2008 GMC Yukon engine problems

Filed Oct 7, 2025 · Airbags, Brakes · MI

the passenger-side frontal airbag inflators, The determination was made that the propellant in these inflators may degrade after long-term exposure to high humidity and temperature cycling, which could cause the inflator to rupture during a deployment.

Filed Apr 29, 2025 · Engine · NY

I purchased a MagnaFlow aftermarket catalytic converter system for my 2008 GMC Yukon SLT 5.3L through Walmart’s online marketplace, sold by a third-party vendor called OurDealsRock. The product was advertised as “50-state legal” and compatible with vehicles registered in New York State. However, shortly after installation, my check engine light turned on, and diagnostic codes P0420 and P0430 (Catalyst System Efficiency Below Threshold) appeared. Initially, I thought this was a minor sensor issue, but over time, the vehicle’s performance gradually deteriorated. I noticed reduced acceleration, poor fuel economy, and eventually significant loss of power. The vehicle began shaking under load, misfiring, and overheating. These symptoms worsened steadily—not immediately—but progressively after continued driving with the aftermarket converter installed. I had the vehicle inspected by a certified mechanic, who confirmed that the MagnaFlow converter was not CARB-compliant, was not approved for use in New York, and that it had been illegally marketed as such. He also informed me that prolonged use of a non-compliant, malfunctioning converter caused excessive backpressure, leading to complete engine failure over time. The diagnosis was confirmed by a second mechanic before I committed to the engine replacement. The product was later removed from Walmart’s site, becoming unavailable for sale in my zip code [XXX] ) shortly after my initial complaint. This shows clear acknowledgment that it should never have been sold to a New York consumer in the first place. But by the time it was taken down, the damage had already been done. Component/system that failed: •MagnaFlow aftermarket catalytic converter system •Ultimately caused failure of the vehicle’s engine block Safety concerns: •My family and I were unknowingly driving with a damaged and failing engine •The vehicle’s degraded performance, overheating, and power loss could have compromised our safety during highway d INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORM

Filed Oct 4, 2023 · Engine, Fuel system · WI

When beginning to drive forward after coming to a stop at an intersection. The vehicle will often stall in the middle of the intersection. Requiring me to switch it transmission into natural and restart it as it’s rolling. I almost gotten rear ended many times I always get honked at. It just a matter of time before it causes an accident. It sometime happens after turning as well. I looked at forums on this gmc Yukon hybrid. And it looks like many other owners are asking the same question and nobody is coming up with any answers. Other customers say the dealer told them the hesitation is Normal. I took my truck into a local repair shop and he called me after three weeks saying it was done, but it still had the check engine light on and still is stalling out in intersections. Charge me $2000. This has been happening daily since I got the vehicle

Filed Jul 9, 2023 · Electrical, Engine · WI · fire

It started shutting off at a light for autostop.but when it would turn green it would intermittently just drop out of autostop without restarting. Then may start back up or maybe not, many time after restarting at the light it would died in the middle of the inspection. A parasitic draw kept killing the accessory 12 V battery replaced the 12 V battery but the problem continued. When the truck was running it would run flawlessly,before stalling. The code said to replace the auxiliary fluid pump. I had it a new auxiliary fluid pump installed. After this the vehicle wouldnt crank. They then worked through a service bulliten fixing a list of areas were the harness was chaffed and shorted. The truck has been out of commission the past 10 months and intermittently started twice during this time, it ran rough for 5 mins and died out at the first stop sign and wont crank again. Some times it will crank but not start.

Filed Jul 1, 2022 · Engine · MO

Oil leak in Engine in motor problem

Filed Jul 1, 2022 · Engine, Suspension · MO

Truck stop without any warning for no reason oil is leaking from the truck for no reason just got it not long ago

Filed Feb 23, 2022 · Engine, Fuel system · SC

Model year(s):2009manufacturer:general motors corp.campaign id number:09v154000potential number of units affected:27188summary:gm is recalling 27,188 my 2009 cadillac escalade, escalade hybrid, escalade esv, and escalade ext; chevrolet avalanche, suburban, tahoe, tahoe hybrid, and colorado; and gmc yukon, yukon hybrid, yukon xl, and canyon vehicles. The fuel system control modules may have a condition in which an adhesive separation of the room temperature vulcanizing (rtv) seal between the seal and the housing may allow water to seep into the module.consequence:water in the module could cause a short or open circuit, illumination of the service engine soon lamp, setting of diagnostic trouble codes or the engine may be hard to start, may not start or may stall increasing the risk of a crash

Filed Oct 3, 2018 · Driver assistance, Engine · 134,000 miles · AZ

I have a 2008 gmc yukon slt that I bought in feb of 2015 with 94,000 miles. I have serviced it regularly from day 1 and even paid it off in 2.5 years. As soon as I paid it off, the very next month, my engine started making a weird noise once in a while w/ no check engine light so no one could tell what was wrong. At that same time my "service stabilitrak/service traction control" would ding about 40 times in a row. I serviced the 2 and it did not help for more than 2 days and it started again. This time the check engine light came on codes were for new plugs and fuel filter. Still didn't help. Then my engine blew! Got that replaced and it still to this day is doing same thing! So, like the 330 others, we have a major safety issue that no one cares to address, and I'm done trying! If this man are having the same issue it's a gm issue! I'm copying the federal safety agency and my atty general for help. Please click this link and read 330 complaints about the same exact thing and youtube has people actually stuck bc their car died. Mine did not ever die but it sure feels like it is and . It happens every single time I drive my yukon! Please help us! I'm on unemployment and cannot afford anymore repairs. I shouldn't have to pay for this many things to be fixed and still not touch the problem! [xxx] parts of this document have been redacted to protect personally identifiable information pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Jan 22, 2018 · Electrical, Engine · 160,000 miles · MO · fire

The vehicle caught fire while parked and ignition turned off. Fire appeared to start in the engine area. Vehicle had been parked and turned off for approx 1.5 to 2 hours before the fire was reported.

Filed Feb 8, 2017 · Driver assistance, Electrical · 120,000 miles · OK

The car flashes reduced engine power, stabilitrack off and the car can barely go 30 MPH. The engine runs very rough when it is doing this also. My code scanner displays code 641 which is open 5volt reference on bank 1. It does this more when the weather outside is warmer or the car has been sitting still while running. On more than one occasion it has happened while pulling out into traffic causing near misses and other times while driving down the highway. Just yesterday it did it 20 times in a four mile stretch. This car is no longer safe to drive.