Some Buick Enclave owners report experiencing transmission failure as early as 17,641 miles, highlighting the importance of addressing the issue promptly, especially if the vehicle is still under warranty. Transmission problems are not uncommon, with many owners noting issues around 99,000 miles. Early model years, particularly from 2008 to 2009, have been associated with frequent failures due to a weak wave plate that can damage other vital components. If the vehicle is under warranty, owners may find that the transmission-related problem is covered, potentially saving on significant repair costs. It is advisable for owners to verify the warranty terms to determine if transmission failures are included in the coverage. Additionally, some owners have found that using additives can help mitigate minor transmission issues and enhance overall performance, possibly extending the transmission's lifespan. For those facing transmission failure, contacting the dealership or manufacturer is recommended to explore repair or replacement options under the warranty.