FWIW, I installed it and it works. Fingers crossed it will continue to do so.

 

After a 4 miles test drive and parking it over night, the lights came back on with U0101 again and same shift issues. 4 more miles later the AT code went off and it shifted fine again.

Same thing next 3 trips.

 

Is it still playing up having the same issue with mine

 

Also was yours auto or manual what was the part number you had on the side of the TCM mine seems to be fitted with the 2.0 litre model

 

Mine is the 2.5L with AT (2010) PN L539-18-9E1F. As I understand it, the last letter is a rev change. It's the rest of the PN that is critical to match. FWIW, G7 Computers did send me a full refund today (he also offered to take other look at it). I offered to let him keep his shipping expense, so he didn't actually lose money, but he sent the entire thing. Hopefully, the new TCM will take care of it.

 

So there is a way to test the presumed faulty TCM once it's removed ?? , where is G7 located

 

I used G7 and had the exact same thing and same report. They stated we did not need to open it up. I was like hmmm. Anyhow it worked for less than a mile. They eventually refunded my money after some discussion. I got a brandy new one from my local dealer, but had to order online for a much better price.

 

If you look at Mazda dealers online you can get a brandy new one for ~500 bucks. Not free, but not horrible. If you drive the car for another month, you will be even figuring car payments are 400+/month depending on many factors. At this point in your cars life, it will probably outlast the car. Just something to think about.

I got a new one from Jake Sweeney Mazda, he is local to me, but I had to order online to get the "good" price. Plug and play.

G7 guys can't seem to get it done in my experience, of course, others may have gotten theirs fixed just fine.

 

benniboo87, in case you don't realize it, you responded to a thread started by someone with TCM issues who has a 2010 2.5L. You didn't say what year and model you have, so one would assume you have the same. But, perhaps not. You should clarify what you have.

If that is a photo of your TCM, It seems you may have a 2010 or 2011 Mazda 3 2.0L based on this:

2010-2011 Mazda 3 Automatic Transmission Control Module LF8M-18-9E1H | TascaParts.com

2010-2011 Mazda 3 part # LF8M-18-9E1H - Automatic Transmission Control Module

www.tascaparts.com

That link shows compatibility with 2010 and 2011 2.0L. The latest revision if G. I'd look at wrecked Mazda 3 2.0L and find a LF8M-18-9E1F or LF8M-18-9E1G from a donor or buy a new one from Mazda.