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GM updates 2025 GMC Sierra EV rear control arm torque spec

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GM issues a service update for 2025 GMC Sierra EV pickups: align rear wheels, then torque rear lower control arm bolts to 369 lb-ft (500 Nm) safely.
Michael Powers, Editor

General Motors has issued a new service update concerning the rear lower control arms on certain GMC Sierra EV pickups. The notice stems from an incorrect torque specification for four bolts in the rear suspension. If left unaddressed, the issue could ultimately affect suspension performance and the alignment of the rear wheels.

The update applies solely to 2025-model-year Sierra EV trucks. To resolve the rear-suspension concern, GM advises dealers to set the rear wheel alignment first, then torque all four rear lower control arm bolts to 369 lb-ft (500 Nm). The sequence underscores the aim of locking in the correct geometry before final tightening.

The guidance covers customer-owned vehicles as well as dealer inventory, including new, used, certified pre-owned, courtesy transportation, and demonstrator models. GM says vehicles subject to the update should not be delivered to customers until the work is complete. It’s a straightforward procedure, but an important one for keeping the truck’s rear end tracking true.