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Mine is currently at Mazda dealership waiting for TCM part to arrive. Thankful that I bought the maxcare service plan when I purchased vehicle from Carmax, whole repair will cost me only $50, that includes loaner vehicle.
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Good you got it fixed drive like that will muss it up your car only as good as you treat it
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Breno67
Hi there,
My 2007 Mazda 3 SP23 jumped into 3rd and AT light came on. Took it to transmission guy who advised that everything mechanically and wiring etc was okay and concluded it could only be the computer. I agreed to put a second hand one in as he couldnt give me a guarantee this would fix it. All up for this and his work i paid $AU1300. The problem came back almost immediately although this time it would come and go whereas previously it was stuck with AT fault. So the change of TCM had made some kind of difference. I took it to Mazda who went over everything and came up with same conclusion that it could only be the TCM which would be around $1800 brand new. After a few months of the car mostly driving fine albeit the engine warning light stayed on but no AT fault, or when it did come on it would reset okay, it has now gone back to the fault being there full time. So i now have the dilema of whether to go with a new TCM as the car is useless otherwise. My nagging doubt is that the second hand TCM never worked. Did i just get burned with the second hand one not being good enough and new one will work okay? Would appreciate any feedback/advice from anyone who has experienced a problem with a second hand TCM. |
Did you ever find out what the problem was, as my 2007 Mazda 3 is now acting the same I'd be in 5th and it throws it down to 4th with at light coming on?
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Mazda People,
If you are having these issues with CEL+AT light and auto trans dropping to 3rd with solenoid error codes or Uxxx codes it is almost definitely the TCM (transmission control module). DO NOT pay thousands to the dealer for a transmission replacement. It will likely not help. I recently had same issue on my 2007 Mazda3. Dealer told me replace trans for $4k. I took car home to troubleshoot. Replaced TCM for $300 and problem solved! The Mazda TCMs are designed poorly. They mount directly to the transmission and electronics possibly suffer thermal damage from the trans housing. There are 5 versions now. Your car probably has L34T-18-9E1A. The newest rev is L34T-18-9E1E. The only difference is probably the software. They are very simple to replace yourself and save tons of money. Here’s what to do: 1) First go around your engine and check any electrical connections to make sure they are all seated properly, nothing loose, and no fuses blown. You may also want to check harness connectors to the ECU under the passenger floor. Also make sure all vehicle ground harness is tightly secured to the chassis. These are usually thick black cables bolted to the frame. It’s unlikely any of this is the problem but it’s the simplest thing to check first. 2) Buy a OBDII code reader. Something like this. 3) Read your error codes. 4) If you have any of these then replace your TCM. • Uxxx – network code loss of communication with TCM or ECU • P0753 – shift solenoid A malfunction • P0758 – shift solenoid B malfunction • P0763 – shift solenoid C malfunction 5) You can buy an improved refurbished TCM for $300 here. This is what I did. Or buy from Mazda part number L34T-18-9E1E. Dealers charge about $500+. 6) Install yourself like There are other less likely issues that can cause similar trans problems. If replacing TCM doesn’t solve your problem or you have different error codes than what I’ve listed then replace these sensors on top of your transmission. These are all located near the TCM: 1. Vehicle speed sensor, FN0121550 (also called speed pulse generator, transmission output shaft speed sensor) 2. Range Sensor, FN0221444 (also called auto trans gear position sensor, neutral safety switch) 3. Speedometer sensor, FN1221551A (also called vehicle speed sensor) If after all this if you still have a problem then you could consider replacing the actual shift solenoids in the transmission or the transmission itself as a last resort. Only at this point would I consider the transmission at fault. Good luck! |
Can't find tcm
hey I have a Mazda 3i 2007 base Mazda 3 well the tcm is not on top of the tranny does any of you guys know where it's located At??.. let me know please thank you
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Originally Posted by mazguy
(Post 423330)
Mazda People,
