Yukon Duramax Owner Quoted $5,300 as GM Valve Coverage Lists His SUV
A 2021 Yukon Denali Duramax owner was quoted $5,300, though GM special coverage N252508341 lists his SUV for the coolant valve. What the program covers.
A 2021 GMC Yukon Denali owner with the 3.0L Duramax diesel says his dealer quoted $5,300 to replace a coolant valve and a leaking high pressure fuel pump, and told him the valve was not covered. GM Special Coverage N252508341 lists the 2021 to 2023 Yukon with the 3.0L LM2 Duramax for that same valve, Torque News reported, which would leave the $4,300 fuel pump job as the main cost.
The owner, Tim DeVries, posted the quote in a Facebook group for 3.0 Duramax owners. He also wrote that his Yukon has spent 285 days at the dealership since he bought it and that he regrets not pursuing a lemon law claim. Torque News said it had not seen his repair orders, VIN or mileage.
What GM’s coolant valve coverage includes
According to Torque News, the special coverage program applies to the coolant control valve on vehicles with the first generation 3.0L LM2 Duramax. A faulty valve can fail a diagnostic test and turn on the check engine light.
- Covered models: 2021 to 2023 GMC Yukon, Cadillac Escalade, Chevrolet Tahoe and Suburban, plus 2021 to 2022 Silverado 1500 and Sierra 1500
- Coverage length: 15 years or 150,000 miles from the original in service date
- Cost to the owner: no charge on qualifying vehicles
- Reimbursement deadline for owners who already paid: October 31, 2026, unless state law allows longer
The bulletin requires each vehicle to be confirmed in GM’s warranty system before the repair, Torque News said, and that check may explain why the dealer gave DeVries a different answer. He said he was told the valve was “not covered on the bulletin due to engine model.”
Why the fuel pump repair costs $4,300
The dealer told DeVries the pump job would take 22 hours of labor. A commenter in the group, Nick Baker, wrote that the service procedure calls for removing the transmission to reach the injection pump, because the pump is driven off a gear in the timing drive at the back of the engine. The Torque News writer, who described himself as a former ASE certified technician, said that rear timing layout is what drives the labor time on the LM2.
Another owner in the thread, Derek Steele, said a leaking pump on his vehicle contaminated the fuel system and led to a $12,000 dealer repair.
What it means for 3.0L Duramax owners
Owners of the listed SUVs and pickups who are quoted for a coolant control valve may be covered at no cost if their VIN qualifies in GM’s system. Anyone who paid for the valve out of pocket faced the Oct. 31, 2026, reimbursement deadline, with longer periods possible under some state laws. The fuel pump is outside this program, and on the LM2 that repair carries heavy labor because of where the pump sits.
DeVries’ complaint about time at the dealer touches a separate issue. Torque News noted that in many states lemon law protection applies only during early ownership or the warranty period, so the window can close while repair days keep adding up.
Other owners report mixed experiences
Replies to the post split. Dan Weber described a 2021 Duramax with DEF problems, glow plug failures, injector harness issues and its own high pressure fuel pump repair. Jim Rutledge said his 2023 had covered 90,000 trouble free miles.
Torque News has also reported on a 2025 Sierra AT4 whose 3.0 Duramax failed at 4,600 miles and a 2025 Silverado Duramax that failed at 5,000 miles and waited on a national back order for parts. Some owners in those reports switched to a Ford F-150 or a Ram 1500. The outlet cautioned that social media posts can make a problem look more widespread than it is.
Source: Torque News
