Transmission Control Module (TCM) location

2004 MAZDA 3

78,984 MILES • 2.3L • 4 CYL • 2WD • AUTOMATIC

BACKYARDBANGERS

MEMBER
1 POST

My car listed above (sedan) is having transmission problems. I have diagnosed it and the code reads that it is the TCM but I cannot locate it. I have done some research and just about everything I found tells me it is located below the battery. To my surprise it is not. So my question is. Would you happen to know where it is located?

Aug 26, 2018 at 3:37 AM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

Hello,

Your car does not have a TCM because it is interrogated into the PCM. Here is the transmission wiring diagrams so you can see for yourself and the location of the PCM. Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

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Professional Diagram for 2CarPros Members
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Aug 27, 2018 at 11:47 AM

PETE89

MEMBER
1 POST

So how do i fix the problem?

Jun 5, 2019 at 8:24 AM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

Lets run the codes first to see what the poster is talking about. here is a guide:

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

Please run down this guide and report back.

Jun 5, 2019 at 4:34 PM