Flash: Transmission Shift And Drivability 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. Upon further investigation the technician may find one or more of the following
Diagnostic Trouble Codes (DTCs):
· **P061B-00 - Internal Control Module Torque Calculation Performance.
· P072F-00 - Stuck In Gear 4.**
· P0711 - Transmission Fluid Temperature Sensor A Circuit Range-Performance.
· P1DAD - Input Shaft-Output Shaft Direction Correlation.
· P1CC9 - Unable to Engage Gear.
· P1D98 - Incorrect Gear Ratio Clutch B or D Defective.
· U1424 - Implausible Engine Torque Signal Received.
In addition to correcting the DTCs listed this software update includes the following
enhancements:
· **Coast down bump on 7-6, 6-5, 5-4, 5-3 downshift improvements.
· Cold 1-2, 2-3 upshift improvements.
· 1-2, 2-3 upshift flare control improvements.
· Power-on upshift improvements.
· Lift foot upshift 2-3, 4-5, 8-9 improvements.**
· Garage shift improvements (Shifting from Park or Neutral to Drive or Reverse).
· 1-2 Shift Quality improvements.
· Improved engine performance under certain operating conditions (High Altitude,
High Ambient Temperatures and High Humidity).
· Hill shift pattern optimization.
· Improved redline shift performance.
· Improved upshifts, downshifts, coast down shifts and tip shifts.
