# \-15 code Comes up Intermittently Help!

**URL:** <https://community.electricforum.com/t/15-code-comes-up-intermittently-help/19002>\
**Category:** GEM Forum\
**Created:** [June 10, 2020, 9:46pm UTC](https://community.electricforum.com/t/15-code-comes-up-intermittently-help/19002 "2020-06-10T21:46:36Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Hespeler](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/hespeler/32/6703_2.png) [@Hespeler](https://community.electricforum.com/u/Hespeler)\
**Post date:** [June 10, 2020, 9:46pm UTC](https://community.electricforum.com/t/15-code-comes-up-intermittently-help/19002/1 "2020-06-10T21:46:36Z")

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Hello I have a Gem E825 new trojan batteries . It just started coming up with fault code -15 . It will run fine you can drive it around stop and then press pedal to go and nothing code comes up -15 … why is it doing this ?  
I also noticed that some times on charge one of the rear tail lights will glow a lilttle.  
Any help would be great !!!  
Thanks Carl

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**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:** [June 10, 2020, 10:26pm UTC](https://community.electricforum.com/t/15-code-comes-up-intermittently-help/19002/2 "2020-06-10T22:26:34Z")

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-15 is low battery…

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<div class="post-metadata">

**Author:** ![Hespeler](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/hespeler/32/6703_2.png) [@Hespeler](https://community.electricforum.com/u/Hespeler)\
**Post date:** [June 10, 2020, 10:37pm UTC](https://community.electricforum.com/t/15-code-comes-up-intermittently-help/19002/3 "2020-06-10T22:37:12Z")

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It will do it after a full charge .  
it will run fine , you can stop for ten minutes and the go to go and code will pop up.  
leave it for a bit and it will be fine again .

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**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:** [June 10, 2020, 10:39pm UTC](https://community.electricforum.com/t/15-code-comes-up-intermittently-help/19002/4 "2020-06-10T22:39:41Z")

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Monitor the voltage at controller.  
A bad connection will be warm after a hard run.

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<div class="post-metadata">

**Author:** ![Hespeler](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/hespeler/32/6703_2.png) [@Hespeler](https://community.electricforum.com/u/Hespeler)\
**Post date:** [June 10, 2020, 10:44pm UTC](https://community.electricforum.com/t/15-code-comes-up-intermittently-help/19002/5 "2020-06-10T22:44:21Z")

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I suspect bad connection or bad ground somewhere as one of the tail lights glows very dull when it is on charge. Also. I noticed when lights are on one headlight is brighter than the other.