TCM location

RAUSCH87

MEMBER
2007 MAZDA 3
2.0L
4 CYL
2WD
AUTOMATIC
152,459 MILES

Vehicle listed above is a sedan. I have been having transmission issues, very delayed shifts and hard shifting when placed in reverse. I have drained the transmission fluid and was very little flakes on the magnet. It has displayed different codes, once for solenoid A, then solenoid c. I was looking for the TCM to replace, but after in-depth searching, I didn't not find it. If there is one I would love to know where it is, or is it integrated with the PCM located on the battery box. If so will changing the PCM do me any good?

Saturday, July 25th, 2020 AT 2:20 PM

3 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

Yes, your vehicle does have a TCM- transmission control module. I've attached a picture below of its location for your Mazda 3. Hope this helps and thanks for using 2CarPros.

Image (Click to make bigger)

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Saturday, July 25th, 2020 AT 3:51 PM

ASEMASTER6371

MECHANIC
52,796 POSTS

Good afternoon,

I would not consider the module until you find the issue. The fact you had metal in the fluid tells me something is coming apart in the transmission and there is metal in the valve body.

https://www.2carpros.com/articles/automatic-transmission-problems

Can you give me the code numbers that you found so I can look at a flow chart for you?

Roy

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Saturday, July 25th, 2020 AT 4:03 PM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

I would definitely not consider changing the PCM at this point. Also, before changing the TCM you might want to see if there are transmission codes stored in your vehicles computer.If you don't have access to a scanner or code reader most auto parts stores have a tool loaner program and can rent you one.Just be sure the unit has automatic transmission code reading ability. Some auto parts stores like AutoZone will check codes for free. Here is a tutorial showing what is involved:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

After performing this get back to us with the code numbers if any and we can help properly diagnose.Hope this helps and thanks again for using 2CarPros.

Danny-

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Monday, July 27th, 2020 AT 4:16 PM