TCM software upgrade to improve shift quality on Suzuki Verona

Problem Description and Possible Solution

Poor shift quality of the automatic transmission may be improved by upgrading the software in the transmission control module (TCM).

Problem Data
RepairPal Verified
Average mileage: 107,555 (67,320–180,000)
2 model years affected: 2004, 2006
10 people reported this problem
Viewing 1 - 2 of 2 comments
That transmission don work good sometimes
Shifting hard all the park drive reverse neutral little up as one when in drive should be showing drive then there's no drive.. Was told it's the tcm where do I find this part?