This bulletin applies to 2017-2018 Mazda3 vehicles.
Some customers who drive at elevations higher than 3,300 feet may complain of a shift shock felt when shifting into 3rd, 5th and/or reverse, with no AT related DTCs stored. The symptom can be temporarily repaired using the AT initial learning procedure, but may recur after multiple driving cycles.
Shifting from 2-3 or 4-3 is more likely to be felt due to the gear ratio. Improper control logic of the TCM may cause improper learning of R-3-5 brake engaging speed when the vehicle is driven at high elevations. To correct this issue, the control logic of the TCM has been modified.
Using IDS 109.02 or later software, reprogram the TCM to the latest calibration. Tip: when dealing with stop/start button vehicles, do not press the start/stop button during the reprogramming process.
CALIBRATION INFORMATION
Vehicle Engine New file name
Mazda3...............2.0L ...............PS7S-21PS1-C
Mazda3...............2.5L ...............PYKE-21PS1-B
