T-SB-0156-19

TSB: Some 2017 ? 2020 model year 86 vehicles with automatic transmissions may exhibit one or both of the following conditions: ? MIL ON condition with Diagnostic Trouble Code (DTC) P0300. ? rough idle at cold start noticeable when engine coolant temperature is around 50°F (10°C). Follow the Repair Procedure in this bulletin to address this condition.