If you are having these issues with CEL+AT light and auto trans dropping to 3rd with solenoid error codes or Uxxx codes it is almost definitely the TCM (transmission control module). DO NOT pay thousands to the dealer for a transmission replacement. It will likely not help. I recently had same issue on my 2007 Mazda3. Dealer told me replace trans for $4k. I took car home to troubleshoot. Replaced TCM for $300 and problem solved! The Mazda TCMs are designed poorly. They mount directly to the transmission and electronics possibly suffer thermal damage from the trans housing. There are 5 versions now. Your car probably has L34T-18-9E1A. The newest rev is L34T-18-9E1E. The only difference is probably the software. They are very simple to replace yourself and save tons of money. Here’s what to do: 1) First go around your engine and check any electrical connections to make sure they are all seated properly, nothing loose, and no fuses blown. You may also want to check harness connectors to the ECU under the passenger floor. Also make sure all vehicle ground harness is tightly secured to the chassis. These are usually thick black cables bolted to the frame. It’s unlikely any of this is the problem but it’s the simplest thing to check first. 2) Buy a OBDII code reader. Something like this. 3) Read your error codes. 4) If you have any of these then replace your TCM. • Uxxx – network code loss of communication with TCM or ECU • P0753 – shift solenoid A malfunction • P0758 – shift solenoid B malfunction • P0763 – shift solenoid C malfunction 5) You can buy an improved refurbished TCM for $300 here. This is what I did. Or buy from Mazda part number L34T-18-9E1E. Dealers charge about $500+. 6) Install yourself like this. Or get a friend to help. There are other less likely issues that can cause similar trans problems. If replacing TCM doesn’t solve your problem or you have different error codes than what I’ve listed then replace these sensors on top of your transmission. These are all located near the TCM: 1. Vehicle speed sensor, FN0121550 (also called speed pulse generator, transmission output shaft speed sensor) 2. Range Sensor, FN0221444 (also called auto trans gear position sensor, neutral safety switch) 3. Speedometer sensor, FN1221551A (also called vehicle speed sensor) If after all this if you still have a problem then you could consider replacing the actual shift solenoids in the transmission or the transmission itself as a last resort. Only at this point would I consider the transmission at fault. Good luck! I replaced the TCM on my 2008 with 198K kms on the odometer - after checking various Mazda Forums on the internet. My friendly Kanata Mazda dealer wanted $5,200 Cndn. to replace the automatic transmission ? HUH? WTF? On top of that, it cost #129.95 for the diagnostic check which listed the CEL codes. My problem was eliminated with the purchase of a new L34T189E1E TCM for $550 Cndn. (...from a different Mazda dealer), and two hours of my time. This is obviously a long term reliability problem that has plagued various years and models of Mazda with automatic transmissions. Mazda should do the right thing, step up and issue a TSB to cover this huge long term reliability problem, instead of gouging loyal customers with expensive replacement parts, and allowing service techs to mis-diagnose simple transmission problems !:pat: For this reason alone, I will never own another Mazda product ! |
Where is the transmission control module located in a mazda3 2008 sportshatch. And its not under the battery.
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Originally Posted by Michael Tahitu'a
(Post 423717)
Where is the transmission control module located in a mazda3 2008 sportshatch. And its not under the battery.
Maybe check with a Mazda dealer? (. . . not sure about NZ 3s ?) |
This help:
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Hey guys, just some extra info that many of you may not be aware of concerning the infamous TCM (Transmission Control Module) failures.
If you have a Mazda 3 that is PZEV (Partial Zero Emission Vehicle) certified, then the TCM is a FREE warranty replaced item under the PZEV warranty for 15 years / 150,000 miles!! This applies to PZEV-certified cars currently registered in the following 9 states: California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Rhode Island or Vermont. You can determine if you have a PZEV car by the emissions label located under the hood. However, to absolutely confirm that your faulty TCM will be covered for FREE under the PZEV warranty, it is best to call the Mazda Customer Experience Center at 800-222-5500. They will ask for your VIN and confirm that your TCM is covered. Best to give them the TCM part # for a quicker response. The part # for all 2007-2009 Mazda 3s is L34T-18-9E1A (the last letter is the Revision and can be an A, B, C, D, or E. A Mazda warranty repair will require you to go to the Mazda dealer for the diagnosis and repair. You will have to pay for the initial diagnosis fee, but it will be waived if the TCM is determined to be faulty. So, if you have a PZEV-certified Mazda and you have determined that your TCM is faulty and you are in 1 of the 9 states noted above, you might want to have Mazda replace it for FREE vs. you buying a new one for $500+. Note the PZEV 15-yr/150k mile warranty applies to most all emission-related parts so be sure and check before spending your own $$ and DIY'ing any of these related parts. |
Originally Posted by Niel Daria
(Post 423563)
hey I have a Mazda 3i 2007 base Mazda 3 well the tcm is not on top of the tranny does any of you guys know where it's located At??.. let me know please thank you
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Originally Posted by Michael Tahitu'a
(Post 423717)
Where is the transmission control module located in a mazda3 2008 sportshatch. And its not under the battery.
