21-021-15 REV-D

Flash: Transmission Diagnostic And Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination and/or one of the following conditions. Upon further investigation, a technician may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the TCM memory. 2015 KL Vehicles ? When driving on grades, the 3-2 downshift is hard to achieve or not available (ED6). ? P0711-00 - Transmission Fluid Temperature Sensor A Circuit Range-Performance (ED6). ? P0887-00 - TCM Power Control Circuit High. ? U0401-00 - Implausible Data Received From ECM/PCM. ? P1DAD - Input Shaft-Output Shaft Direction Correlation. 2015 UF Vehicles ? P1634-00 - TCM Internal Watchdog Performance (ERB). ? Garage shift improvements. Any shifting combination into or out of, Park, Drive, Reverse or Neutral (shifting at little or no vehicle speed). ? Up shift improvements, 2-3, 3-4 or 4-5 (ERB). ? P0711-00 - Transmission Fluid Temperature Sensor A Circuit Range-Performance. ? P0887-00 - TCM Power Control Circuit High. ? U0401-00 - Implausible Data Received From ECM/PCM. ? P1DAD - Input Shaft-Output Shaft Direction Correlation. This TCM calibration update being released also enables the new wiTECH based ?Transmission Quick Learn? procedure to be performed anytime the transmission adaptation memory cells are cleared or when addressing customer concerns of poor shift quality. It is also being released to improve transmission downshift response time during normal driving.