U0101 - Mazda3 Forums : The #1 Mazda 3 Forum
 
LinkBack Thread Tools
post #1 of 4 (permalink) Old 05-28-2019, 10:15 AM Thread Starter
Go-Kart Driver
 
Join Date: Jan 2009
Posts: 93
U0101

Hello,

I have a 2008 Mazda 3 Automatic transmission with about 135,000 miles on it. I got the U0101 code on my car after trying to leave my house the other day. I didn't really drive the car, but when parked and shifting into Drive or Reverse, it is pretty jarring and makes a loud banging sound.

I looked around here on the forums and most people with this code swap out the TCM and it seems like they get the issue fixed. Is there anything I should look at or check out before I shell out all the dough for a new TCM?

Thanks for any info!

-Andrew
misfitbum is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 05-29-2019, 08:36 AM
Short Track Racer
 
Join Date: Jun 2015
Posts: 240
I'd always do the simple and easy testing, before hanging on parts. First do a static and running test on the battery, to make sure those readings are somewhere around 12.5/13.5 volts. Then remove the TCM connector and examine both sides for corrosion or other issues, and check the wiring going into the connector as well. Reconnect the TCM and see if anything changed. If not, then disconnect the battery, touch the battery connectors together to drain the caps, and then reconnect and see if the problem goes away (even for only a short time).

2011 3i 2.0 A/T 145K miles
m3iguy is offline  
post #3 of 4 (permalink) Old 05-31-2019, 10:50 AM Thread Starter
Go-Kart Driver
 
Join Date: Jan 2009
Posts: 93
Quote:
Originally Posted by m3iguy View Post
I'd always do the simple and easy testing, before hanging on parts. First do a static and running test on the battery, to make sure those readings are somewhere around 12.5/13.5 volts. Then remove the TCM connector and examine both sides for corrosion or other issues, and check the wiring going into the connector as well. Reconnect the TCM and see if anything changed. If not, then disconnect the battery, touch the battery connectors together to drain the caps, and then reconnect and see if the problem goes away (even for only a short time).

Took everything apart, fuses and wiring look fine. Battery also tested good.

I went ahead and ordered a TCM. It should be here today, so this weekend I'll be able slap the new one on there. Fingers crossed it fixes the issue.

I'll report back once I find out. Thanks!
misfitbum is offline  
Sponsored Links
Advertisement
 
post #4 of 4 (permalink) Old 06-04-2019, 05:48 PM Thread Starter
Go-Kart Driver
 
Join Date: Jan 2009
Posts: 93
The new TCM that I installed, fixed all the issues I was having.

My 3 is back to driving normally.


Glad I got it fixed!
misfitbum is offline  
Sponsored Links
Advertisement
 
Reply

  Mazda3 Forums : The #1 Mazda 3 Forum > Technical / Model / Performance > Powertrain 2004-2009 Mazda3

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mazda3 Forums : The #1 Mazda 3 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
8