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2010 MAZDA 3 AT/engine lights---wont shift past 3rd gear
2010 MAZDA 3........SAME PROBLEM AT/ENGINE LIGHT WONT SHIFT HIGHER THN 3RD GEAR , MY MECHANIC REPLACED SOLENOID "A" & SOLENOID "A" PRESSURE FLIUDS AND FILTER FOR $1200 STILL NOT FIXED.... IT WAS THE TRANSMISSION CONTROL MODULE...NEW$650....I GOT A REMANUFACTURED ON EBAY FROM MODULE REPAIR PRO FOR $250 IT WORKED FOR 2.5 WEEKS AND CAME BACK ON TODAY....IT HAS A ONE YEAR WARRANTY,I CALLED THEM THEY TOLD ME CHECK A COUPLE OF THINGS.....I CAN RETURN IT AND THEY WILL FIX OR REPLACE IT NO CHARGE....HAVE TO CHECK THE WIRING HARNESS TOMORROW....if no change shipping it back
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Do not mount the new tcm in its original location, zippy tie it to the brake lines on the fire wall, it will not be getting the heat from the tranny and will last o whole lot longer....
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Originally Posted by rivman
(Post 423615)
this is all good and accurate info from mazguy !
I replaced the tcm on my 2008 with 198k kms on the odometer - after checking various mazda forums on the internet. My friendly kanata mazda dealer wanted $5,200 cndn. To replace the automatic transmission ? Huh? Wtf? On top of that, it cost #129.95 for the diagnostic check which listed the cel codes. My problem was eliminated with the purchase of a new l34t189e1e tcm for $550 cndn. (...from a different mazda dealer), and two hours of my time. This is obviously a long term reliability problem that has plagued various years and models of mazda with automatic transmissions. Mazda should do the right thing, step up and issue a tsb to cover this huge long term reliability problem, instead of gouging loyal customers with expensive replacement parts, and allowing service techs to mis-diagnose simple transmission problems !:pat: For this reason alone, i will never own another mazda product ! |
TCM from www.promazdaparts.com
Has anyone in this forum used www.promazdaparts.com and how was your experience with them?
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Tcm
Originally Posted by Kathy Azare Rogers
(Post 424013)
Has anyone in this forum used www.promazdaparts.com and how was your experience with them?
Must have an overstock of these units that were not selling at the rather expensive inflated price ? |
Just had mine replaced in PA at 84,655 miles under warranty - only had to pay for the diagnostic report
Originally Posted by Theg
(Post 423889)
Hey guys, just some extra info that many of you may not be aware of concerning the infamous TCM (Transmission Control Module) failures.
If you have a Mazda 3 that is PZEV (Partial Zero Emission Vehicle) certified, then the TCM is a FREE warranty replaced item under the PZEV warranty for 15 years / 150,000 miles!! This applies to PZEV-certified cars currently registered in the following 9 states: California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Rhode Island or Vermont. You can determine if you have a PZEV car by the emissions label located under the hood. However, to absolutely confirm that your faulty TCM will be covered for FREE under the PZEV warranty, it is best to call the Mazda Customer Experience Center at 800-222-5500. They will ask for your VIN and confirm that your TCM is covered. Best to give them the TCM part # for a quicker response. The part # for all 2007-2009 Mazda 3s is L34T-18-9E1A (the last letter is the Revision and can be an A, B, C, D, or E. A Mazda warranty repair will require you to go to the Mazda dealer for the diagnosis and repair. You will have to pay for the initial diagnosis fee, but it will be waived if the TCM is determined to be faulty. So, if you have a PZEV-certified Mazda and you have determined that your TCM is faulty and you are in 1 of the 9 states noted above, you might want to have Mazda replace it for FREE vs. you buying a new one for $500+. Note the PZEV 15-yr/150k mile warranty applies to most all emission-related parts so be sure and check before spending your own $$ and DIY'ing any of these related parts. |
I want to say thanks to you and others on the forum on the diagnosis concerning the TCM. I was having the same problem (flashing AT light about every 5 minutes on a trip, random shifting even when in manual mode in my automatic transmission. In most cases, it suddenly shifted from 5th into 4th gear, but sometimes from 5th into 3rd with a jolt -- not fun at 65mph. Also, it sometimes shifted from 4th into 5th for no reason) with my 2012 Mazda5 with 59,000 miles, and it took me three places before resolution with the TCM. The first transmission place thought it might be the battery connection, and that was connected/reconnected and a flush and fill of tranny fluid for good measure. They did not find any codes. That didn't do anything.
