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does anyone know much on this TCM issues with mazda3 2.3l automatic when the AT light comes on and the car does not run at full speed, and won't shift gears.
And if so where and how did you fix this problem?
 

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Demon Spawn
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that's a very vague description, tranny code? any lights on other than AT light? what diagnostic codes do you get?
 

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I know that some cars have had the problem. I bought an 08 3s recently with 107k miles. The previous owner had the TCM replaced at a dealer for $1000.00! Now that I own the car and have been working on it I can say it’s an easy repair. Remove the battery and tray and it’s right there.
 

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I had these symptoms and replaced my TCM with a refurb from a guy on eBay in California. Complete success, and a pretty easy repair. I figured the $250 I spent on that was a good bet to fix the problem, but in the event something else was the culprit it was also a good signal to a tranny shop that they shouldn’t try to bluff me with a wholesale transmission replacement.
 
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