factory trailering system wiring harness or something.