Replacement of the Transmission Control Module (TCM) in my 2008 Mazda Mazda3 hatchback, with the 2.3 liter engine and the 5 speed automatic transmission. This process may work/be the same for earlier years of the same generation.
This replacement fixed the hard shifting and limp mode symptoms I was experiencing in addition to the solenoid codes, despite the solenoids having been changed twice just prior.
Follow along at your own risk! I am not a certified mechanic and not providing bolt torque values or anything of the sort, just recording my experience.
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Advice for me, anyone? I'm had the exact same issue with CEL and AT lights,
hard shifting into reverse, limp mode, etc. Also have fault code:
U0101. This has happened a few times, and when I restart the car it often fixes itself.
I figure the TCM needs to be replaced, but I'm also experiencing
slipping when I accelerate. The RPMs rev high, but I don't accelerate until I let off the gas and then the gear engages and I accelerate slowly.
Could this be due to the faulty TCM, or does it sound like my tranny is also failing?
Any advice would be appreciated. Thanks.
What are some of the signs and symptoms that would require you to replace the TCM?
Hello ,
I have a mazda 3 2004 2.4. i can't go pass 4th gear but i am able to reach 60-80 mph but only in slap shift. If i got on automatic it stays in 1st gear, does not move and the rpms go up like it's stuck on neutral. I have changed the speed sensor and the solenoids a and b and nothing has worked for me. I have wasted enough money as it is and i am looking to see if you can help me. do you think if i spend the 400 dollar's for this part would it fix my problem?
Thank you for this video
Really appreciate the video. Saved me a ton of money.
Thanks for the post, it solved my issue. I ended up leaving the old one in place and making a bracket that I secured to the metal break lines that run along the firewall. I put the new one there. My thinking was the old one probably went bad due to heat from the transaxle . I have since decided it bugs me and the new one will last longer than I own the car. I will change it soon.
After I change the TCM is necessarily reprogram the PCM in the dealer ?
P0753 Soleniod "A" electrical code is cleared permanently by replacing the TCM. it bugged me for almost two month! I've tried so many things to no change until i saw this video. Bought a brand new L34T-18-9E1E for my 07 Mazda 3 GT 2.3 AT. Mounted it on those break lines instead of the top of transmission to avoid the overheating issue. it's been couple of weeks without any issue, car runs super smooth and quite. never thought the new TCM would boost the performance that much. thanks a lot Spcorbust for your amazing video!
Was one of the symptoms before changing the TCM : the car shakes really hard when you put it in reverse ?
Thanks for this. I diagnosed the problem on my son's Mazda 3, 2.3 from the internet as the TCM. Ordered a genuine replacement from Quirkparts, at a pricey $468 (still the cheapest new one I found). He's 20 and was able to put it in himself, with an assist from Dad. Worked like a charm and saved us $6-700. Luckily, Murphy and his Law stayed out of the repair process…..
for some people that the transmission moudle didnt fix thier problem.
here is the solution
go ahead and change the power train control moudle thats underneath the passenger seat.
2008 Mazda5 2.3 here throwing code U0101. Just wanted to add some theory as to WHY the Transmission Control Module (TCM) fails. I cannot find the Mazda247 thread, but someone gave some insight saying maybe the reason the TCMs have different part numbers as spcorbust pointed out: 9E1B to 9E1E, is due to Mazda providing better solder points/parts inside the TCM. 9E1B is actually not the ORIGINAL TCM believe it or not, the original is "9E1". As time went further, Mazda had to keep revising the TCM and 9E1E is the most current TCM to purchase. Just a theory, but sounds extremely logical. My advice: DO NOT purchase 9E1B, 9E1C, or 9E1D. ONLY purchase 9E1E. Some websites offer remanufacturing of your original TCM to 9E1E standards and a 1 year warranty, although do not explicitly say they will be made to 9E1E standards. Either way, this is not a cheap solution. I hope this info is helpful to many of you!
I'm planning on replacing my TCM using this great video. I do have a question. Did you have to get your TCM reprogrammed by the dealer? Or did you just install as is. I called my dealer, he said it's around $650 for the part, plus I'll have to get it reprogrammed.
Yeeeee you saved me $700. took me an hour and a half. got the same gash on my finger trying to unscrew everything. it was a annoying as hell but pretty simple. great job on the video my man!
I can't find my tcm at all its not in the spot where yours is. I need help
I can't find my tcm at all its not in the spot where yours is. I need help
I can't find my tcm at all its not in the spot where yours is. I need help
is the transmission control module the same as a control module????
i did this job a while ago and the transmission problem is fixed 🙂
Hoping to solve the issues I've had with my 07 Mazda 3 automatic. I had issues with the AT light coming on, it won't go under 2 on the gear shift (even when I'm in park still says 2) and it won't go over 4. I brought it to a transmission shop and they told me I had to replace the whole transmission.. which I was very dumb to do. The next day when I get my car back the AT light pops back on, and the car is jerking so I bring it back and he decides that it's the transmission module so he replaces that with a used one and it still came back on. Is this what happened to you guys? The AT light and the jerking when stopping/reversing and staying in gear 2. The shop isn't willing to do anything about it (despite the money they made me waste). Any advice?
Thank you for your video!