The steering rack problems on the Buick LaCrosse and Enclave models, especially in the 2020-2021 range, stem primarily from issues with the electric power steering systems. Common issues include loss of power steering assist and warning messages such as "Service Power Steering" and "Steering Assist Reduced." These problems are often traced to electrical component interference within the power steering gear assembly. Specifically, unintended grounding can occur, leading to damage to internal electrical components, which compromises steering performance and results in error codes such as C0460 and C0545 being set in the power steering control module.
General Motors issued Technical Service Bulletin 20-NA-215 in 2021, addressing these issues for affected vehicles, including the Buick Enclave, advising technicians to replace the electric belt-drive rack and pinion steering gear assembly. This service bulletin highlights that steering failures may be accompanied by the loss of other systems, like StabiliTrak and lane keep assist, due to the interconnected electronic systems in the vehicle.
For more detailed information and specific bulletins related to these issues, websites like Car Problem Zoo and Enclave Forum provide information including service bulletins and user complaints about steering issues in these models.
Sources Car Problem Zoo
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