Two problems related to transmission failure have been reported for the 2006 Mazda MAZDA6. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Mazda MAZDA6 based on all problems reported for the 2006 MAZDA6.
My transmission fails and revs high when I accelerate too hard or am going up a hill causing a downshift. This is most common when switching between the 5th and 6th gears. This is a very dangerous problem common in many vehicles of this model year. If I suddenly can't accelerate going 60 mph on the highway and drop down to 40mph as I wait for the rpms to go back down, there is a serious risk of being rear ended or side swiped depending on the situation. There is a service bulletin but it should be a recall. The fix would cost thousands of dollars.
When accelerating, the car suddenly has no power, then shifts hard down, typically it happens shifting into 3rd or 4th gear. Under about a half pedal, it basically feels like a stall, then jerks you backwards, hard as it kicks into gear and accelerates. I'm told there is a service bulletin that there are transmission failures for this car. Unfortunately, we are out of warranty.