I have a 2012 Mazda 5 Touring. I am having problems with the transmission. My wife was going to work and it just went haywire. So i sent the TCM and had it rebuilt. Got it back and I'm still facing problems. The AT light comes on and goes off after about 5 secs. It only comes on when driving. So trying to get a code read on it is not working. I have done as the company said that rebuilt the TCM unplug the battery and connect the two battery cables together for about 30 minutes to do a complete power dump on all systems. The fluid looks to be good no burnt smell. Showing that the fluid level is good. I checked it after i have driven it 5-10 miles. From 1st to 2nd gear the rpm go high between 4 and 5 thousand (does not happen every time). The rest of the gears shift fine. Reverse This is where the major problem is. When it does go into reverse as soon as i touch the gas it slips out of reverse. If i dont touch the gas it stays in reverse. Has anyone else had this problem. If so what was your fix.

 

I have a 2009 Mazda5. So far, and i'm grateful, I have had no transmission problems. My car has 134K on it. Please keep us all posted and good luck luck.