TSB 21-2147

Some 2019-2021 Ranger vehicles may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0300, P0301, P0302, P0303, P0304 and/or P0316 stored in the powertrain control module (PCM). This may be due to water build up in the spark plug well(s) which can lead to signs of corrosion on ignition system components. To correct the condition, follow the Service Procedure to resolve the source of all DTCs and to install an engine appearance cover.