# Resetting the TCM

**URL:** <https://community.cartalk.com/t/resetting-the-tcm/59349>\
**Category:** Maintenance/Repairs\
**Tags:** hyundai, sonata\
**Created:** [December 31, 2010, 7:07pm UTC](https://community.cartalk.com/t/resetting-the-tcm/59349 "2010-12-31T19:07:41Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![papaadam](https://avatars.discourse-cdn.com/v4/letter/p/c5a1d2/32.png) [@papaadam](https://community.cartalk.com/u/papaadam)\
**Post date:** [December 31, 2010, 7:07pm UTC](https://community.cartalk.com/t/resetting-the-tcm/59349/1 "2010-12-31T19:07:41Z")

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I just replaced the transmission on my 2002 hyundai sonata and the check engine light stays on; my mechanic told me to change the speed sensors and i did but the light still stays on. now i have been told to reset the transmission control module.  
  
 anybody have an idea how to reset the transmission control module?

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [December 31, 2010, 7:41pm UTC](https://community.cartalk.com/t/resetting-the-tcm/59349/2 "2010-12-31T19:41:44Z")

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I sense you feel you have “pumped” your mechanic for enough free information. Let me see if I can find anythng, have you done your own “google” search yet?

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**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\
**Post date:** [December 31, 2010, 8:43pm UTC](https://community.cartalk.com/t/resetting-the-tcm/59349/3 "2010-12-31T20:43:30Z")

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[http://www.amdmaddness.com/sonata/tsb/09-AT-002.pdf](http://www.amdmaddness.com/sonata/tsb/09-AT-002.pdf)  
Looks like you’ve got a little reading to do! Didn’t mean to step on your toes OS.

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**Author:** ![87\_Ranger](https://avatars.discourse-cdn.com/v4/letter/8/f14d63/32.png) [@87\_Ranger](https://community.cartalk.com/u/87_Ranger)\
**Post date:** [December 31, 2010, 9:34pm UTC](https://community.cartalk.com/t/resetting-the-tcm/59349/4 "2010-12-31T21:34:56Z")

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I just thumbed thru the factory shop manual for my 02 Sonata & theres no mention of resetting the TCM.

As expected, all trouble shooting flow charts are based on transmission trouble codes.

If you have the code/s, post them & i’ll see what I can find.

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [January 1, 2011, 7:59am UTC](https://community.cartalk.com/t/resetting-the-tcm/59349/5 "2011-01-01T07:59:26Z")

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Perhaps “resetting the TCM” means something to transmission specialists as I have not been asked to do this on any vehicle, but I typically stayed away from transmission work.

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [January 1, 2011, 5:26pm UTC](https://community.cartalk.com/t/resetting-the-tcm/59349/6 "2011-01-01T17:26:23Z")

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Does the car DRIVE ok?? Is the transmission (new, used, rebuilt??) shifting properly, including overdrive and torque converter lock-up? If so try disconnecting one of the battery cables for a few minutes…