Mazda3 TCM Limp mode…Any insight?

[scooterbob71]

I haven't been on this forum in ages and I know there are posts about the Mazda 3 TCM.
I have a solenoid A, mostly, coming up. Solenoid B cropped up a couple of times.
I sent my TCM to one of the repair places they said it was bad "fixed" it and sent it back to me. Same issue when I tried it. Called them and long story short they had me send it back to them again. They "fixed" it again? Never told me what they found bad in it? I got it back same issue. The place refunded 75% of my $ back because I questioned their fix?
Can a dealership test a TCM to see if it's bad? From everything I've read it has to be the TCM.
Anybody have a known good one to sell?
Junk yards want a mint for them without knowing if they are any good.
Just looking for some supportive insight.

 

[negusm]

Why do you think the TCM is bad? It may be telling you the truth. Solenoids probably need replacing.

 

[GTXT23]

I haven't been on this forum in ages and I know there are posts about the Mazda 3 TCM.
I have a solenoid A, mostly, coming up. Solenoid B cropped up a couple of times.
I sent my TCM to one of the repair places they said it was bad "fixed" it and sent it back to me. Same issue when I tried it. Called them and long story short they had me send it back to them again. They "fixed" it again? Never told me what they found bad in it? I got it back same issue. The place refunded 75% of my $ back because I questioned their fix?
Can a dealership test a TCM to see if it's bad? From everything I've read it has to be the TCM.
Anybody have a known good one to sell?
Junk yards want a mint for them without knowing if they are any good.
Just looking for some supportive insight.

Well _ I have a 2010 Mazda 3 GT 2.5 - with automatic trans - It was a few years back around 110K miles and the gear indication lights on the dash were lit up as M manual - D rive -and Check Engine light -- anyway I read the symptoms and could drive it but it was rough and needed to manually gear up and down so I drove it once and tried to stay in 3rd gear - I then sourced a OE new TCM then ( 2019 ) about $500.
It was easy to locate under the battery , which I removed and a few other things _ historically they were to close to the exhaust mani and heated up -- thus it was moved off the firewall down to the frame area- It was like the kids game operation getting all three junctions disconnected and a few new tools to get the screws out - Put it all together - and 50K later still driving like new ?
No guarantees obviously -- but with mileage a factor - I knew I was keeping this car as the 2.5s of 2010-11 easily run 300K - without issues ---so if you are keeping it -- Im a go OE always person but hey - we all have different budgets -- I can say I would not want to dig it out again after using one thats not solid -- but best of luck -