Code U0101

Tiny
JCOLE302
  • MEMBER
  • 2010 MAZDA 3
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
Have a code U0101 which points to the TCM Being bad. I’ve been told on this model with a 2.0 the ECU does the job of a TCM. Does my car have a separate TCM?
Wednesday, March 30th, 2022 AT 10:26 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This code is just pointing you to a TCM due to it not communicating on the bus network.

So that could be a module or a wiring issue, so I am attaching the info about this code and system.

The TCM is located on the driver side of the engine compartment.

Here is a guide that will talk about this type of communication network:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Please see all the info attached and let us know what questions you have.

Thanks
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Thursday, March 31st, 2022 AT 3:56 PM

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