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Got a code P0729 for my 2007 Mazda 6? 6th gear problem. What to do next?

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PO729 code incorrect 6th gear ratio

Vehicle: 2007 Mazda 6, 6 cylinder

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P0729 Gear 6 incorrect gear ratio detected.

Where there any code that accompanied this? If this code is by itself here is the list of probable cause .ATF fluid, if its low or degraded ,or even the wrong type of ATF fluid.,VSS (vehicle speed sensor),Shift solenoid,line pressure control,transmission oil pump,TCM,

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