Autel MaxiSys MS908S used for observation: When cruising in Drive (e.g., D3) and you flick to manual, the cluster freezes on the last D gear (e.g., still shows D3) although the gearbox mechanically shifts.
Upshift manually (feel 4th engage) and note that reverse, automatic, and manual selections are otherwise smooth. Only the display logic is incorrect.
Assume a coding mismatch after dealer software update, not a failed TCM. Avoid unnecessary module replacement.
Log TCM software ID (0C9…750 M), hardware index (A / HW10), and original coding 01020—no DTCs but faulty manual gear indication.
With the Autel MaxiSys MS908S diagnostic tablet, alter one block at a time: 00120 or 01010 (spoken 0101) produces ECM/TCM incompatibility DTCs. Document each failed attempt.
Set coding to 000020. Clear faults; confirm no incompatibility returns.
Enter manual: “D” disappears; only the live gear number remains. Upshift/downshift; cluster updates instantly and auto downshifts display correctly.
Cycle between manual and Drive; stability confirmed, no new DTCs—issue solved efficiently with MaxiSys MS908S Pro II professional scan tool.
