This bulletin applies to 2020-2023 Subaru Legacy & Outback 2.5L, 2017-2022 Forester and 2023 BRZ vehicles. Reprogramming files for the ECM to address rare cases of the engine surging/jolting when releasing the accelerator from half throttle. DTCs P0011 (A camshaft position – timing over-advanced or system performance bank 1) and P0021 (B camshaft position – timing over advanced or system performance bank 2) may be stored in the ECM when this occurs. New files are available which contain enhanced logic to optimize fuel trim, providing stabilized combustion during EGR valve operation.