Update Toyota BECM Calibration
Some 2017 Toyota Prius Prime vehicles may exhibit a MIL on with DTC P0A1F94 (battery energy control module [BECM] unexpected operation) when the ignition switch is on and the vehicle is in “ready ff” status for at least 5 minutes.
Note: The BECM should not be replaced for this concern. Reprogramming to the latest available calibration is required. Use Techstream to confirm if the BECM calibration has been updated.