Comments on: PCM vs ECM vs ECU vs TCM (What’s the Difference?) https://cartreatments.com/pcm-vs-ecm-ecu-tcm/ Car Maintenance, General Repair, Troubleshooting, and Everything Car Related Fri, 05 Aug 2022 16:42:23 +0000 hourly 1 https://wordpress.org/?v=6.1.1 By: Sean https://cartreatments.com/pcm-vs-ecm-ecu-tcm/comment-page-1/#comment-1253462 Mon, 25 Jul 2022 15:40:13 +0000 http://cartreatments.com/?p=504859#comment-1253462 In reply to Harvey.

Grab a factory service manual. It will have all the information you are looking for.

]]> By: Harvey https://cartreatments.com/pcm-vs-ecm-ecu-tcm/comment-page-1/#comment-1252426 Thu, 21 Jul 2022 18:26:07 +0000 http://cartreatments.com/?p=504859#comment-1252426 My vehicle is a 2003 BMW 745 li, and the problem is it will not start!! I’m get error messages that the TCM is malfunctioning. I’m trying to figure out where the TCM is located. Is it in the transmission or not? And how do I test it before ordering a new one?
Thanks

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