A harsh downshift from the automatic transmission my be noted on deceleration. Updating the transmission control module (TCM) software may correct this concern. Software revisions are commonly most helpful on newer vehicles. once the mileage builds up a worn component could cause similar problems. Whenever major transmission work in performed, the transmission software should be updated as necessary.
Harsh Downshift on Deceleration on Suzuki Grand Vitara
Average mileage: 151,000 (151,000–151,000)
1 model year affected: 2006
2 people reported this problem
2006 Suzuki Grand Vitara 151,000 mi, Visitor
Engine just started jerking when downshifting (automatic)at around 50-55 MPH.