GM has updated their service bulletin regarding valve rocker arm debris to include the 2.0 liter LSY engine that is found in all 2025 and 2026 Buick Envisions. The previous version of the bulletin only listed the 2025/2026 Enclave with the 2.5 LK0 engine. As previously mentioned, the debris causes certain engine parts to not get sufficient oiling, resulting in metal-on-metal contact and the “ticking sound” mentioned by GM.
Source: https://static.nhtsa.gov/odi/tsbs/2026/MC-11029264-0001.pdf