Took it to the dealer, and they did not get any codes, but they were able to get the problem to happen to them while driving around. They adjusted the transmission fluid which was high, and they said it will be $4,961 for a new transmission, since it is probably a mechanical issue. We can get you in the next day for a new tranny. (Um, no. I don't think so. The AT light also sometimes comes on when the car is at a complete stop.) Took it to a different transmission place that had better google reviews. They first tried a new speed sensor, but that didn't do anything. No charge. Took it back to them after buying a new Mazda L5E4-18-9E1E Auto Trans Control Unit for the Mazda 5. They replaced it NO CHARGE since they could not guarantee 100% that that would fix the problem. I am going to give them an awesome review and continue going to them for trans needs in the future. (BTW, I also gave them 2 dozen donuts in the couple of times we took it there.) We have had it 1.5 days without a flashing AT light and no jolting downshifts. I am assuming the problem is fixed. Thanks guys and gals. Joe |
My madza 3 2007
hi today without any warning my madza made this noise and then wouldnt go anywhere.i have been driving alot and far but gave no warning at all everyone is saying might be transmission but couldnt it be something else I was driving on a very bumping road could something have bumped loose that would explain it it starts up and sounds fine but put in any gear and it wont go why ? I am working out of state so I had it towed to nearest repair shop I cant afford a big bill so please need urgent help any suggestions would be great ty
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Mazda 2007 AT light comes on error code P0778 ( should I replace TCM OR the solenoid?
Do anyone know where pressure control Solenoid B is located?
I have the same issue but error code is p0778 anything helps thanks Thank you very much
Originally Posted by Canso
(Post 417016)
There are pressure solenoids that maybe affecting the clutches, maybe not giving enough pressure to hold the clutch.
I cringed every time I saw your rpm go up, and the mph stay steady. It’s a pressure problem, but it can wipe out clutches quickly What codes came up? |
The Dreaded AT Light on 07 Mazda 3 2.3l
So I currently have an 07 Mazda 3 2 3l. A few months ago I started having issues, beginning with my battery going dead, engine code coming back as dead battery then alternator, then my coolant tank cracking, and my AT light coming on and the car kicking into safe mode (only driving in 3rd gear max). I swear I had nightmares at the thought of a transmission rebuild price. Fortunately I had an honest transmission shop tell me that with all the codes kicking back, and all the issues (oh yeah, I forgot that it was also giving a P0153 Solenoid code--- I may have that number wrong, but I do remember it was a solenoid code) that he highly recommended that I replace the TCM. He also said he recommended that I do it myself, because the part was considerably pricey but installing it was fairly easy. I even told him that I had absolutely ZERO experience with auto repair, and that when my coolant tank cracked I actually DUCT TAPED it as a temporary fix....he still advised me to do it myself as he would not feel comfortable charging anyone for such a simple fix. Luckily I know someone who could follow simple YouTube instructions, whom installed it for me. After TCM was installed, the issues disappeared. That was until (obviously I'm not here to tell you my experience from months ago for nothing) yesterday when that flabbergasted AT light came on AGAIN. My first reaction, contact the company I purchased TCM from (which happens to be a remanufactured piece from My Airbags.com ) as I purchased the part in September 2020, and is covered for a year. They recommended that I do a hard reset on the TCM....🤔 again, no experience here! That's like telling my 8 year old to do my taxes 🤯 like I know how to do a hard reset on the TCM, much less what that even means?!?! So I turn to Google, which leads me to posts about resetting a Mazda ECM, KPM and whatever other modules there are for every vehicle currently driven on Earth.
