A no-start condition related to the Auto Stop feature of certain 2023 to 2024 GMC Sierra, 2021 through 2024 GMC Yukon, and 2021 through 2024 GMC Yukon XL units sold in California and equipped with turbodiesels engines now has an available fix, per a bulletin released by GM.
The General has issued Service Update number N242441450, which instructs dealers to apply the fix to GMC Sierra and GMC Yukon units brought to the dealership by customers, or still in dealer inventory.
Affected GMC Sierra units are motivated by the 3.0L I6 LZ0 turbodiesel Duramax developing 305 horsepower and 495 pound-feet of torque. Meanwhile, affected GMC Yukon SUVs are powered by the 3.0L I6 LM2 turbodiesel Duramax engine providing 277 horsepower at 3,750 rpm and 460 pound-feet of torque at 1,500 rpm.
The issue causes the Auto Stop feature of the GMC Sierra and Yukon units to malfunction. This feature causes the vehicle to switch off the engine when it comes to a full stop, such as waiting at a stoplight, then restart it when the brake pedal is released. With this condition, the engine will not restart from time to time.
The fix is available at no cost through the end of the New Vehicle Limited Warranty period. Affected units in dealer inventory cannot be sold, demonstrated, traded, or delivered by the dealership until the fix has been applied. The precise number of vehicles involved is not known, though involvement should be verified in the GM Global Warranty Management system.
Applying the fix requires no additional parts or components. Dealership service personnel are to correctly reprogram the Engine Control Module (ECM), a task requiring approximately 24 minutes per GM estimates.
Under the body panels, the GMC Sierra 1500 is underpinned by the GM T1 platform, a platform it shares with its corporate twin the 2024 Chevy Silverado 1500. Production of the pickup takes place both at the GM Fort Wayne plant in Indiana and the GM Silao plant in Mexico.
Meanwhile, the GMC Yukon also makes use of the GM T1 platform for structure, while it is produced at the GM Arlington Assembly plant in Texas.
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Comment
is this just for California vehicles or is this a problem that could affect 2021 Yukon’s with 3.0 Duramax sold in other states as well….and if not what’s different in other states….mine was purchased new in New York State….like to know BEFORE my power train warranty expires….