My 2010 Mazda 3 was having some minor troubles with gear changes and after running my OB2 scanner I found that it was showing numerous transmission faults. it turns out that Mazda in their infinite wisdom decided to mount the TCM ( Transmission Control Module) right on top of the hot gearbox and directly under the battery box. This over times causes the TCM to get overheated and fail. There are companies rebuilding the TCM control boxes but the cost of repair is extremely expensive, so I opted for a second hand module, and promptly relocated it so it cant happen again.
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It’s crazy I think I’m having a tcm issue because my at light is active, however, my engine code is giving a p0720, which I’ve replaced and it went away for a few weeks, but it came back with the at light
How long did that tcm work after relocating it there? I put mine in the lines like they said and it worked for a year and is out again
Hi, can I ask where you purchased the replacement TCM from? do you recommend the brand new one or do you think refurbished ones are okay? thank you so much if you reply to this comment
I having problem with SP25 2009 P0720 code. I swapped out VSS sensor with new one and it still randomly cause P0720 code wonder if my TCM is cooked.
for the tcm if I buy a used one from a car in a junkyard or something do I need it reprogrammed to my car or I just grab it connect it and good to go
Was your AT light coming on all the time or just on for a minute then off again?
That last bolt under the engine counter weight was a fricking nightmare haha
Same thing happened to wife's 2012 Mazda 3. So lame that they put that module right between those two heat-traps, combined with Australia hot summers, no wonder they go dead so fast. These units are so expensive on the used market too, and refurbished ones are like $1,000! Mazda dealer wanted to charge $2,000 for a new one!
thank you my mazda 5 2008 has a similar issue i am hoping its not the TCM praying . will carry out a diagnosis thank you