This bulletin applies to 2017 Maxda6 vehicles produced before April 2, 2018, and 2018 CX-3 vehicles built before Feb. 6, 2018.

Some customers who drive at elevations higher than 3,300 feet may complain of a shift shock felt when shifting into third, fifth 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. Applicable situations include shifting up 2-3 or 4-5 and shifting down 4-3 or 6-5, and D-R, N-R or P-R.

After verifying the concern, using IDS 109.02 or later software, reprogram the TCM to the latest calibration. New calibration file names are as follows:

Mazda6 without i-ELOOP...................PYJN-21PS1-B

Mazda6 with i-ELOOP........................PYJR-21PS1-B

CX-3 with 2WD..................................PSGC-21PS1-B

CX-3 with 4WD..................................PSGD-21PS1-B