# Can not get rid of code 41 **URL:** \ **Category:** GEM Forum\ **Created:** [July 15, 2019, 11:37am UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576 "2019-07-15T11:37:11Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![Bolanger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bolanger/32/4184_2.png) [@Bolanger](https://community.electricforum.com/u/Bolanger)\ **Post date:** [July 15, 2019, 11:37am UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/1 "2019-07-15T11:37:11Z")
New motor, new trans, rebuilt controller, batteries check out. Any ideas, thanks ---
**Author:** ![Bolanger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bolanger/32/4184_2.png) [@Bolanger](https://community.electricforum.com/u/Bolanger)\ **Post date:** [July 15, 2019, 11:38am UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/2 "2019-07-15T11:38:02Z")
Comes on after about 5 miles of driving ---
**Author:** ![diymatt](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/diymatt/32/1822_2.png) [@diymatt](https://community.electricforum.com/u/diymatt)\ **Post date:** [July 15, 2019, 12:35pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/3 "2019-07-15T12:35:01Z")
Something is overheating. Most likely your controller. ---
**Author:** ![grantwest](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/grantwest/32/15_2.png) [@grantwest](https://community.electricforum.com/u/grantwest)\ **Post date:** [July 15, 2019, 2:08pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/4 "2019-07-15T14:08:46Z")
Sounds like you have either a bad or old T-1 controller or your settings are to aggressive ---
**Author:** ![Bolanger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bolanger/32/4184_2.png) [@Bolanger](https://community.electricforum.com/u/Bolanger)\ **Post date:** [July 15, 2019, 4:01pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/5 "2019-07-15T16:01:46Z")
Just got the t3 controller back from flight after a rebuild. So, assume that would be ok ---
**Author:** ![grantwest](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/grantwest/32/15_2.png) [@grantwest](https://community.electricforum.com/u/grantwest)\ **Post date:** [July 15, 2019, 5:49pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/6 "2019-07-15T17:49:51Z")
T-3 sorry can’t help you most people convert to T-4 not rebuild a T-3 ---
**Author:** ![diymatt](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/diymatt/32/1822_2.png) [@diymatt](https://community.electricforum.com/u/diymatt)\ **Post date:** [July 15, 2019, 6:23pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/7 "2019-07-15T18:23:06Z")
Is the bottom of the controller raging hot? ---
**Author:** ![Bolanger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bolanger/32/4184_2.png) [@Bolanger](https://community.electricforum.com/u/Bolanger)\ **Post date:** [July 15, 2019, 6:25pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/8 "2019-07-15T18:25:35Z")
Thanks…I’ll have to get back to you on that one. I’ll take a ride in the am ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [July 15, 2019, 6:43pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/9 "2019-07-15T18:43:52Z")
Make sure you have a good thermal connection between controller and aluminum plate. Clean and tight with thermal paste. ---
**Author:** ![Bolanger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bolanger/32/4184_2.png) [@Bolanger](https://community.electricforum.com/u/Bolanger)\ **Post date:** [July 16, 2019, 2:13am UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/10 "2019-07-16T02:13:03Z")
Could you please expand a bit on the thermal break between the controller and plate…thanks ---
**Author:** ![Bolanger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bolanger/32/4184_2.png) [@Bolanger](https://community.electricforum.com/u/Bolanger)\ **Post date:** [July 16, 2019, 1:54pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/11 "2019-07-16T13:54:43Z")
Read with interest a previous thread about overheating. Looked at grants aluminum heat sink thread. Interested in where to acquire the controller heat sink ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [July 16, 2019, 2:15pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/12 "2019-07-16T14:15:04Z")
Important to have a smooth clean contact surface between controller and heat sink. Thin coating of conductive paste fills any micro voids or scratches. Keep bolts tight. A fan helps too. ---
**Author:** ![diymatt](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/diymatt/32/1822_2.png) [@diymatt](https://community.electricforum.com/u/diymatt)\ **Post date:** [July 16, 2019, 2:44pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/13 "2019-07-16T14:44:15Z")
> [@Bolanger](#): > > Interested in where to acquire the controller heat sink I was looking at ebay this morning for the same thing. [I see loads of heatsinks](https://www.ebay.com/itm/7-Lbs-Large-Industrial-Aluminum-Heat-Sink-12-5-x-6-x-2-75-8-Fin/133085603718?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D56d67df758fa4952847c12a2385cbc40%26pid%3D100675%26rk%3D11%26rkt%3D15%26sd%3D143284974745%26itm%3D133085603718%26pg%3D2481888&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3Aeca20915-a7d7-11e9-b2d6-74dbd1802c08%7Cparentrq%3Afb3c08d016b0abc068cd905cff7b1e89%7Ciid%3A1). You just need to find one that can be tweaked and modified to fit your needs. (presuming this is the solution for your needs of course) ---
**Author:** ![Bolanger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bolanger/32/4184_2.png) [@Bolanger](https://community.electricforum.com/u/Bolanger)\ **Post date:** [July 17, 2019, 4:02pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/14 "2019-07-17T16:02:51Z")
Took it out for a ride…went about 5 miles…outside temp in low 90’s. Took temp with infrared thermometer. Motor…124 Trans…104 Top controller…114 Plate at bottom of controller…126 Plate under controller is about 1/16 or 1/8 steel. Rust and paint on plate…I’ll try to strip plate use thermal paste and see what happens. Any other ideas Thanks ---
**Author:** ![LithiumGods](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/lithiumgods/32/672_2.png) [@LithiumGods](https://community.electricforum.com/u/LithiumGods)\ **Post date:** [July 18, 2019, 8:07am UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/15 "2019-07-18T08:07:37Z")
Is it happening while driving on a flat road or hilly ? what speed are you running ? Gems come from the factory with a thermal grease on the bottom of the controller . Most dont reapply when they reinstall controller and it can create an over heat problem . The reason i ask about the hills is they create a lot of heat while climbing but also create a lot of heat on decent if the gem is going too fast . The controller will go into plug braking trying to slow the Gem and it creates lots of heat . I program it out on mine . ---
**Author:** ![Bolanger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bolanger/32/4184_2.png) [@Bolanger](https://community.electricforum.com/u/Bolanger)\ **Post date:** [July 18, 2019, 4:43pm UTC](https://community.electricforum.com/t/can-not-get-rid-of-code-41/16576/16 "2019-07-18T16:43:42Z")
All driving is on level ground in South Georgia. I’ll work on cleaning up the heat sink and apply the thermostat grease and see what happens. Due to very hot summers I’m still thinking the extra finned heat sink might help Thanks