GMC Driver Gets A Sensor Error On Her Yukon. Why Has It Taken Months To Fix?

A GMC Yukon owner had a sensor error and now has been at the dealership for over six weeks.

In a TikTok series with over 100,000 views as of this writing, Kristen Negri (@lifeoncordelia) explains the whole debacle she had with her GMC Yukon and the thousands of dollars being spent to fix it.

Negri owns a 2021 GMC Yukon XL with a 5.3L V8 that she says she regularly maintains. This Yukon is her primary car. She says it first started experiencing issues with low oil pressure and low oil levels. The oil ended up going in places it shouldn’t, which ruined the catalytic converter.

The next issue that came was the lifter and camshaft. Negri started noticing her Yukon violently shaking in which the check engine light came on. The vehicle became undriveable, so she says she took it to the dealership. The estimated repair was $9,900, which Negri says she authorized. However, this repair took longer as parts were backordered or unavailable. She was purportedly told it would take two months to fix.

Negri decided she couldn't wait two months and took her vehicle to a local mechanic that had the parts.

The mechanic replaced all 16 filters and the camshaft, she says. Shortly afterwards, the Yukon developed a P0420 catalytic-converter code, intermittent shuddering, and traction-control warnings. The internal material of the left catalytic converter broke into pieces and needed to be replaced. Negri and the local mechanic purportedly believe this was caused by the work on the oil issue performed by the dealership.

The problems didn’t stop there, Negri says. Next she says a cylinder 7 misfire occurred. One valve was shorter than the others, which her mechanic fixed. The valve seat slightly shifted during installation which caused the misfire.

Totaling up all the repairs, Negri’s Yukon has been out of commission for eight weeks.

And now she’s dealing with GM, Negri says.

Woman Versus GM

Initially, GM allegedly offered Negri partial assistance for the lifter replacement and rental car costs. However, they pulled out of that offer after Negri took her vehicle to an independent shop, she says. To try to make up for the scenario, she claims GM offered $3,500 towards a new vehicle.

Via email, Negri told Motor1, “I rejected that as an adequate resolution. A discount requiring me to spend tens of thousands of dollars on another vehicle does not reimburse the money I have already spent or address what happened to this one.”

Additionally, Negri says she’s been seeking answers on why the oil warning levels weren’t addressed earlier, why the parts were drastically backordered, the two month wait time for repair, and why she wasn’t offered a reimbursement.

She also says she’s submitted a complaint to the Better Business Bureau and has contacted GM corporate as well as the Rivard Buick GMC dealership, which she claims has ignored her. The dealership did not respond to inquiries sent via online contact form and email.

The entire experience has been taxing, Negri says.

Negri told Motor1, “I loved this vehicle. Its space and usefulness are exactly why we bought it, and I would have preferred to repair it and continue driving it confidently. Instead, our family has spent approximately $10,000, gone almost 60 days without the Yukon, and dealt with repeated repairs and uncertainty. I have had to consider replacing a vehicle I wanted to keep.”

She believes GM does not care about their customers.

“The most frustrating part is that I sought help through the dealership first. When GM could not supply the parts, I found another way to get our family vehicle repaired. GM then used that choice as the reason to deny reimbursement, while offering a discount to buy another vehicle from the same company. My official position is that GM does not care about its customers whatsoever, and I'm considered one of the lucky ones that made it to 100k,” Negri added.

Gallery: 2021 GMC Yukon / Yukon XL

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“Mine Have Been At The Dealership 16 Times In Less Than 2 Years”

Fellow GM owners who commented on her post shared similar frustrations with the automaker.

“My 2026 Silverado has been at the dealer since July 17th with less than 6k miles for a driveline vibration above 45 mph. Still no idea what is causing the issue,” one wrote.

“Mine have been at the dealership 16 times in less than 2 years,” another added.

“My brother's Silverado is trashed from lifter failure too,” a third chimed in.

Other viewers believe the mechanic messed up.

One opined, “Sounds like he screwed up the job. Cars don’t just work themselves out and catalytic converters don’t just fall apart for no reason. That’s a mechanic’s failure.”

“Bad lifter causes a misfire. Misfires leave unburnt fuel in the cylinders and that can destroy the catalytic converter..... However, yet to see bad lifters cause valves to go bad. sounds like a technician didn't install the camshaft properly and caused valves to touch the piston,” a second speculated.

Does GM Have Lifter Failure Issues?

This isn’t the first Yukon owner who’s claimed they’ve dealt with a lifter failure. Valero Law is litigating a class action case against GM for faulty lifters in GMC Yukon, Sierra, Chevy Tahoe, Suburban, Corvette, Silverado, and Cadillac Escalade. The impacted engines are purportedly the 5.3L, 6.0L or 6.2L V8s.

My Lemon reports that a defective lifter can lead to ticking or knocking noises, misfires, and even catastrophic engine damage. A check engine light will typically come on. This happens when the lifter gets stuck or locked in place, as these engines use both active fuel management and dynamic fuel management.. When this happens, the lifter bends the pushrod, which causes engine failure.

To fix it, you need to replace the affected cylinder head, components, and the damaged lifter. Getting a timely repair has been reported to be challenging, as well, as there are shortages of engine and lifter parts.

Many GM owners believe this isn’t an isolated incident. A GM Authority poll revealed 75% of readers believe the GM lifter issue is more widespread than it appears.

There has not been an official recall for this part.

 

 

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