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Hi I have a 2012 mazda 3 2.5L engine with 59000 miles car is at dealership for 2 weeks now issue is when we are driving AT suddenly comes on for just a second and transmission shifts down to 3rd then it goes back to normal once it did it on highway at 65 it downshifted to 3rd and AT come on then it went back to normal dealer says that can’t pull any codes when they drive it they take it back to shop and pull codes and nothing comes back dealer says there 90 percent sure it’s the TCM but can’t gurranteed it any advice
 
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