So, if you have made it this far in my post (thank you, I am a HUGE talker, if you haven't noticed 🤷♀️) how in the world do I reset the TCM, actually hard reset my TCM? For all you paragraph skimmers, how do I do a hard reset on my TCM? 🤣 AND...for all you mechanics, given all the details mentioned above, will a hard reset actually fix this issue? I honesty thought, since the part is remanufactured, that the part is actually defective. |
Originally Posted by ryanmtaylor77
(Post 416983)
Hello everyone,
This is a bit of a last resort and i am just trying to see if anyone else out there has had this problem or has a possible solution to what it may be. Here we go... I have a 2007 Mazda3 5 door 2.3L AT 5 speed with a little over 84k. I have had steelership do all oil changes and i did a trans oil/filter at 35k and 81k mi. last Sat., it started dropping from 5th to 3rd at highway speed. This was in "D". I tried putting it in manual and it limped the remaining 6 mi home without issue. Sunday was a different story, it did it in Manual and "D". Main offending gears were 3rd, 4th, and 5th in "D" and manual. Sunday night i changed the trans fluid again (5 quarts not a full flush). Fluid was a little dirty but not that bad. Just wanted to make sure it wasnt some filter issue. I took it out at about 130am after finishing (different long story behind that) and it did it almost immediately in the same gears and conditions, like less than 1000 ft of driving. I took streets on Monday and took it to the steelership on Tuesday at 830 AM. I explained that it does it always after it is at operating temp and sometimes then it is cold, the check enginge light was on, the DCS light comes on when it does it and stays on after the 2nd or 3rd time, and the light that shows what gear i am in disappears sometimes when it happens. Steelership said that it needed ECU update and had a loose harness at the cluster. This was Late Tuesday. On Wednesday they said they were finishing that up and there were some other repairs i had going on that were the a/c control and stereo. The parts would be 2 days so it would be ready friday (yesterday). So i pick it up Friday and everything processed. Checked the paperwork and it said that trans fluid was "dirty", odd after changing it on sun but ok. I get into the vehicle and the check engine light was on. I told them about it and he said the tech had forgotten to clear the code and if it stayed on they would clear/check it on mon/tues when i could come back in. So i drive home and no events. Check Engine light goes off as it should after 2 cycles with no code, and i go home. Next morning(today) i start it to warm it up and the check engine light and the DSC light are on. Again i get about 1/4 of a mile omw to drop kids off at parents before going to work and the trans starts doing it all over again. It has done it all day no matter where i go or how i drive it. I am not hard on this vehicle and have 2 questions(thanks for bearing with me): 1. When you update the ECU does that remove the engine codes, like totally re-write the memory? I ask because if it does, then the code happened again after they flashed it, or they never really did anything. 2. WHAT COULD BE WRONG HERE?????? Thanks in advanced for your advice. PS i will try and post a little video of what it was doing I did a lot of searching around, dealers are getting up to $680 for a new one. I'm in an auto related business and even the jobber price was $560. I've seen them new for as low as $499 online. However, there's rebuilder in GA that sells them for $199, so this is what I went with UpFix.com Instructions included in the box show a diagram recommending that you wire-tie it to the brake lines so it no longer absorbs heat from the transmission. The heat is what kills them. They also include a small flat-rate box and address label for the core return. Shipping was super fast too. |
Originally Posted by Theg
(Post 423889)
Hey guys, just some extra info that many of you may not be aware of concerning the infamous TCM (Transmission Control Module) failures.
If you have a Mazda 3 that is PZEV (Partial Zero Emission Vehicle) certified, then the TCM is a FREE warranty replaced item under the PZEV warranty for 15 years / 150,000 miles!! This applies to PZEV-certified cars currently registered in the following 9 states: California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Rhode Island or Vermont. You can determine if you have a PZEV car by the emissions label located under the hood. However, to absolutely confirm that your faulty TCM will be covered for FREE under the PZEV warranty, it is best to call the Mazda Customer Experience Center at 800-222-5500. They will ask for your VIN and confirm that your TCM is covered. Best to give them the TCM part # for a quicker response. The part # for all 2007-2009 Mazda 3s is L34T-18-9E1A (the last letter is the Revision and can be an A, B, C, D, or E. A Mazda warranty repair will require you to go to the Mazda dealer for the diagnosis and repair. You will have to pay for the initial diagnosis fee, but it will be waived if the TCM is determined to be faulty. So, if you have a PZEV-certified Mazda and you have determined that your TCM is faulty and you are in 1 of the 9 states noted above, you might want to have Mazda replace it for FREE vs. you buying a new one for $500+. Note the PZEV 15-yr/150k mile warranty applies to most all emission-related parts so be sure and check before spending your own $$ and DIY'ing any of these related parts. Thank you so much "Theg" for posting this. |
AT light issue
I have a 2012 Mazda 3i sport. A couple months ago I was having issues with the AT light and shifting. I had the TCM replaced and didn’t have issues up until now. I was on 840 and suddenly the AT light came on and my car started shifting. I pulled over and turned the car off. Turned back on and the light was gone. Started driving and it did it again. I checked the tcm and fluid and it seemed fine. I had the battery reset and it hasn’t done anything since, about a week. I’m just scared to drive my car at this point.
Edit |
Had same problem 4 years after get my car found a great transmission shop in the area they rebuild trans. over 6 months 6,000 dollar car & 3,000 dollar after repairs great car now.
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2006 Mazda 3 2.3L auto with U0101 code - check engine light and AT light on. 217K KM's or ~132K miles.
Called my local shop and they're $1,100 new–1/3 cost of the car! Local (Vancouver BC) shop are charging a considerable cost for used too - ranging from $250 to $450CDN. Unsure if it's worthwhile to get used, since it's a gamble how long it will last. Mazda's are great cars, but can be a PITA with these issues. |
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