21-043-17

Flash: Transmission Diagnostic and Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one of the following Diagnostic Trouble Codes (DTCs) have been set:U1412 - Implausible Vehicle Speed Signal Received. P0887 - TCM Power Control Circuit High. U0001 - Automatic Gearbox Shifter Module (AGSM) CAN Communication BUS (BUS Off). P0901 - Clutch 1 Actuator Control Circuit Performance. In addition, the following software enhancement is available:Changes which allow the catalytic convertor to operate cooler.